Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev
  debugfs: Modify default debugfs directory for debugging pktcdvd.
  debugfs: Modified default dir of debugfs for debugging UHCI.
  debugfs: Change debugfs directory of IWMC3200
  debugfs: Change debuhgfs directory of trace-events-sample.h
  debugfs: Fix mount directory of debugfs by default in events.txt
  hpilo: add poll f_op
  hpilo: add interrupt handler
  hpilo: staging for interrupt handling
  driver core: platform_device_add_data(): use kmemdup()
  Driver core: Add support for compatibility classes
  uio: add generic driver for PCI 2.3 devices
  driver-core: move dma-coherent.c from kernel to driver/base
  mem_class: fix bug
  mem_class: use minor as index instead of searching the array
  driver model: constify attribute groups
  UIO: remove 'default n' from Kconfig
  Driver core: Add accessor for device platform data
  Driver core: move dev_get/set_drvdata to drivers/base/dd.c
  Driver core: add new device to bus's list before probing

41 files changed, 1232 insertions, 195 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 8f006f96ff5..ee377270beb 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -8,6 +8,31 @@ config UEVENT_HELPER_PATH
 	  Path to uevent helper program forked by the kernel for
 	  every uevent.
 
+config DEVTMPFS
+	bool "Create a kernel maintained /dev tmpfs (EXPERIMENTAL)"
+	depends on HOTPLUG && SHMEM && TMPFS
+	help
+	  This creates a tmpfs filesystem, and mounts it at bootup
+	  and mounts it at /dev. The kernel driver core creates device
+	  nodes for all registered devices in that filesystem. All device
+	  nodes are owned by root and have the default mode of 0600.
+	  Userspace can add and delete the nodes as needed. This is
+	  intended to simplify bootup, and make it possible to delay
+	  the initial coldplug at bootup done by udev in userspace.
+	  It should also provide a simpler way for rescue systems
+	  to bring up a kernel with dynamic major/minor numbers.
+	  Meaningful symlinks, permissions and device ownership must
+	  still be handled by userspace.
+	  If unsure, say N here.
+
+config DEVTMPFS_MOUNT
+	bool "Automount devtmpfs at /dev"
+	depends on DEVTMPFS
+	help
+	  This will mount devtmpfs at /dev if the kernel mounts the root
+	  filesystem. It will not affect initramfs based mounting.
+	  If unsure, say N here.
+
 config STANDALONE
 	bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL
 	default y
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index b5b8ba512b2..c12c7f2f2a6 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -4,8 +4,10 @@ obj-y			:= core.o sys.o bus.o dd.o \
 			   driver.o class.o platform.o \
 			   cpu.o firmware.o init.o map.o devres.o \
 			   attribute_container.o transport_class.o
+obj-$(CONFIG_DEVTMPFS)	+= devtmpfs.o
 obj-y			+= power/
 obj-$(CONFIG_HAS_DMA)	+= dma-mapping.o
+obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_ISA)	+= isa.o
 obj-$(CONFIG_FW_LOADER)	+= firmware_class.o
 obj-$(CONFIG_NUMA)	+= node.o
diff --git a/drivers/base/base.h b/drivers/base/base.h
index b528145a078..2ca7f5b7b82 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -70,6 +70,8 @@ struct class_private {
  * @knode_parent - node in sibling list
  * @knode_driver - node in driver list
  * @knode_bus - node in bus list
+ * @driver_data - private pointer for driver specific info.  Will turn into a
+ * list soon.
  * @device - pointer back to the struct class that this structure is
  * associated with.
  *
@@ -80,6 +82,7 @@ struct device_private {
 	struct klist_node knode_parent;
 	struct klist_node knode_driver;
 	struct klist_node knode_bus;
+	void *driver_data;
 	struct device *device;
 };
 #define to_device_private_parent(obj)	\
@@ -89,6 +92,8 @@ struct device_private {
 #define to_device_private_bus(obj)	\
 	container_of(obj, struct device_private, knode_bus)
 
+extern int device_private_init(struct device *dev);
+
 /* initialisation functions */
 extern int devices_init(void);
 extern int buses_init(void);
@@ -104,7 +109,7 @@ extern int system_bus_init(void);
 extern int cpu_dev_init(void);
 
 extern int bus_add_device(struct device *dev);
-extern void bus_attach_device(struct device *dev);
+extern void bus_probe_device(struct device *dev);
 extern void bus_remove_device(struct device *dev);
 
 extern int bus_add_driver(struct device_driver *drv);
@@ -134,3 +139,9 @@ static inline void module_add_driver(struct module *mod,
 				     struct device_driver *drv) { }
 static inline void module_remove_driver(struct device_driver *drv) { }
 #endif
+
+#ifdef CONFIG_DEVTMPFS
+extern int devtmpfs_init(void);
+#else
+static inline int devtmpfs_init(void) { return 0; }
+#endif
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 4b04a15146d..973bf2ad4e0 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -459,8 +459,9 @@ static inline void remove_deprecated_bus_links(struct device *dev) { }
  * bus_add_device - add device to bus
  * @dev: device being added
  *
+ * - Add device's bus attributes.
+ * - Create links to device's bus.
  * - Add the device to its bus's list of devices.
- * - Create link to device's bus.
  */
 int bus_add_device(struct device *dev)
 {
@@ -483,6 +484,7 @@ int bus_add_device(struct device *dev)
 		error = make_deprecated_bus_links(dev);
 		if (error)
 			goto out_deprecated;
+		klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices);
 	}
 	return 0;
 
@@ -498,24 +500,19 @@ out_put:
 }
 
 /**
- * bus_attach_device - add device to bus
- * @dev: device tried to attach to a driver
+ * bus_probe_device - probe drivers for a new device
+ * @dev: device to probe
  *
- * - Add device to bus's list of devices.
- * - Try to attach to driver.
+ * - Automatically probe for a driver if the bus allows it.
  */
-void bus_attach_device(struct device *dev)
+void bus_probe_device(struct device *dev)
 {
 	struct bus_type *bus = dev->bus;
-	int ret = 0;
+	int ret;
 
-	if (bus) {
-		if (bus->p->drivers_autoprobe)
-			ret = device_attach(dev);
+	if (bus && bus->p->drivers_autoprobe) {
+		ret = device_attach(dev);
 		WARN_ON(ret < 0);
-		if (ret >= 0)
-			klist_add_tail(&dev->p->knode_bus,
-				       &bus->p->klist_devices);
 	}
 }
 
diff --git a/drivers/base/class.c b/drivers/base/class.c
index eb85e431230..161746deab4 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -488,6 +488,93 @@ void class_interface_unregister(struct class_interface *class_intf)
 	class_put(parent);
 }
 
+struct class_compat {
+	struct kobject *kobj;
+};
+
+/**
+ * class_compat_register - register a compatibility class
+ * @name: the name of the class
+ *
+ * Compatibility class are meant as a temporary user-space compatibility
+ * workaround when converting a family of class devices to a bus devices.
+ */
+struct class_compat *class_compat_register(const char *name)
+{
+	struct class_compat *cls;
+
+	cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL);
+	if (!cls)
+		return NULL;
+	cls->kobj = kobject_create_and_add(name, &class_kset->kobj);
+	if (!cls->kobj) {
+		kfree(cls);
+		return NULL;
+	}
+	return cls;
+}
+EXPORT_SYMBOL_GPL(class_compat_register);
+
+/**
+ * class_compat_unregister - unregister a compatibility class
+ * @cls: the class to unregister
+ */
+void class_compat_unregister(struct class_compat *cls)
+{
+	kobject_put(cls->kobj);
+	kfree(cls);
+}
+EXPORT_SYMBOL_GPL(class_compat_unregister);
+
+/**
+ * class_compat_create_link - create a compatibility class device link to
+ *			      a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link should be created
+ */
+int class_compat_create_link(struct class_compat *cls, struct device *dev,
+			     struct device *device_link)
+{
+	int error;
+
+	error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev));
+	if (error)
+		return error;
+
+	/*
+	 * Optionally add a "device" link (typically to the parent), as a
+	 * class device would have one and we want to provide as much
+	 * backwards compatibility as possible.
+	 */
+	if (device_link) {
+		error = sysfs_create_link(&dev->kobj, &device_link->kobj,
+					  "device");
+		if (error)
+			sysfs_remove_link(cls->kobj, dev_name(dev));
+	}
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(class_compat_create_link);
+
+/**
+ * class_compat_remove_link - remove a compatibility class device link to
+ *			      a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link was previously
+ * 		 created
+ */
+void class_compat_remove_link(struct class_compat *cls, struct device *dev,
+			      struct device *device_link)
+{
+	if (device_link)
+		sysfs_remove_link(&dev->kobj, "device");
+	sysfs_remove_link(cls->kobj, dev_name(dev));
+}
+EXPORT_SYMBOL_GPL(class_compat_remove_link);
+
 int __init classes_init(void)
 {
 	class_kset = kset_create_and_add("class", NULL, NULL);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 7ecb1938e59..390e664ec1c 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -341,7 +341,7 @@ static void device_remove_attributes(struct device *dev,
 }
 
 static int device_add_groups(struct device *dev,
-			     struct attribute_group **groups)
+			     const struct attribute_group **groups)
 {
 	int error = 0;
 	int i;
@@ -361,7 +361,7 @@ static int device_add_groups(struct device *dev,
 }
 
 static void device_remove_groups(struct device *dev,
-				 struct attribute_group **groups)
+				 const struct attribute_group **groups)
 {
 	int i;
 
