diff options
Diffstat (limited to 'drivers/base/core.c')
| -rw-r--r-- | drivers/base/core.c | 596 |
1 files changed, 320 insertions, 276 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 2683eac30c6..b1727876182 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -18,18 +18,26 @@ #include <linux/string.h> #include <linux/kdev_t.h> #include <linux/notifier.h> - +#include <linux/genhd.h> #include <asm/semaphore.h> #include "base.h" #include "power/power.h" -int (*platform_notify)(struct device * dev) = NULL; -int (*platform_notify_remove)(struct device * dev) = NULL; +int (*platform_notify)(struct device *dev) = NULL; +int (*platform_notify_remove)(struct device *dev) = NULL; -/* - * sysfs bindings for devices. - */ +#ifdef CONFIG_BLOCK +static inline int device_is_not_partition(struct device *dev) +{ + return !(dev->type == &part_type); +} +#else +static inline int device_is_not_partition(struct device *dev) +{ + return 1; +} +#endif /** * dev_driver_string - Return a device's driver name, if at all possible @@ -51,11 +59,11 @@ EXPORT_SYMBOL(dev_driver_string); #define to_dev(obj) container_of(obj, struct device, kobj) #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) -static ssize_t -dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) +static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) { - struct device_attribute * dev_attr = to_dev_attr(attr); - struct device * dev = to_dev(kobj); + struct device_attribute *dev_attr = to_dev_attr(attr); + struct device *dev = to_dev(kobj); ssize_t ret = -EIO; if (dev_attr->show) @@ -63,12 +71,11 @@ dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) return ret; } -static ssize_t -dev_attr_store(struct kobject * kobj, struct attribute * attr, - const char * buf, size_t count) +static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) { - struct device_attribute * dev_attr = to_dev_attr(attr); - struct device * dev = to_dev(kobj); + struct device_attribute *dev_attr = to_dev_attr(attr); + struct device *dev = to_dev(kobj); ssize_t ret = -EIO; if (dev_attr->store) @@ -90,9 +97,9 @@ static struct sysfs_ops dev_sysfs_ops = { * reaches 0. We forward the call to the device's release * method, which should handle actually freeing the structure. */ -static void device_release(struct kobject * kobj) +static void device_release(struct kobject *kobj) { - struct device * dev = to_dev(kobj); + struct device *dev = to_dev(kobj); if (dev->release) dev->release(dev); @@ -101,8 +108,8 @@ static void device_release(struct kobject * kobj) else if (dev->class && dev->class->dev_release) dev->class->dev_release(dev); else { - printk(KERN_ERR "Device '%s' does not have a release() function, " - "it is broken and must be fixed.\n", + printk(KERN_ERR "Device '%s' does not have a release() " + "function, it is broken and must be fixed.\n", dev->bus_id); WARN_ON(1); } @@ -185,7 +192,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); if (dev->driver) - add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); + add_uevent_var(env, "PHYSDEVDRIVER=%s", + dev->driver->name); } #endif @@ -193,15 +201,16 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, if (dev->bus && dev->bus->uevent) { retval = dev->bus->uevent(dev, env); if (retval) - pr_debug ("%s: bus uevent() returned %d\n", - __FUNCTION__, retval); + pr_debug("device: '%s': %s: bus uevent() returned %d\n", + dev->bus_id, __FUNCTION__, retval); } /* have the class specific function add its stuff */ if (dev->class && dev->class->dev_uevent) { retval = dev->class->dev_uevent(dev, env); if (retval) - pr_debug("%s: class uevent() returned %d\n", + pr_debug("device: '%s': %s: class uevent() " + "returned %d\n", dev->bus_id, __FUNCTION__, retval); } @@ -209,7 +218,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, if (dev->type && dev->type->uevent) { retval = dev->type->uevent(dev, env); if (retval) - pr_debug("%s: dev_type uevent() returned %d\n", + pr_debug("device: '%s': %s: dev_type uevent() " + "returned %d\n", dev->bus_id, __FUNCTION__, retval); } @@ -325,7 +335,8 @@ static int device_add_groups(struct device *dev, error = sysfs_create_group(&dev->kobj, groups[i]); if (error) { while (--i >= 0) - sysfs_remove_group(&dev->kobj, groups[i]); + sysfs_remove_group(&dev->kobj, + groups[i]); break; } } @@ -401,20 +412,15 @@ static