Merge tag 'driver-core-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here's the big driver-core pull request for 3.17-rc1.

  Largest thing in here is the dma-buf rework and fence code, that
  touched many different subsystems so it was agreed it should go
  through this tree to handle merge issues.  There's also some firmware
  loading updates, as well as tests added, and a few other tiny changes,
  the changelog has the details.

  All have been in linux-next for a long time"

* tag 'driver-core-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (32 commits)
  ARM: imx: Remove references to platform_bus in mxc code
  firmware loader: Fix _request_firmware_load() return val for fw load abort
  platform: Remove most references to platform_bus device
  test: add firmware_class loader test
  doc: fix minor typos in firmware_class README
  staging: android: Cleanup style issues
  Documentation: devres: Sort managed interfaces
  Documentation: devres: Add devm_kmalloc() et al
  fs: debugfs: remove trailing whitespace
  kernfs: kernel-doc warning fix
  debugfs: Fix corrupted loop in debugfs_remove_recursive
  stable_kernel_rules: Add pointer to netdev-FAQ for network patches
  driver core: platform: add device binding path 'driver_override'
  driver core/platform: remove unused implicit padding in platform_object
  firmware loader: inform direct failure when udev loader is disabled
  firmware: replace ALIGN(PAGE_SIZE) by PAGE_ALIGN
  firmware: read firmware size using i_size_read()
  firmware loader: allow disabling of udev as firmware loader
  reservation: add suppport for read-only access using rcu
  reservation: update api and add some helpers
  ...

Conflicts:
	drivers/base/platform.c

4 files changed, 131 insertions, 28 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 901096d31c6..f8f45ec0ed4 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1635,6 +1635,19 @@ config TEST_BPF
 
 	  If unsure, say N.
 
+config TEST_FIRMWARE
+	tristate "Test firmware loading via userspace interface"
+	default n
+	depends on FW_LOADER
+	help
+	  This builds the "test_firmware" module that creates a userspace
+	  interface for testing firmware loading. This can be used to
+	  control the triggering of firmware loading without needing an
+	  actual firmware-using device. The contents can be rechecked by
+	  userspace.
+
+	  If unsure, say N.
+
 source "samples/Kconfig"
 
 source "lib/Kconfig.kgdb"
diff --git a/lib/Makefile b/lib/Makefile
index ba967a19edb..230b4b1456d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
 obj-$(CONFIG_TEST_MODULE) += test_module.o
 obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
 obj-$(CONFIG_TEST_BPF) += test_bpf.o
+obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
 
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/devres.c b/lib/devres.c
index f562bf6ff71..6a4aee8a3a7 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -142,34 +142,6 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 }
 EXPORT_SYMBOL(devm_ioremap_resource);
 
-/**
- * devm_request_and_ioremap() - Check, request region, and ioremap resource
- * @dev: Generic device to handle the resource for
- * @res: resource to be handled
- *
- * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
- * everything is undone on driver detach. Checks arguments, so you can feed
- * it the result from e.g. platform_get_resource() directly. Returns the
- * remapped pointer or NULL on error. Usage example:
- *
- *	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- *	base = devm_request_and_ioremap(&pdev->dev, res);
- *	if (!base)
- *		return -EADDRNOTAVAIL;
- */
-void __iomem *devm_request_and_ioremap(struct device *dev,
-				       struct resource *res)
-{
-	void __iomem *dest_ptr;
-
-	dest_ptr = devm_ioremap_resource(dev, res);
-	if (IS_ERR(dest_ptr))
-		return NULL;
-
-	return dest_ptr;
-}
-EXPORT_SYMBOL(devm_request_and_ioremap);
-
 #ifdef CONFIG_HAS_IOPORT_MAP
 /*
  * Generic iomap devres
diff --git a/lib/test_firmware.c b/lib/test_firmware.c
new file mode 100644
index 00000000000..86374c1c49a
--- /dev/null
+++ b/lib/test_firmware.c
@@ -0,0 +1,117 @@
+/*
+ * This module provides an interface to trigger and test firmware loading.
+ *
+ * It is designed to be used for basic evaluation of the firmware loading
+ * subsystem (for example when validating firmware verification). It lacks
+ * any extra dependencies, and will not normally be loaded by the system
+ * unless explicitly requested by name.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/firmware.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+static DEFINE_MUTEX(test_fw_mutex);
+static const struct firmware *test_firmware;
+
+static ssize_t test_fw_misc_read(struct file *f, char __user *buf,
+				 size_t size, loff_t *offset)
+{
+	ssize_t rc = 0;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_firmware)
+		rc = simple_read_from_buffer(buf, size, offset,
+					     test_firmware->data,
+					     test_firmware->size);
+	mutex_unlock(&test_fw_mutex);
+	return rc;
+}
+
+static const struct file_operations test_fw_fops = {
+	.owner          = THIS_MODULE,
+	.read           = test_fw_misc_read,
+};
+
+static struct miscdevice test_fw_misc_device = {
+	.minor          = MISC_DYNAMIC_MINOR,
+	.name           = "test_firmware",
+	.fops           = &test_fw_fops,
+};
+
+static ssize_t trigger_request_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	int rc;
+	char *name;
+
+	name = kzalloc(count + 1, GFP_KERNEL);
+	if (!name)
+		return -ENOSPC;
+	memcpy(name, buf, count);
+
+	pr_info("loading '%s'\n", name);
+
+	mutex_lock(&test_fw_mutex);
+	release_firmware(test_firmware);
+	test_firmware = NULL;
+	rc = request_firmware(&test_firmware, name, dev);
+	if (rc)
+		pr_info("load of '%s' failed: %d\n", name, rc);
+	pr_info("loaded: %zu\n", test_firmware ? test_firmware->size : 0);
+	mutex_unlock(&test_fw_mutex);
+
+	kfree(name);
+
+	return count;
+}
+static DEVICE_ATTR_WO(trigger_request);
+
+static int __init test_firmware_init(void)
+{
+	int rc;
+
+	rc = misc_register(&test_fw_misc_device);
+	if (rc) {
+		pr_err("could not register misc device: %d\n", rc);
+		return rc;
+	}
+	rc = device_create_file(test_fw_misc_device.this_device,
+				&dev_attr_trigger_request);
+	if (rc) {
+		pr_err("could not create sysfs interface: %d\n", rc);
+		goto dereg;
+	}
+
+	pr_warn("interface ready\n");
+
+	return 0;
+dereg:
+	misc_deregister(&test_fw_misc_device);
+	return rc;
+}
+
+module_init(test_firmware_init);
+
+static void __exit test_firmware_exit(void)
+{
+	release_firmware(test_firmware);
+	device_remove_file(test_fw_misc_device.this_device,
+			   &dev_attr_trigger_request);
+	misc_deregister(&test_fw_misc_device);
+	pr_warn("removed interface\n");
+}
+
+module_exit(test_firmware_exit);
+
+MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
+MODULE_LICENSE("GPL");