@@ -843,6 +843,17 @@ static void device_remove_sys_dev_entry(struct device *dev)
 	}
 }
 
+int device_private_init(struct device *dev)
+{
+	dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
+	if (!dev->p)
+		return -ENOMEM;
+	dev->p->device = dev;
+	klist_init(&dev->p->klist_children, klist_children_get,
+		   klist_children_put);
+	return 0;
+}
+
 /**
  * device_add - add device to device hierarchy.
  * @dev: device.
@@ -868,14 +879,11 @@ int device_add(struct device *dev)
 	if (!dev)
 		goto done;
 
-	dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
 	if (!dev->p) {
-		error = -ENOMEM;
-		goto done;
+		error = device_private_init(dev);
+		if (error)
+			goto done;
 	}
-	dev->p->device = dev;
-	klist_init(&dev->p->klist_children, klist_children_get,
-		   klist_children_put);
 
 	/*
 	 * for statically allocated devices, which should all be converted
@@ -921,6 +929,8 @@ int device_add(struct device *dev)
 		error = device_create_sys_dev_entry(dev);
 		if (error)
 			goto devtattrError;
+
+		devtmpfs_create_node(dev);
 	}
 
 	error = device_add_class_symlinks(dev);
@@ -945,7 +955,7 @@ int device_add(struct device *dev)
 					     BUS_NOTIFY_ADD_DEVICE, dev);
 