ssize_t show_dev(struct device *dev, struct device_attribute *attr, static struct device_attribute devt_attr = __ATTR(dev, S_IRUGO, show_dev, NULL); -/* - * devices_subsys - structure to be registered with kobject core. - */ - -decl_subsys(devices, &device_ktype, &device_uevent_ops); - +/* kset to create /sys/devices/ */ +struct kset *devices_kset; /** - * device_create_file - create sysfs attribute file for device. - * @dev: device. - * @attr: device attribute descriptor. + * device_create_file - create sysfs attribute file for device. + * @dev: device. + * @attr: device attribute descriptor. */ - -int device_create_file(struct device * dev, struct device_attribute * attr) +int device_create_file(struct device *dev, struct device_attribute *attr) { int error = 0; if (get_device(dev)) { @@ -425,12 +431,11 @@ int device_create_file(struct device * dev, struct device_attribute * attr) } /** - * device_remove_file - remove sysfs attribute file. - * @dev: device. - * @attr: device attribute descriptor. + * device_remove_file - remove sysfs attribute file. + * @dev: device. + * @attr: device attribute descriptor. */ - -void device_remove_file(struct device * dev, struct device_attribute * attr) +void device_remove_file(struct device *dev, struct device_attribute *attr) { if (get_device(dev)) { sysfs_remove_file(&dev->kobj, &attr->attr); @@ -511,22 +516,20 @@ static void klist_children_put(struct klist_node *n) put_device(dev); } - /** - * device_initialize - init device structure. - * @dev: device. + * device_initialize - init device structure. + * @dev: device. * - * This prepares the device for use by other layers, - * including adding it to the device hierarchy. - * It is the first half of device_register(), if called by - * that, though it can also be called separately, so one - * may use @dev's fields (e.g. the refcount). + * This prepares the device for use by other layers, + * including adding it to the device hierarchy. + * It is the first half of device_register(), if called by + * that, though it can also be called separately, so one + * may use @dev's fields (e.g. the refcount). */ - void device_initialize(struct device *dev) { - kobj_set_kset_s(dev, devices_subsys); - kobject_init(&dev->kobj); + dev->kobj.kset = devices_kset; + kobject_init(&dev->kobj, &device_ktype); klist_init(&dev->klist_children, klist_children_get, klist_children_put); INIT_LIST_HEAD(&dev->dma_pools); @@ -539,36 +542,39 @@ void device_initialize(struct device *dev) } #ifdef CONFIG_SYSFS_DEPRECATED -static struct kobject * get_device_parent(struct device *dev, - struct device *parent) +static struct kobject *get_device_parent(struct device *dev, + struct device *parent) { - /* - * Set the parent to the class, not the parent device - * for topmost devices in class hierarchy. - * This keeps sysfs from having a symlink to make old - * udevs happy - */ + /* class devices without a parent live in /sys/class/<classname>/ */ if (dev->class && (!parent || parent->class != dev->class)) return &dev->class->subsys.kobj; + /* all other devices keep their parent */ else if (parent) return &parent->kobj; return NULL; } + +static inline void cleanup_device_parent(struct device *dev) {} +static inline void cleanup_glue_dir(struct device *dev, + struct kobject *glue_dir) {} #else static struct kobject *virtual_device_parent(struct device *dev) { static struct kobject *virtual_dir = NULL; if (!virtual_dir) - virtual_dir = kobject_add_dir(&devices_subsys.kobj, "virtual"); + virtual_dir = kobject_create_and_add("virtual", + &devices_kset->kobj); return virtual_dir; } -static struct kobject * get_device_parent(struct device *dev, - struct device *parent) +static struct kobject *get_device_parent(struct device *dev, + struct device *parent) { + int retval; + if (dev->class) { struct kobject *kobj = NULL; struct kobject *parent_kobj; @@ -576,8 +582,8 @@ static struct kobject * get_device_parent(struct device *dev, /* * If we have no parent, we live in "virtual". - * Class-devices with a bus-device as parent, live - * in a class-directory to prevent namespace collisions. + * Class-devices with a non class-device as parent, live + * in a "glue" directory to prevent namespace collisions. */ if (parent == NULL) parent_kobj = virtual_device_parent(dev); @@ -598,25 +604,45 @@ static