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
-	bus_attach_device(dev);
+	bus_probe_device(dev);
 	if (parent)
 		klist_add_tail(&dev->p->knode_parent,
 			       &parent->p->klist_children);
@@ -1067,6 +1077,7 @@ void device_del(struct device *dev)
 	if (parent)
 		klist_del(&dev->p->knode_parent);
 	if (MAJOR(dev->devt)) {
+		devtmpfs_delete_node(dev);
 		device_remove_sys_dev_entry(dev);
 		device_remove_file(dev, &devt_attr);
 	}
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7b34b3a48f6..979d159b5cd 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -11,8 +11,8 @@
  *
  * Copyright (c) 2002-5 Patrick Mochel
  * Copyright (c) 2002-3 Open Source Development Labs
- * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
- * Copyright (c) 2007 Novell Inc.
+ * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2007-2009 Novell Inc.
  *
  * This file is released under the GPLv2
  */
@@ -391,3 +391,30 @@ void driver_detach(struct device_driver *drv)
 		put_device(dev);
 	}
 }
+
+/*
+ * These exports can't be _GPL due to .h files using this within them, and it
+ * might break something that was previously working...
+ */
+void *dev_get_drvdata(const struct device *dev)
+{
+	if (dev && dev->p)
+		return dev->p->driver_data;
+	return NULL;
+}
+EXPORT_SYMBOL(dev_get_drvdata);
+
+void dev_set_drvdata(struct device *dev, void *data)
+{
+	int error;
+
+	if (!dev)
+		return;
+	if (!dev->p) {
+		error = device_private_init(dev);
+		if (error)
+			return;
+	}
+	dev->p->driver_data = data;
+}
+EXPORT_SYMBOL(dev_set_drvdata);
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
new file mode 100644
index 00000000000..fd488ad4263
--- /dev/null
+++ b/drivers/base/devtmpfs.c
@@ -0,0 +1,367 @@
+/*
+ * devtmpfs - kernel-maintained tmpfs-based /dev
+ *
+ * Copyright (C) 2009, Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * During bootup, before any driver core device is registered,
+ * devtmpfs, a tmpfs-based filesystem is created. Every driver-core
+ * device which requests a device node, will add a node in this
+ * filesystem. The node is named after the the name of the device,
+ * or the susbsytem can provide a custom name. All devices are
+ * owned by root and have a mode of 0600.
+ */
+
+#include <linux/kernel.h>
+#include <linux/syscalls.h>
+#include <linux/mount.h>
+#include <linux/device.h>
+#include <linux/genhd.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
+#include <linux/shmem_fs.h>
+#include <linux/cred.h>
+#include <linux/init_task.h>
+
+static struct vfsmount *dev_mnt;
+
+#if defined CONFIG_DEVTMPFS_MOUNT
+static int dev_mount = 1;
+#else
+static int dev_mount;
+#endif
+
+static int __init mount_param(char *str)
+{
+	dev_mount = simple_strtoul(str, NULL, 0);
+	return 1;
+}
+__setup("devtmpfs.mount=", mount_param);
+
+static int dev_get_sb(struct file_system_type *fs_type, int flags,
+		      const char *dev_name, void *data, struct vfsmount *mnt)
+{
+	return get_sb_single(fs_type, flags, data, shmem_fill_super, mnt);
+}
+
+static struct file_system_type dev_fs_type = {
+	.name = "devtmpfs",
+	.get_sb = dev_get_sb,
+	.kill_sb = kill_litter_super,
+};
+
+#ifdef CONFIG_BLOCK
+static inline int is_blockdev(struct device *dev)
+{
+	return dev->class == &block_class;
+}
+#else
+static inline int is_blockdev(struct device *dev) { return 0; }
+#endif
+
+static int dev_mkdir(const char *name, mode_t mode)
+{
+	struct nameidata nd;
+	struct dentry *dentry;
+	int err;
+
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      name, LOOKUP_PARENT, &nd);
+	if (err)
+		return err;
+
+	dentry = lookup_create(&nd, 1);
+	if (!IS_ERR(dentry)) {
+		err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+	return err;
+}
+
+static int create_path(const char *nodepath)
+{
+	char *path;
+	struct nameidata nd;
+	int err = 0;
+
+	path = kstrdup(nodepath, GFP_KERNEL);
+	if (!path)
+		return -ENOMEM;
+
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      path, LOOKUP_PARENT, &nd);
+	if (err == 0) {
+		struct dentry *dentry;
+
+		/* create directory right away */
+		dentry = lookup_create(&nd, 1);
+		if (!IS_ERR(dentry)) {
+			err = vfs_mkdir(nd.path.dentry->d_inode,
+					dentry, 0755);
+			dput(dentry);
+		}
+		mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+		path_put(&nd.path);
+	} else if (err == -ENOENT) {
+		char *s;
+
+		/* parent directories do not exist, create them */
+		s = path;
+		while (1) {
+			s = strchr(s, '/');
+			if (!s)
+				break;
+			s[0] = '\0';
+			err = dev_mkdir(path, 0755);
+			if (err && err != -EEXIST)
+				break;
+			s[0] = '/';
+			s++;
+		}
+	}
+
+	kfree(path);
+	return err;
+}
+
+int devtmpfs_create_node(struct device *dev)
+{
+	const char *tmp = NULL;
+	const char *nodename;
+	const struct cred *curr_cred;
+	mode_t mode;
+	struct nameidata nd;
+	struct dentry *dentry;
+	int err;
+
+	if (!dev_mnt)
+		return 0;
+
+	nodename = device_get_nodename(dev, &tmp);
+	if (!nodename)
+		return -ENOMEM;
+
+	if (is_blockdev(dev))
+		mode = S_IFBLK|0600;
+	else
+		mode = S_IFCHR|0600;
+
+	curr_cred = override_creds(&init_cred);
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      nodename, LOOKUP_PARENT, &nd);
+	if (err == -ENOENT) {
+		/* create missing parent directories */
+		create_path(nodename);
+		err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+				      nodename, LOOKUP_PARENT, &nd);
+		if (err)
+			goto out;
+	}
+
+	dentry = lookup_create(&nd, 0);
+	if (!IS_ERR(dentry)) {
+		err = vfs_mknod(nd.path.dentry->d_inode,
+				dentry, mode, dev->devt);
+		/* mark as kernel created inode */
+		if (!err)
+			dentry->d_inode->i_private = &dev_mnt;
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+out:
+	kfree(tmp);
+	revert_creds(curr_cred);
+	return err;
+}
+
+static int dev_rmdir(const char *name)
+{
+	struct nameidata nd;
+	struct dentry *dentry;
+	int err;
+
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      name, LOOKUP_PARENT, &nd);
+	if (err)
+		return err;
+
+	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
+	if (!IS_ERR(dentry)) {
+		if (dentry->d_inode)
+			err = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+		else
+			err = -ENOENT;
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+	return err;
+}
+
+static int delete_path(const char *nodepath)
+{
+	const char *path;
+	int err = 0;
+
+	path = kstrdup(nodepath, GFP_KERNEL);
+	if (!path)
+		return -ENOMEM;
+
+	while (1) {
+		char *base;
+
+		base = strrchr(path, '/');
+		if (!base)
+			break;
+		base[0] = '\0';
+		err = dev_rmdir(path);
+		if (err)
+			break;
+	}
+
+	kfree(path);
+	return err;
+}
+
+static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *stat)
+{
+	/* did we create it */
+	if (inode->i_private != &dev_mnt)
+		return 0;
+
+	/* does the dev_t match */
+	if (is_blockdev(dev)) {
+		if (!S_ISBLK(stat->mode))
+			return 0;
+	} else {
+		if (!S_ISCHR(stat->mode))
+			return 0;
+	}
+	if (stat->rdev != dev->devt)
+		return 0;
+
+	/* ours */
+	return 1;
+}
+
+int devtmpfs_delete_node(struct device *dev)
+{
+	const char *tmp = NULL;
+	const char *nodename;
+	const struct cred *curr_cred;
+	struct nameidata nd;
+	struct dentry *dentry;
+	struct kstat stat;
+	int deleted = 1;
+	int err;
+
+	if (!dev_mnt)
+		return 0;
+
+	nodename = device_get_nodename(dev, &tmp);
+	if (!nodename)
+		return -ENOMEM;
+
+	curr_cred = override_creds(&init_cred);
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      nodename, LOOKUP_PARENT, &nd);
+	if (err)
+		goto out;
+
+	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
+	if (!IS_ERR(dentry)) {
+		if (dentry->d_inode) {
+			err = vfs_getattr(nd.path.mnt, dentry, &stat);
+			if (!err && dev_mynode(dev, dentry->d_inode, &stat)) {
+				err = vfs_unlink(nd.path.dentry->d_inode,
+						 dentry);
+				if (!err || err == -ENOENT)
+					deleted = 1;
+			}
+		} else {
+			err = -ENOENT;
+		}
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+	if (deleted && strchr(nodename, '/'))
+		delete_path(nodename);
+out:
+	kfree(tmp);
+	revert_creds(curr_cred);
+	return err;
+}
+
+/*
+ * If configured, or requested by the commandline, devtmpfs will be
+ * auto-mounted after the kernel mounted the root filesystem.
+ */
+int devtmpfs_mount(const char *mountpoint)
+{
+	struct path path;
+	int err;
+
+	if (!dev_mount)
+		return 0;
+
+	if (!dev_mnt)
+		return 0;
+
+	err = kern_path(mountpoint, LOOKUP_FOLLOW, &path);
+	if (err)
+		return err;
+	err = do_add_mount(dev_mnt, &path, 0, NULL);
+	if (err)
+		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
+	else
+		printk(KERN_INFO "devtmpfs: mounted\n");
+	path_put(&path);
+	return err;
+}
+
+/*
+ * Create devtmpfs instance, driver-core devices will add their device
+ * nodes here.
+ */
+int __init devtmpfs_init(void)
+{
+	int err;
+	struct vfsmount *mnt;
+
+	err = register_filesystem(&dev_fs_type);
+	if (err) {
+		printk(KERN_ERR "devtmpfs: unable to register devtmpfs "
+		       "type %i\n", err);
+		return err;
+	}
+
+	mnt = kern_mount(&dev_fs_type);
+	if (IS_ERR(mnt)) {
+		err = PTR_ERR(mnt);
+		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);
+		unregister_filesystem(&dev_fs_type);
+		return err;
+	}
+	dev_mnt = mnt;
+
+	printk(KERN_INFO "devtmpfs: initialized\n");
+	return 0;
+}
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
new file mode 100644
index 00000000000..962a3b574f2
--- /dev/null
+++ b/drivers/base/dma-coherent.c
@@ -0,0 +1,176 @@
+/*
+ * Coherent per-device memory handling.
+ * Borrowed from i386
+ */
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+
+struct dma_coherent_mem {
+	void		*virt_base;
+	u32		device_base;
+	int		size;
+	int		flags;
+	unsigned long	*bitmap;
+};
+
+int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
+				dma_addr_t device_addr, size_t size, int flags)
+{
+	void __iomem *mem_base = NULL;
+	int pages = size >> PAGE_SHIFT;
+	int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
+
+	if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
+		goto out;
+	if (!size)
+		goto out;
+	if (dev->dma_mem)
+		goto out;
+
+	/* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
+
+	mem_base = ioremap(bus_addr, size);
+	if (!mem_base)
+		goto out;
+
+	dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
+	if (!dev->dma_mem)
+		goto out;
+	dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
+	if (!dev->dma_mem->bitmap)
+		goto free1_out;
+
+	dev->dma_mem->virt_base = mem_base;
+	dev->dma_mem->device_base = device_addr;
+	dev->dma_mem->size = pages;
+	dev->dma_mem->flags = flags;
+
+	if (flags & DMA_MEMORY_MAP)
+		return DMA_MEMORY_MAP;
+
+	return DMA_MEMORY_IO;
+
+ free1_out:
+	kfree(dev->dma_mem);
+ out:
+	if (mem_base)
+		iounmap(mem_base);
+	return 0;
+}
+EXPORT_SYMBOL(dma_declare_coherent_memory);
+
+void dma_release_declared_memory(struct device *dev)
+{
+	struct dma_coherent_mem *mem = dev->dma_mem;
+
+	if (!mem)
+		return;
+	dev->dma_mem = NULL;
+	iounmap(mem->virt_base);
+	kfree(mem->bitmap);
+	kfree(mem);
+}
+EXPORT_SYMBOL(dma_release_declared_memory);
+
+void *dma_mark_declared_memory_occupied(struct device *dev,
+					dma_addr_t device_addr, size_t size)
+{
+	struct dma_coherent_mem *mem = dev->dma_mem;
+	int pos, err;
+
+	size += device_addr & ~PAGE_MASK;
+
+	if (!mem)
+		return ERR_PTR(-EINVAL);
+
+	pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
+	err = bitmap_allocate_region(mem->bitmap, pos, get_order(size));
+	if (err != 0)
+		return ERR_PTR(err);
+	return mem->virt_base + (pos << PAGE_SHIFT);
+}
+EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
+
+/**
+ * dma_alloc_from_coherent() - try to allocate memory from the per-device coherent area
+ *
+ * @dev:	device from which we allocate memory
+ * @size:	size of requested memory area
+ * @dma_handle:	This will be filled with the correct dma handle
+ * @ret:	This pointer will be filled with the virtual address
+ *		to allocated area.
+ *
+ * This function should be only called from per-arch dma_alloc_coherent()
+ * to support allocation from per-device coherent memory pools.
+ *
+ * Returns 0 if dma_alloc_coherent should continue with allocating from
+ * generic memory areas, or !0 if dma_alloc_coherent should return @ret.
+ */
+int dma_alloc_from_coherent(struct device *dev, ssize_t size,
+				       dma_addr_t *dma_handle, void **ret)
+{
+	struct dma_coherent_mem *mem;
+	int order = get_order(size);
+	int pageno;
+
+	if (!dev)
+		return 0;
+	mem = dev->dma_mem;
+	if (!mem)
+		return 0;
+
+	*ret = NULL;
+
+	if (unlikely(size > (mem->size << PAGE_SHIFT)))
+		goto err;
+
+	pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
+	if (unlikely(pageno < 0))
+		goto err;
+
+	/*
+	 * Memory was found in the per-device area.
+	 */
+	*dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
+	*ret = mem->virt_base + (pageno << PAGE_SHIFT);
+	memset(*ret, 0, size);
+
+	return 1;
+
+err:
+	/*
+	 * In the case where the allocation can not be satisfied from the
+	 * per-device area, try to fall back to generic memory if the
+	 * constraints allow it.
+	 */
+	return mem->flags & DMA_MEMORY_EXCLUSIVE;
+}
+EXPORT_SYMBOL(dma_alloc_from_coherent);
+
+/**
+ * dma_release_from_coherent() - try to free the memory allocated from per-device coherent memory pool
+ * @dev:	device from which the memory was allocated
+ * @order:	the order of pages allocated
+ * @vaddr:	virtual address of allocated pages
+ *
+ * This checks whether the memory was allocated from the per-device
+ * coherent memory pool and if so, releases that memory.
+ *
+ * Returns 1 if we correctly released the memory, or 0 if
+ * dma_release_coherent() should proceed with releasing memory from
+ * generic pools.
+ */
+int dma_release_from_coherent(struct device *dev, int order, void *vaddr)
+{
+	struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
+
+	if (mem && vaddr >= mem->virt_base && vaddr <
+		   (mem->virt_base + (mem->size << PAGE_SHIFT))) {
+		int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
+
+		bitmap_release_region(mem->bitmap, page, order);
+		return 1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(dma_release_from_coherent);
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 8ae0f63602e..ed2ebd3c287 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -181,7 +181,7 @@ void put_driver(struct device_driver *drv)
 EXPORT_SYMBOL_GPL(put_driver);
 
 static int driver_add_groups(struct device_driver *drv,
-			     struct attribute_group **groups)
+			     const struct attribute_group **groups)
 {
 	int error = 0;
 	int i;
@@ -201,7 +201,7 @@ static int driver_add_groups(struct device_driver *drv,
 }
 
 static void driver_remove_groups(struct device_driver *drv,
-				 struct attribute_group **groups)
+				 const struct attribute_group **groups)
 {
 	int i;
 
diff --git a/drivers/base/init.c b/drivers/base/init.c
index 7bd9b6a5b01..c8a934e7942 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -20,6 +20,7 @@
 void __init driver_init(void)
 {
 	/* These are the core pieces */
+	devtmpfs_init();
 	devices_init();
 	buses_init();
 	classes_init();
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0f7d434ce98..ed156a13aa4 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -10,6 +10,7 @@
  * information.
  */
 
+#include <linux/string.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -213,14 +214,13 @@ EXPORT_SYMBOL_GPL(platform_device_add_resources);
 int platform_device_add_data(struct platform_device *pdev, const void *data,
 			     size_t size)
 {
-	void *d;
+	void *d = kmemdup(data, size, GFP_KERNEL);
 
-	d = kmalloc(size, GFP_KERNEL);
 	if (d) {
-		memcpy(d, data, size);
 		pdev->dev.platform_data = d;
+		return 0;
 	}
-	return d ? 0 : -ENOMEM;
+	return -ENOMEM;
 }
 EXPORT_SYMBOL_GPL(platform_device_add_data);
 
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 0589dfbbd7d..d8372b43282 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -572,7 +572,7 @@ static struct attribute_group cciss_dev_attr_group = {
 	.attrs = cciss_dev_attrs,
 };
 
-static struct attribute_group *cciss_dev_attr_groups[] = {
+static const struct attribute_group *cciss_dev_attr_groups[] = {
 	&cciss_dev_attr_group,
 	NULL
 };
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 99a506f619b..95f11cdef20 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -92,7 +92,7 @@ static struct mutex ctl_mutex;	/* Serialize open/close/setup/teardown */
 static mempool_t *psd_pool;
 
 static struct class	*class_pktcdvd = NULL;    /* /sys/class/pktcdvd */
-static struct dentry	*pkt_debugfs_root = NULL; /* /debug/pktcdvd */
+static struct dentry	*pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
 
 /* forward declaration */
 static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 645237bda68..0491cdf63f2 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -864,71 +864,67 @@ static const struct file_operations kmsg_fops = {
 	.write =	kmsg_write,
 };
 
-static const struct {
-	unsigned int		minor;
-	char			*name;
-	umode_t			mode;
-	const struct file_operations	*fops;
-	struct backing_dev_info	*dev_info;
-} devlist[] = { /* list of minor devices */
-	{1, "mem",     S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops,
-		&directly_mappable_cdev_bdi},
+static const struct memdev {
+	const char *name;
+	const struct file_operations *fops;
+	struct backing_dev_info *dev_info;
+} devlist[] = {
+	[ 1] = { "mem", &mem_fops, &directly_mappable_cdev_bdi },
 #ifdef CONFIG_DEVKMEM
-	{2, "kmem",    S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops,
-		&directly_mappable_cdev_bdi},
+	[ 2] = { "kmem", &kmem_fops, &directly_mappable_cdev_bdi },
 #endif
-	{3, "null",    S_IRUGO | S_IWUGO,           &null_fops, NULL},
+	[ 3] = {"null", &null_fops, NULL },
 #ifdef CONFIG_DEVPORT
-	{4, "port",    S_IRUSR | S_IWUSR | S_IRGRP, &port_fops, NULL},
+	[ 4] = { "port", &port_fops, NULL },
 #endif
-	{5, "zero",    S_IRUGO | S_IWUGO,           &zero_fops, &zero_bdi},
-	{7, "full",    S_IRUGO | S_IWUGO,           &full_fops, NULL},
-	{8, "random",  S_IRUGO | S_IWUSR,           &random_fops, NULL},
-	{9, "urandom", S_IRUGO | S_IWUSR,           &urandom_fops, NULL},
-	{11,"kmsg",    S_IRUGO | S_IWUSR,           &kmsg_fops, NULL},
+	[ 5] = { "zero", &zero_fops, &zero_bdi },
+	[ 7] = { "full", &full_fops, NULL },
+	[ 8] = { "random", &random_fops, NULL },
+	[ 9] = { "urandom", &urandom_fops, NULL },
+	[11] = { "kmsg", &kmsg_fops, NULL },
 #ifdef CONFIG_CRASH_DUMP
-	{12,"oldmem",    S_IRUSR | S_IWUSR | S_IRGRP, &oldmem_fops, NULL},
+	[12] = { "oldmem", &oldmem_fops, NULL },
 #endif
 };
 
 static int memory_open(struct inode *inode, struct file *filp)
 {
-	int ret = 0;
-	int i;
+	int minor;
+	const struct memdev *dev;
+	int ret = -ENXIO;
 
 	lock_kernel();
 
-	for (i = 0; i < ARRAY_SIZE(devlist); i++) {
-		if (devlist[i].minor == iminor(inode)) {
-			filp->f_op = devlist[i].fops;
-			if (devlist[i].dev_info) {
-				filp->f_mapping->backing_dev_info =
-					devlist[i].dev_info;
-			}
+	minor = iminor(inode);
+	if (minor >= ARRAY_SIZE(devlist))
+		goto out;
 
-			break;
-		}
-	}
+	dev = &devlist[minor];
+	if (!dev->fops)
+		goto out;
 
-	if (i == ARRAY_SIZE(devlist))
-		ret = -ENXIO;
-	else
-		if (filp->f_op && filp->f_op->open)
-			ret = filp->f_op->open(inode, filp);
+	filp->f_op = dev->fops;
+	if (dev->dev_info)
+		filp->f_mapping->backing_dev_info = dev->dev_info;
 
+	if (dev->fops->open)
+		ret = dev->fops->open(inode, filp);
+	else
+		ret = 0;
+out:
 	unlock_kernel();
 	return ret;
 }
 
 static const struct file_operations memory_fops = {
-	.open		= memory_open,	/* just a selector for the real open */
+	.open		= memory_open,
 };
 
 static struct class *mem_class;
 
 static int __init chr_dev_init(void)
 {
-	int i;
+	int minor;
 	int err;
 
 	err = bdi_init(&zero_bdi);
@@ -939,10 +935,12 @@ static int __init chr_dev_init(void)
 		printk("unable to get major %d for memory devs\n", MEM_MAJOR);
 
 	mem_class = class_create(THIS_MODULE, "mem");
-	for (i = 0; i < ARRAY_SIZE(devlist); i++)
-		device_create(mem_class, NULL,
-			      MKDEV(MEM_MAJOR, devlist[i].minor), NULL,
-			      devlist[i].name);
+	for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
+		if (!devlist[minor].name)
+			continue;
+		device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
+			      NULL, devlist[minor].name);
+	}
 
 	return 0;
 }
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 97e656af2d2..9d0dfcbe2c1 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -312,7 +312,7 @@ static void init_fw_attribute_group(struct device *dev,
 	group->groups[0] = &group->group;
 	group->groups[1] = NULL;
 	group->group.attrs = group->attrs;
-	dev->groups = group->groups;
+	dev->groups = (const struct attribute_group **) group->groups;
 }
 
 static ssize_t modalias_show(struct device *dev,
diff --git a/drivers/firmware/dmi-id.c b/drivers/firmware/dmi-id.c
index 5a76d056b9d..dbdf6fadfc7 100644
--- a/drivers/firmware/dmi-id.c
+++ b/drivers/firmware/dmi-id.c
@@ -139,7 +139,7 @@ static struct attribute_group sys_dmi_attribute_group = {
 	.attrs = sys_dmi_attributes,
 };
 
-static struct attribute_group* sys_dmi_attribute_groups[] = {
+static const struct attribute_group* sys_dmi_attribute_groups[] = {
 	&sys_dmi_attribute_group,
 	NULL
 };
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 5b635aa5947..fb2d83c5bf0 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -623,7 +623,7 @@ static struct attribute_group ehca_drv_attr_grp = {
 	.attrs = ehca_drv_attrs
 };
 
-static struct attribute_group *ehca_drv_attr_groups[] = {
+static const struct attribute_group *ehca_drv_attr_groups[] = {
 	&ehca_drv_attr_grp,
 	NULL,
 };
diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
index 6ba4861dd6a..b3d7efcdf02 100644
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h
@@ -1286,7 +1286,7 @@ struct device_driver;
 
 extern const char ib_ipath_version[];
 
-extern struct attribute_group *ipath_driver_attr_groups[];
+extern const struct attribute_group *ipath_driver_attr_groups[];
 
 int ipath_device_create_group(struct device *, struct ipath_devdata *);
 void ipath_device_remove_group(struct device *, struct ipath_devdata *);
diff --git a/drivers/infiniband/hw/ipath/ipath_sysfs.c b/drivers/infiniband/hw/ipath/ipath_sysfs.c
index a6c8efbdc0c..b8cb2f145ae 100644
--- a/drivers/infiniband/hw/ipath/ipath_sysfs.c
+++ b/drivers/infiniband/hw/ipath/ipath_sysfs.c
@@ -1069,7 +1069,7 @@ static ssize_t show_tempsense(struct device *dev,
 	return ret;
 }
 
-struct attribute_group *ipath_driver_attr_groups[] = {
+const struct attribute_group *ipath_driver_attr_groups[] = {
 	&driver_attr_group,
 	NULL,
 };
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 7c237e6ac71..851791d955f 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1144,7 +1144,7 @@ static struct attribute_group input_dev_caps_attr_group = {
 	.attrs	= input_dev_caps_attrs,
 };
 
-static struct attribute_group *input_dev_attr_groups[] = {
+static const struct attribute_group *input_dev_attr_groups[] = {
 	&input_dev_attr_group,
 	&input_dev_id_attr_group,
 	&input_dev_caps_attr_group,
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index 7b039306037..e9eae4a7840 100644
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -238,7 +238,7 @@ static void enclosure_component_release(struct device *dev)
 	put_device(dev->parent);
 }
 
-static struct attribute_group *enclosure_groups[];
+static const struct attribute_group *enclosure_groups[];
 
 /**
  * enclosure_component_register - add a particular component to an enclosure
@@ -536,7 +536,7 @@ static struct attribute_group enclosure_group = {
 	.attrs = enclosure_component_attrs,
 };
 
-static struct attribute_group *enclosure_groups[] = {
+static const struct attribute_group *enclosure_groups[] = {
 	&enclosure_group,
 	NULL
 };
diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index 880ccf39e23..1ad27c6abcc 100644
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/pci.h>
+#include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/device.h>
 #include <linux/file.h>
@@ -21,6 +22,8 @@
 #include <linux/delay.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
+#include <linux/wait.h>
+#include <linux/poll.h>
 #include "hpilo.h"
 
 static struct class *ilo_class;
@@ -61,9 +64,10 @@ static inline int desc_mem_sz(int nr_entry)
 static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
 {
 	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+	unsigned long flags;
 	int ret = 0;
 
-	spin_lock(&hw->fifo_lock);
+	spin_lock_irqsave(&hw->fifo_lock, flags);
 	if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
 	      & ENTRY_MASK_O)) {
 		fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
@@ -71,7 +75,7 @@ static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
 		fifo_q->tail += 1;
 		ret = 1;
 	}
-	spin_unlock(&hw->fifo_lock);
+	spin_unlock_irqrestore(&hw->fifo_lock, flags);
 
 	return ret;
 }
@@ -79,10 +83,11 @@ static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
 static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
 {
 	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+	unsigned long flags;
 	int ret = 0;
 	u64 c;
 
-	spin_lock(&hw->fifo_lock);
+	spin_lock_irqsave(&hw->fifo_lock, flags);
 	c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
 	if (c & ENTRY_MASK_C) {
 		if (entry)
@@ -93,7 +98,23 @@ static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
 		fifo_q->head += 1;
 		ret = 1;
 	}
-	spin_unlock(&hw->fifo_lock);
+	spin_unlock_irqrestore(&hw->fifo_lock, flags);
+
+	return ret;
+}
+
+static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
+{
+	struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+	unsigned long flags;
+	int ret = 0;
+	u64 c;
+
+	spin_lock_irqsave(&hw->fifo_lock, flags);
+	c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
+	if (c & ENTRY_MASK_C)
+		ret = 1;
+	spin_unlock_irqrestore(&hw->fifo_lock, flags);
 
 	return ret;
 }
@@ -142,6 +163,13 @@ static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
 	return ret;
 }
 
+static int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb)
+{
+	char *fifobar = ccb->ccb_u3.recv_fifobar;
+
+	return fifo_check_recv(hw, fifobar);
+}
+
 static inline void doorbell_set(struct ccb *ccb)
 {
 	iowrite8(1, ccb->ccb_u5.db_base);
@@ -151,6 +179,7 @@ static inline void doorbell_clr(struct ccb *ccb)
 {
 	iowrite8(2, ccb->ccb_u5.db_base);
 }
+
 static inline int ctrl_set(int l2sz, int idxmask, int desclim)
 {
 	int active = 0, go = 1;
@@ -160,6 +189,7 @@ static inline int ctrl_set(int l2sz, int idxmask, int desclim)
 	       active << CTRL_BITPOS_A |
 	       go << CTRL_BITPOS_G;
 }
+
 static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
 {
 	/* for simplicity, use the same parameters for send and recv ctrls */
@@ -192,13 +222,10 @@ static void fifo_setup(void *base_addr, int nr_entry)
 
 static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
 {
-	struct ccb *driver_ccb;
-	struct ccb __iomem *device_ccb;
+	struct ccb *driver_ccb = &data->driver_ccb;
+	struct ccb __iomem *device_ccb = data->mapped_ccb;
 	int retries;
 
-	driver_ccb = &data->driver_ccb;
-	device_ccb = data->mapped_ccb;
-
 	/* complicated dance to tell the hw we are stopping */
 	doorbell_clr(driver_ccb);
 	iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
@@ -225,26 +252,22 @@ static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
 	pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
 }
 
-static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
+static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 {
 	char *dma_va, *dma_pa;
-	int pkt_id, pkt_sz, i, error;
 	struct ccb *driver_ccb, *ilo_ccb;
-	struct pci_dev *pdev;
 
 	driver_ccb = &data->driver_ccb;
 	ilo_ccb = &data->ilo_ccb;
-	pdev = hw->ilo_dev;
 
 	data->dma_size = 2 * fifo_sz(NR_QENTRY) +
 			 2 * desc_mem_sz(NR_QENTRY) +
 			 ILO_START_ALIGN + ILO_CACHE_SZ;
 
-	error = -ENOMEM;
-	data->dma_va = pci_alloc_consistent(pdev, data->dma_size,
+	data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size,
 					    &data->dma_pa);
 	if (!data->dma_va)
-		goto out;
+		return -ENOMEM;
 
 	dma_va = (char *)data->dma_va;
 	dma_pa = (char *)data->dma_pa;
@@ -290,10 +313,18 @@ static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 	driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
 	ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
 
+	return 0;
+}
+
+static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
+{
+	int pkt_id, pkt_sz;
+	struct ccb *driver_ccb = &data->driver_ccb;
+
 	/* copy the ccb with physical addrs to device memory */
 	data->mapped_ccb = (struct ccb __iomem *)
 				(hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
-	memcpy_toio(data->mapped_ccb, ilo_ccb, sizeof(struct ccb));
+	memcpy_toio(data->mapped_ccb, &data->ilo_ccb, sizeof(struct ccb));
 
 	/* put packets on the send and receive queues */
 	pkt_sz = 0;
@@ -306,7 +337,14 @@ static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 	for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
 		ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
 
+	/* the ccb is ready to use */
 	doorbell_clr(driver_ccb);
+}
+
+static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
+{
+	int pkt_id, i;
+	struct ccb *driver_ccb = &data->driver_ccb;
 
 	/* make sure iLO is really handling requests */
 	for (i = MAX_WAIT; i > 0; i--) {
@@ -315,20 +353,14 @@ static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 		udelay(WAIT_TIME);
 	}
 
-	if (i) {
-		ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
-		doorbell_set(driver_ccb);
-	} else {
-		dev_err(&pdev->dev, "Open could not dequeue a packet\n");
-		error = -EBUSY;
-		goto free;
+	if (i == 0) {
+		dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
+		return -EBUSY;
 	}
 
+	ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
+	doorbell_set(driver_ccb);
 	return 0;
-free:
-	ilo_ccb_close(pdev, data);
-out:
-	return error;
 }
 
 static inline int is_channel_reset(struct ccb *ccb)
@@ -343,19 +375,45 @@ static inline void set_channel_reset(struct ccb *ccb)
 	FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
 }
 
+static inline int get_device_outbound(struct ilo_hwinfo *hw)
+{
+	return ioread32(&hw->mmio_vaddr[DB_OUT]);
+}
+
+static inline int is_db_reset(int db_out)
+{
+	return db_out & (1 << DB_RESET);
+}
+
 static inline int is_device_reset(struct ilo_hwinfo *hw)
 {
 	/* check for global reset condition */
-	return ioread32(&hw->mmio_vaddr[DB_OUT]) & (1 << DB_RESET);
+	return is_db_reset(get_device_outbound(hw));
+}
+
+static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr)
+{
+	iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);
 }
 
 static inline void clear_device(struct ilo_hwinfo *hw)
 {
 	/* clear the device (reset bits, pending channel entries) */
-	iowrite32(-1, &hw->mmio_vaddr[DB_OUT]);
+	clear_pending_db(hw, -1);
+}
+
+static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
+{
+	iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
 }
 
-static void ilo_locked_reset(struct ilo_hwinfo *hw)
+static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
+{
+	iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
+		 &hw->mmio_vaddr[DB_IRQ]);
+}
+
+static void ilo_set_reset(struct ilo_hwinfo *hw)
 {
 	int slot;
 
@@ -368,40 +426,22 @@ static void ilo_locked_reset(struct ilo_hwinfo *hw)
 			continue;
 		set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
 	}
-
-	clear_device(hw);
-}
-
-static void ilo_reset(struct ilo_hwinfo *hw)
-{
-	spin_lock(&hw->alloc_lock);
-
-	/* reset might have been handled after lock was taken */
-	if (is_device_reset(hw))
-		ilo_locked_reset(hw);
-
-	spin_unlock(&hw->alloc_lock);
 }
 
 static ssize_t ilo_read(struct file *fp, char __user *buf,
 			size_t len, loff_t *off)
 {
 	int err, found, cnt, pkt_id, pkt_len;
-	struct ccb_data *data;
-	struct ccb *driver_ccb;
-	struct ilo_hwinfo *hw;
+	struct ccb_data *data = fp->private_data;
+	struct ccb *driver_ccb = &data->driver_ccb;
+	struct ilo_hwinfo *hw = data->ilo_hw;
 	void *pkt;
 
-	data = fp->private_data;
-	driver_ccb = &data->driver_ccb;
-	hw = data->ilo_hw;
-
-	if (is_device_reset(hw) || is_channel_reset(driver_ccb)) {
+	if (is_channel_reset(driver_ccb)) {
 		/*
 		 * If the device has been reset, applications
 		 * need to close and reopen all ccbs.
 		 */
-		ilo_reset(hw);
 		return -ENODEV;
 	}
 
@@ -442,23 +482,13 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf,
 			 size_t len, loff_t *off)
 {
 	int err, pkt_id, pkt_len;
-	struct ccb_data *data;
-	struct ccb *driver_ccb;
-	struct ilo_hwinfo *hw;
+	struct ccb_data *data = fp->private_data;
+	struct ccb *driver_ccb = &data->driver_ccb;
+	struct ilo_hwinfo *hw = data->ilo_hw;
 	void *pkt;
 
-	data = fp->private_data;
-	driver_ccb = &data->driver_ccb;
-	hw = data->ilo_hw;
-
-	if (is_device_reset(hw) || is_channel_reset(driver_ccb)) {
-		/*
-		 * If the device has been reset, applications
-		 * need to close and reopen all ccbs.
-		 */
-		ilo_reset(hw);
+	if (is_channel_reset(driver_ccb))
 		return -ENODEV;
-	}
 
 	/* get a packet to send the user command */
 	if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
@@ -480,32 +510,48 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf,
 	return err ? -EFAULT : len;
 }
 
+static unsigned int ilo_poll(struct file *fp, poll_table *wait)
+{
+	struct ccb_data *data = fp->private_data;
+	struct ccb *driver_ccb = &data->driver_ccb;
+
+	poll_wait(fp, &data->ccb_waitq, wait);
+
+	if (is_channel_reset(driver_ccb))
+		return POLLERR;
+	else if (ilo_pkt_recv(data->ilo_hw, driver_ccb))
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
 static int ilo_close(struct inode *ip, struct file *fp)
 {
 	int slot;
 	struct ccb_data *data;
 	struct ilo_hwinfo *hw;
+	unsigned long flags;
 
 	slot = iminor(ip) % MAX_CCB;
 	hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
 
-	spin_lock(&hw->alloc_lock);
-
-	if (is_device_reset(hw))
-		ilo_locked_reset(hw);
+	spin_lock(&hw->open_lock);
 
 	if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
 
 		data = fp->private_data;
 
+		spin_lock_irqsave(&hw->alloc_lock, flags);
+		hw->ccb_alloc[slot] = NULL;
+		spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
 		ilo_ccb_close(hw->ilo_dev, data);
 
 		kfree(data);
-		hw->ccb_alloc[slot] = NULL;
 	} else
 		hw->ccb_alloc[slot]->ccb_cnt--;
 
-	spin_unlock(&hw->alloc_lock);
+	spin_unlock(&hw->open_lock);
 
 	return 0;
 }
@@ -515,6 +561,7 @@ static int ilo_open(struct inode *ip, struct file *fp)
 	int slot, error;
 	struct ccb_data *data;
 	struct ilo_hwinfo *hw;
+	unsigned long flags;
 
 	slot = iminor(ip) % MAX_CCB;
 	hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
@@ -524,22 +571,42 @@ static int ilo_open(struct inode *ip, struct file *fp)
 	if (!data)
 		return -ENOMEM;
 
-	spin_lock(&hw->alloc_lock);
-
-	if (is_device_reset(hw))
-		ilo_locked_reset(hw);
+	spin_lock(&hw->open_lock);
 
 	/* each fd private_data holds sw/hw view of ccb */
 	if (hw->ccb_alloc[slot] == NULL) {
 		/* create a channel control block for this minor */
-		error = ilo_ccb_open(hw, data, slot);
-		if (!error) {
-			hw->ccb_alloc[slot] = data;
-			hw->ccb_alloc[slot]->ccb_cnt = 1;
-			hw->ccb_alloc[slot]->ccb_excl = fp->f_flags & O_EXCL;
-			hw->ccb_alloc[slot]->ilo_hw = hw;
-		} else
+		error = ilo_ccb_setup(hw, data, slot);
+		if (error) {
 			kfree(data);
+			goto out;
+		}
+
+		data->ccb_cnt = 1;
+		data->ccb_excl = fp->f_flags & O_EXCL;
+		data->ilo_hw = hw;
+		init_waitqueue_head(&data->ccb_waitq);
+
+		/* write the ccb to hw */
+		spin_lock_irqsave(&hw->alloc_lock, flags);
+		ilo_ccb_open(hw, data, slot);
+		hw->ccb_alloc[slot] = data;
+		spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
+		/* make sure the channel is functional */
+		error = ilo_ccb_verify(hw, data);
+		if (error) {
+
+			spin_lock_irqsave(&hw->alloc_lock, flags);
+			hw->ccb_alloc[slot] = NULL;
+			spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
+			ilo_ccb_close(hw->ilo_dev, data);
+
+			kfree(data);
+			goto out;
+		}
+
 	} else {
 		kfree(data);
 		if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
@@ -554,7 +621,8 @@ static int ilo_open(struct inode *ip, struct file *fp)
 			error = 0;
 		}
 	}
-	spin_unlock(&hw->alloc_lock);
+out:
+	spin_unlock(&hw->open_lock);
 
 	if (!error)
 		fp->private_data = hw->ccb_alloc[slot];
@@ -566,10 +634,46 @@ static const struct file_operations ilo_fops = {
 	.owner		= THIS_MODULE,
 	.read		= ilo_read,
 	.write		= ilo_write,
+	.poll		= ilo_poll,
 	.open 		= ilo_open,
 	.release 	= ilo_close,
 };
 
+static irqreturn_t ilo_isr(int irq, void *data)
+{
+	struct ilo_hwinfo *hw = data;
+	int pending, i;
+
+	spin_lock(&hw->alloc_lock);
+
+	/* check for ccbs which have data */
+	pending = get_device_outbound(hw);
+	if (!pending) {
+		spin_unlock(&hw->alloc_lock);
+		return IRQ_NONE;
+	}
+
+	if (is_db_reset(pending)) {
+		/* wake up all ccbs if the device was reset */
+		pending = -1;
+		ilo_set_reset(hw);
+	}
+
+	for (i = 0; i < MAX_CCB; i++) {
+		if (!hw->ccb_alloc[i])
+			continue;
+		if (pending & (1 << i))
+			wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
+	}
+
+	/* clear the device of the channels that have been handled */
+	clear_pending_db(hw, pending);
+
+	spin_unlock(&hw->alloc_lock);
+
+	return IRQ_HANDLED;
+}
+
 static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
 {
 	pci_iounmap(pdev, hw->db_vaddr);
@@ -623,6 +727,8 @@ static void ilo_remove(struct pci_dev *pdev)
 		device_destroy(ilo_class, MKDEV(ilo_major, i));
 
 	cdev_del(&ilo_hw->cdev);
+	ilo_disable_interrupts(ilo_hw);
+	free_irq(pdev->irq, ilo_hw);
 	ilo_unmap_device(pdev, ilo_hw);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
@@ -658,6 +764,7 @@ static int __devinit ilo_probe(struct pci_dev *pdev,
 	ilo_hw->ilo_dev = pdev;
 	spin_lock_init(&ilo_hw->alloc_lock);
 	spin_lock_init(&ilo_hw->fifo_lock);
+	spin_lock_init(&ilo_hw->open_lock);
 
 	error = pci_enable_device(pdev);
 	if (error)
@@ -676,13 +783,19 @@ static int __devinit ilo_probe(struct pci_dev *pdev,
 	pci_set_drvdata(pdev, ilo_hw);
 	clear_device(ilo_hw);
 
+	error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
+	if (error)
+		goto unmap;
+
+	ilo_enable_interrupts(ilo_hw);
+
 	cdev_init(&ilo_hw->cdev, &ilo_fops);
 	ilo_hw->cdev.owner = THIS_MODULE;
 	start = devnum * MAX_CCB;
 	error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
 	if (error) {
 		dev_err(&pdev->dev, "Could not add cdev\n");
-		goto unmap;
+		goto remove_isr;
 	}
 
 	for (minor = 0 ; minor < MAX_CCB; minor++) {
@@ -695,6 +808,9 @@ static int __devinit ilo_probe(struct pci_dev *pdev,
 	}
 
 	return 0;
+remove_isr:
+	ilo_disable_interrupts(ilo_hw);
+	free_irq(pdev->irq, ilo_hw);
 unmap:
 	ilo_unmap_device(pdev, ilo_hw);
 free_regions:
@@ -759,7 +875,7 @@ static void __exit ilo_exit(void)
 	class_destroy(ilo_class);
 }
 
-MODULE_VERSION("1.1");
+MODULE_VERSION("1.2");
 MODULE_ALIAS(ILO_NAME);
 MODULE_DESCRIPTION(ILO_NAME);
 MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
diff --git a/drivers/misc/hpilo.h b/drivers/misc/hpilo.h
index 03a14c82aad..38576050776 100644
--- a/drivers/misc/hpilo.h
+++ b/drivers/misc/hpilo.h
@@ -46,11 +46,14 @@ struct ilo_hwinfo {
 
 	spinlock_t alloc_lock;
 	spinlock_t fifo_lock;
+	spinlock_t open_lock;
 
 	struct cdev cdev;
 };
 
-/* offset from mmio_vaddr */
+/* offset from mmio_vaddr for enabling doorbell interrupts */
+#define DB_IRQ		0xB2
+/* offset from mmio_vaddr for outbound communications */
 #define DB_OUT		0xD4
 /* DB_OUT reset bit */
 #define DB_RESET	26
@@ -131,6 +134,9 @@ struct ccb_data {
 	/* pointer to hardware device info */
 	struct ilo_hwinfo *ilo_hw;
 
+	/* queue for this ccb to wait for recv data */
+	wait_queue_head_t ccb_waitq;
+
 	/* usage count, to allow for shared ccb's */
 	int	    ccb_cnt;
 
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 06084dbf127..2fb9d5f271e 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -276,7 +276,7 @@ static struct attribute_group mmc_std_attr_group = {
 	.attrs = mmc_std_attrs,
 };
 
-static struct attribute_group *mmc_attr_groups[] = {
+static const struct attribute_group *mmc_attr_groups[] = {
 	&mmc_std_attr_group,
 	NULL,
 };
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index cd81c395e16..7ad646fe077 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -314,7 +314,7 @@ static struct attribute_group sd_std_attr_group = {
 	.attrs = sd_std_attrs,
 };
 
-static struct attribute_group *sd_attr_groups[] = {
+static const struct attribute_group *sd_attr_groups[] = {
 	&sd_std_attr_group,
 	NULL,
 };
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 00ebf7af746..69007a6eff5 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -217,7 +217,7 @@ struct attribute_group mtd_group = {
 	.attrs		= mtd_attrs,
 };
 
-struct attribute_group *mtd_groups[] = {
+const struct attribute_group *mtd_groups[] = {
 	&mtd_group,
 	NULL,
 };
diff --git a/drivers/net/wireless/iwmc3200wifi/Kconfig b/drivers/net/wireless/iwmc3200wifi/Kconfig
index c62da435285..c25a04371ca 100644
--- a/drivers/net/wireless/iwmc3200wifi/Kconfig
+++ b/drivers/net/wireless/iwmc3200wifi/Kconfig
@@ -24,8 +24,8 @@ config IWM_DEBUG
 	  To see the list of debug modules and levels, see iwm/debug.h
 
 	  For example, if you want the full MLME debug output:
-	  echo 0xff > /debug/iwm/phyN/debug/mlme
+	  echo 0xff > /sys/kernel/debug/iwm/phyN/debug/mlme
 
 	  Or, if you want the full debug, for all modules:
-	  echo 0xff > /debug/iwm/phyN/debug/level
-	  echo 0xff > /debug/iwm/phyN/debug/modules
+	  echo 0xff > /sys/kernel/debug/iwm/phyN/debug/level
+	  echo 0xff > /sys/kernel/debug/iwm/phyN/debug/modules
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index e995123fd80..393c73c47f8 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -266,7 +266,7 @@ static struct attribute_group subch_attr_group = {
 	.attrs = subch_attrs,
 };
 
-static struct attribute_group *default_subch_attr_groups[] = {
+static const struct attribute_group *default_subch_attr_groups[] = {
 	&subch_attr_group,
 	NULL,
 };
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 0f95405c2c5..6527f3f3449 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -656,7 +656,7 @@ static struct attribute_group ccwdev_attr_group = {
 	.attrs = ccwdev_attrs,
 };
 
-static struct attribute_group *ccwdev_attr_groups[] = {
+static const struct attribute_group *ccwdev_attr_groups[] = {
 	&ccwdev_attr_group,
 	NULL,
 };
diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c
index 9215fbbccc0..a4b2c576144 100644
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -2159,7 +2159,7 @@ static struct attribute_group netiucv_drv_attr_group = {
 	.attrs = netiucv_drv_attrs,
 };
 
-static struct attribute_group *netiucv_drv_attr_groups[] = {
+static const struct attribute_group *netiucv_drv_attr_groups[] = {
 	&netiucv_drv_attr_group,
 	NULL,
 };
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 021e503c8c4..1fbf7c78bba 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -132,7 +132,7 @@ extern struct scsi_transport_template blank_transport_template;
 extern void __scsi_remove_device(struct scsi_device *);
 
 extern struct bus_type scsi_bus_type;
-extern struct attribute_group *scsi_sysfs_shost_attr_groups[];
+extern const struct attribute_group *scsi_sysfs_shost_attr_groups[];
 
 /* scsi_netlink.c */
 #ifdef CONFIG_SCSI_NETLINK
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 91482f2dcc5..fde54537d71 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -275,7 +275,7 @@ struct attribute_group scsi_shost_attr_group = {
 	.attrs =	scsi_sysfs_shost_attrs,
 };
 
-struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
+const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 	&scsi_shost_attr_group,
 	NULL
 };
@@ -745,7 +745,7 @@ static struct attribute_group scsi_sdev_attr_group = {
 	.attrs =	scsi_sdev_attrs,
 };
 
-static struct attribute_group *scsi_sdev_attr_groups[] = {
+static const struct attribute_group *scsi_sdev_attr_groups[] = {
 	&scsi_sdev_attr_group,
 	NULL
 };
diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index 7f86534de26..8aa1955f35e 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -1,7 +1,6 @@
 menuconfig UIO
 	tristate "Userspace I/O drivers"
 	depends on !S390
-	default n
 	help
 	  Enable this to allow the userspace driver core code to be
 	  built.  This code allows userspace programs easy access to
@@ -16,7 +15,6 @@ if UIO
 config UIO_CIF
 	tristate "generic Hilscher CIF Card driver"
 	depends on PCI
-	default n
 	help
 	  Driver for Hilscher CIF DeviceNet and Profibus cards.  This
 	  driver requires a userspace component that handles all of the
@@ -48,7 +46,6 @@ config UIO_PDRV_GENIRQ
 
 config UIO_SMX
 	tristate "SMX cryptengine UIO interface"
-	default n
 	help
 	  Userspace IO interface to the Cryptography engine found on the
 	  Nias Digital SMX boards.  These will be available from Q4 2008
@@ -61,7 +58,6 @@ config UIO_SMX
 config UIO_AEC
 	tristate "AEC video timestamp device"
 	depends on PCI
-	default n
 	help
 
 	  UIO driver for the Adrienne Electronics Corporation PCI time
@@ -78,7 +74,6 @@ config UIO_AEC
 
 config UIO_SERCOS3
 	tristate "Automata Sercos III PCI card driver"
-	default n
 	help
 	  Userspace I/O interface for the Sercos III PCI card from
 	  Automata GmbH. The userspace part of this driver will be
@@ -89,4 +84,14 @@ config UIO_SERCOS3
 
 	  If you compile this as a module, it will be called uio_sercos3.
 
+config UIO_PCI_GENERIC
+	tristate "Generic driver for PCI 2.3 and PCI Express cards"
+	depends on PCI
+	default n
+	help
+	  Generic driver that you can bind, dynamically, to any
+	  PCI 2.3 compliant and PCI Express card. It is useful,
+	  primarily, for virtualization scenarios.
+	  If you compile this as a module, it will be called uio_pci_generic.
+
 endif
diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
index 5c2586d7579..73b2e751672 100644
--- a/drivers/uio/Makefile
+++ b/drivers/uio/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_UIO_PDRV_GENIRQ)	+= uio_pdrv_genirq.o
 obj-$(CONFIG_UIO_SMX)	+= uio_smx.o
 obj-$(CONFIG_UIO_AEC)	+= uio_aec.o
 obj-$(CONFIG_UIO_SERCOS3)	+= uio_sercos3.o
+obj-$(CONFIG_UIO_PCI_GENERIC)	+= uio_pci_generic.o
diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
new file mode 100644
index 00000000000..313da35984a
--- /dev/null
+++ b/drivers/uio/uio_pci_generic.c
@@ -0,0 +1,207 @@
+/* uio_pci_generic - generic UIO driver for PCI 2.3 devices
+ *
+ * Copyright (C) 2009 Red Hat, Inc.
+ * Author: Michael S. Tsirkin <mst@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ *
+ * Since the driver does not declare any device ids, you must allocate
+ * id and bind the device to the driver yourself.  For example:
+ *
+ * # echo "8086 10f5" > /sys/bus/pci/drivers/uio_pci_generic/new_id
+ * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
+ * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
+ * # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
+ * .../0000:00:19.0/driver -> ../../../bus/pci/drivers/uio_pci_generic
+ *
+ * Driver won't bind to devices which do not support the Interrupt Disable Bit
+ * in the command register. All devices compliant to PCI 2.3 (circa 2002) and
+ * all compliant PCI Express devices should support this bit.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/uio_driver.h>
+#include <linux/spinlock.h>
+
+#define DRIVER_VERSION	"0.01.0"
+#define DRIVER_AUTHOR	"Michael S. Tsirkin <mst@redhat.com>"
+#define DRIVER_DESC	"Generic UIO driver for PCI 2.3 devices"
+
+struct uio_pci_generic_dev {
+	struct uio_info info;
+	struct pci_dev *pdev;
+	spinlock_t lock; /* guards command register accesses */
+};
+
+static inline struct uio_pci_generic_dev *
+to_uio_pci_generic_dev(struct uio_info *info)
+{
+	return container_of(info, struct uio_pci_generic_dev, info);
+}
+
+/* Interrupt handler. Read/modify/write the command register to disable
+ * the interrupt. */
+static irqreturn_t irqhandler(int irq, struct uio_info *info)
+{
+	struct uio_pci_generic_dev *gdev = to_uio_pci_generic_dev(info);
+	struct pci_dev *pdev = gdev->pdev;
+	irqreturn_t ret = IRQ_NONE;
+	u32 cmd_status_dword;
+	u16 origcmd, newcmd, status;
+
+	/* We do a single dword read to retrieve both command and status.
+	 * Document assumptions that make this possible. */
+	BUILD_BUG_ON(PCI_COMMAND % 4);
+	BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS);
+
+	spin_lock_irq(&gdev->lock);
+	pci_block_user_cfg_access(pdev);
+
+	/* Read both command and status registers in a single 32-bit operation.
+	 * Note: we could cache the value for command and move the status read
+	 * out of the lock if there was a way to get notified of user changes
+	 * to command register through sysfs. Should be good for shared irqs. */
+	pci_read_config_dword(pdev, PCI_COMMAND, &cmd_status_dword);
+	origcmd = cmd_status_dword;
+	status = cmd_status_dword >> 16;
+
+	/* Check interrupt status register to see whether our device
+	 * triggered the interrupt. */
+	if (!(status & PCI_STATUS_INTERRUPT))
+		goto done;
+
+	/* We triggered the interrupt, disable it. */
+	newcmd = origcmd | PCI_COMMAND_INTX_DISABLE;
+	if (newcmd != origcmd)
+		pci_write_config_word(pdev, PCI_COMMAND, newcmd);
+
+	/* UIO core will signal the user process. */
+	ret = IRQ_HANDLED;
+done:
+
+	pci_unblock_user_cfg_access(pdev);
+	spin_unlock_irq(&gdev->lock);
+	return ret;
+}
+
+/* Verify that the device supports Interrupt Disable bit in command register,
+ * per PCI 2.3, by flipping this bit and reading it back: this bit was readonly
+ * in PCI 2.2. */
+static int __devinit verify_pci_2_3(struct pci_dev *pdev)
+{
+	u16 orig, new;
+	int err = 0;
+
+	pci_block_user_cfg_access(pdev);
+	pci_read_config_word(pdev, PCI_COMMAND, &orig);
+	pci_write_config_word(pdev, PCI_COMMAND,
+			      orig ^ PCI_COMMAND_INTX_DISABLE);
+	pci_read_config_word(pdev, PCI_COMMAND, &new);
+	/* There's no way to protect against
+	 * hardware bugs or detect them reliably, but as long as we know
+	 * what the value should be, let's go ahead and check it. */
+	if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) {
+		err = -EBUSY;
+		dev_err(&pdev->dev, "Command changed from 0x%x to 0x%x: "
+			"driver or HW bug?\n", orig, new);
+		goto err;
+	}
+	if (!((new ^ orig) & PCI_COMMAND_INTX_DISABLE)) {
+		dev_warn(&pdev->dev, "Device does not support "
+			 "disabling interrupts: unable to bind.\n");
+		err = -ENODEV;
+		goto err;
+	}
+	/* Now restore the original value. */
+	pci_write_config_word(pdev, PCI_COMMAND, orig);
+err:
+	pci_unblock_user_cfg_access(pdev);
+	return err;
+}
+
+static int __devinit probe(struct pci_dev *pdev,
+			   const struct pci_device_id *id)
+{
+	struct uio_pci_generic_dev *gdev;
+	int err;
+
+	if (!pdev->irq) {
+		dev_warn(&pdev->dev, "No IRQ assigned to device: "
+			 "no support for interrupts?\n");
+		return -ENODEV;
+	}
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n",
+			__func__, err);
+		return err;
+	}
+
+	err = verify_pci_2_3(pdev);
+	if (err)
+		goto err_verify;
+
+	gdev = kzalloc(sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
+	if (!gdev) {
+		err = -ENOMEM;
+		goto err_alloc;
+	}
+
+	gdev->info.name = "uio_pci_generic";
+	gdev->info.version = DRIVER_VERSION;
+	gdev->info.irq = pdev->irq;
+	gdev->info.irq_flags = IRQF_SHARED;
+	gdev->info.handler = irqhandler;
+	gdev->pdev = pdev;
+	spin_lock_init(&gdev->lock);
+
+	if (uio_register_device(&pdev->dev, &gdev->info))
+		goto err_register;
+	pci_set_drvdata(pdev, gdev);
+
+	return 0;
+err_register:
+	kfree(gdev);
+err_alloc:
+err_verify:
+	pci_disable_device(pdev);
+	return err;
+}
+
+static void remove(struct pci_dev *pdev)
+{
+	struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev);
+
+	uio_unregister_device(&gdev->info);
+	pci_disable_device(pdev);
+	kfree(gdev);
+}
+
+static struct pci_driver driver = {
+	.name = "uio_pci_generic",
+	.id_table = NULL, /* only dynamic id's */
+	.probe = probe,
+	.remove = remove,
+};
+
+static int __init init(void)
+{
+	pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+	return pci_register_driver(&driver);
+}
+
+static void __exit cleanup(void)
+{
+	pci_unregister_driver(&driver);
+}
+
+module_init(init);
+module_exit(cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c
index bc39fc40bbd..fdfaa788551 100644
--- a/drivers/usb/core/endpoint.c
+++ b/drivers/usb/core/endpoint.c
@@ -154,7 +154,7 @@ static struct attribute *ep_dev_attrs[] = {
 static struct attribute_group ep_dev_attr_grp = {
 	.attrs = ep_dev_attrs,
 };
-static struct attribute_group *ep_dev_groups[] = {
+static const struct attribute_group *ep_dev_groups[] = {
 	&ep_dev_attr_grp,
 	NULL
 };
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index b5c72e45894..7ec3041ae79 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -573,7 +573,7 @@ static struct attribute_group dev_string_attr_grp = {
 	.is_visible =	dev_string_attrs_are_visible,
 };
 
-struct attribute_group *usb_device_groups[] = {
+const struct attribute_group *usb_device_groups[] = {
 	&dev_attr_grp,
 	&dev_string_attr_grp,
 	NULL
@@ -799,7 +799,7 @@ static struct attribute_group intf_assoc_attr_grp = {
 	.is_visible =	intf_assoc_attrs_are_visible,
 };
 
-struct attribute_group *usb_interface_groups[] = {
+const struct attribute_group *usb_interface_groups[] = {
 	&intf_attr_grp,
 	&intf_assoc_attr_grp,
 	NULL
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index e2a8cfaade1..c0e0ae2bb8e 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -152,8 +152,8 @@ static inline int is_active(const struct usb_interface *f)
 extern const char *usbcore_name;
 
 /* sysfs stuff */
-extern struct attribute_group *usb_device_groups[];
-extern struct attribute_group *usb_interface_groups[];
+extern const struct attribute_group *usb_device_groups[];
+extern const struct attribute_group *usb_interface_groups[];
 
 /* usbfs stuff */
 extern struct mutex usbfs_mutex;
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 274751b4409..5cd0e48f67f 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -67,7 +67,7 @@ MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");
  * debug = 0, no debugging messages
  * debug = 1, dump failed URBs except for stalls
  * debug = 2, dump all failed URBs (including stalls)
- *            show all queues in /debug/uhci/[pci_addr]
+ *            show all queues in /sys/kernel/debug/uhci/[pci_addr]
  * debug = 3, show all TDs in URBs when dumping
  */
 #ifdef DEBUG
diff --git a/drivers/uwb/lc-dev.c b/drivers/uwb/lc-dev.c
index e9fe1bb7eb2..1097e81b56d 100644
--- a/drivers/uwb/lc-dev.c
+++ b/drivers/uwb/lc-dev.c
@@ -255,7 +255,7 @@ static struct attribute_group dev_attr_group = {
 	.attrs = dev_attrs,
 };
 
-static struct attribute_group *groups[] = {
+static const struct attribute_group *groups[] = {
 	&dev_attr_group,
 	NULL,
 };