struct kobject * get_device_parent(struct device *dev, return kobj; /* or create a new class-directory at the parent device */ - return kobject_kset_add_dir(&dev->class->class_dirs, - parent_kobj, dev->class->name); + k = kobject_create(); + if (!k) + return NULL; + k->kset = &dev->class->class_dirs; + retval = kobject_add(k, parent_kobj, "%s", dev->class->name); + if (retval < 0) { + kobject_put(k); + return NULL; + } + /* do not emit an uevent for this simple "glue" directory */ + return k; } if (parent) return &parent->kobj; return NULL; } + +static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) +{ + /* see if we live in a "glue" directory */ + if (!dev->class || glue_dir->kset != &dev->class->class_dirs) + return; + + kobject_put(glue_dir); +} + +static void cleanup_device_parent(struct device *dev) +{ + cleanup_glue_dir(dev, dev->kobj.parent); +} #endif -static int setup_parent(struct device *dev, struct device *parent) +static void setup_parent(struct device *dev, struct device *parent) { struct kobject *kobj; kobj = get_device_parent(dev, parent); - if (IS_ERR(kobj)) - return PTR_ERR(kobj); if (kobj) dev->kobj.parent = kobj; - return 0; } static int device_add_class_symlinks(struct device *dev) @@ -625,65 +651,76 @@ static int device_add_class_symlinks(struct device *dev) if (!dev->class) return 0; + error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, "subsystem"); if (error) goto out; - /* - * If this is not a "fake" compatible device, then create the - * symlink from the class to the device. - */ - if (dev->kobj.parent != &dev->class->subsys.kobj) { + +#ifdef CONFIG_SYSFS_DEPRECATED + /* stacked class devices need a symlink in the class directory */ + if (dev->kobj.parent != &dev->class->subsys.kobj && + device_is_not_partition(dev)) { error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, dev->bus_id); if (error) goto out_subsys; } - if (dev->parent) { -#ifdef CONFIG_SYSFS_DEPRECATED - { - struct device *parent = dev->parent; - char *class_name; - - /* - * In old sysfs stacked class devices had 'device' - * link pointing to real device instead of parent - */ - while (parent->class && !parent->bus && parent->parent) - parent = parent->parent; - - error = sysfs_create_link(&dev->kobj, - &parent->kobj, - "device"); - if (error) - goto out_busid; - class_name = make_class_name(dev->class->name, - &dev->kobj); - if (class_name) - error = sysfs_create_link(&dev->parent->kobj, - &dev->kobj, class_name); - kfree(class_name); - if (error) - goto out_device; - } -#else - error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, + if (dev->parent && device_is_not_partition(dev)) { + struct device *parent = dev->parent; + char *class_name; + + /* + * stacked class devices have the 'device' link + * pointing to the bus device instead of the parent + */ + while (parent->class && !parent->bus && parent->parent) + parent = parent->parent; + + error = sysfs_create_link(&dev->kobj, + &parent->kobj, "device"); if (error) goto out_busid; -#endif + + class_name = make_class_name(dev->class->name, + &dev->kobj); + if (class_name) + error = sysfs_create_link(&dev->parent->kobj, + &dev->kobj, class_name); + kfree(class_name); + if (error) + goto out_device; } return 0; -#ifdef CONFIG_SYSFS_DEPRECATED out_device: - if (dev->parent) + if (dev->parent && device_is_not_partition(dev)) sysfs_remove_link(&dev->kobj, "device"); -#endif out_busid: - if (dev->kobj.parent != &dev->class->subsys.kobj) + if (dev->kobj.parent != &dev->class->subsys.kobj && + device_is_not_partition(dev)) sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); +#else + /* link in the class directory pointing to the device */ + error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, + dev->bus_id); + if (error) + goto out_subsys; + + if (dev->parent && device_is_not_partition(dev)) { + error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, + "device"); + if (error) + goto out_busid; + } + return 0; + +out_busid: + sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); +#endif + out_subsys: sysfs_remove_link(&dev->kobj, "subsystem"); out: @@ -694,8 +731,9 @@ static void device_remove_class_symlinks(struct device *dev) { if (!dev->class) return; - if (dev->parent) { + #ifdef CONFIG_SYSFS_DEPRECATED + if (dev->parent && device_is_not_partition(dev)) { char *class_name; class_name = make_class_name(dev->class->name, &dev->kobj); @@ -703,45 +741,59 @@ static void device_remove_class_symlinks(struct device *dev) sysfs_remove_link(&dev->parent->kobj, class_name); kfree(class_name); } -#endif sysfs_remove_link(&dev->kobj, "device"); } - if (dev->kobj.parent != &dev->class->subsys.kobj) + + if (dev->kobj.parent != &dev->class->subsys.kobj && + device_is_not_partition(dev)) sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); +#else + if (dev->parent && device_is_not_partition(dev)) + sysfs_remove_link(&dev->kobj, "device"); + + sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); +#endif + sysfs_remove_link(&dev->kobj, "subsystem"); } /** - * device_add - add device to device hierarchy. - * @dev: device. + * device_add - add device to device hierarchy. + * @dev: device. * - * This is part 2 of device_register(), though may be called - * separately _iff_ device_initialize() has been called separately. + * This is part 2 of device_register(), though may be called + * separately _iff_ device_initialize() has been called separately. * - * This adds it to the kobject hierarchy via kobject_add(), adds it - * to the global and sibling lists for the device, then - * adds it to the other relevant subsystems of the driver model. + * This adds it to the kobject hierarchy via kobject_add(), adds it + * to the global and sibling lists for the device, then + * adds it to the other relevant subsystems of the driver model. */ int device_add(struct device *dev) { struct device *parent = NULL; struct class_interface *class_intf; - int error = -EINVAL; + int error; + + error = pm_sleep_lock(); + if (error) { + dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__); + dump_stack(); + return error; + } dev = get_device(dev); - if (!dev || !strlen(dev->bus_id)) + if (!dev || !strlen(dev->bus_id)) { + error = -EINVAL; goto Error; + } - pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); + pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); parent = get_device(dev->parent); - error = setup_parent(dev, parent); - if (error) - goto Error; + setup_parent(dev, parent); /* first, register with generic layer. */ - kobject_set_name(&dev->kobj, "%s", dev->bus_id); - error = kobject_add(&dev->kobj); + error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); if (error) goto Error; @@ -751,7 +803,7 @@ int device_add(struct device *dev) /* notify clients of device entry (new way) */ if (dev->bus) - blocking_notifier_call_chain(&dev->bus->bus_notifier, + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_ADD_DEVICE, dev); error = device_create_file(dev, &uevent_attr); @@ -795,13 +847,14 @@ int device_add(struct device *dev) } Done: put_device(dev); + pm_sleep_unlock(); return error; BusError: device_pm_remove(dev); dpm_sysfs_remove(dev); PMError: if (dev->bus) - blocking_notifier_call_chain(&dev->bus->bus_notifier, + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_DEL_DEVICE, dev); device_remove_attrs(dev); AttrsError: @@ -809,124 +862,84 @@ int device_add(struct device *dev) SymlinkError: if (MAJOR(dev->devt)) device_remove_file(dev, &devt_attr); - - if (dev->class) { - sysfs_remove_link(&dev->kobj, "subsystem"); - /* If this is not a "fake" compatible device, remove the - * symlink from the class to the device. */ - if (dev->kobj.parent != &dev->class->subsys.kobj) - sysfs_remove_link(&dev->class->subsys.kobj, - dev->bus_id); - if (parent) { -#ifdef CONFIG_SYSFS_DEPRECATED - char *class_name = make_class_name(dev->class->name, - &dev->kobj); - if (class_name) - sysfs_remove_link(&dev->parent->kobj, - class_name); - kfree(class_name); -#endif - sysfs_remove_link(&dev->kobj, "device"); - } - } ueventattrError: device_remove_file(dev, &uevent_attr); attrError: kobject_uevent(&dev->kobj, KOBJ_REMOVE); kobject_del(&dev->kobj); Error: + cleanup_device_parent(dev); if (parent) put_device(parent); goto Done; } - /** - * device_register - register a device with the system. - * @dev: pointer to the device structure + * device_register - register a device with the system. + * @dev: pointer to the device structure * - * This happens in two clean steps - initialize the device - * and add it to the system. The two steps can be called - * separately, but this is the easiest and most common. - * I.e. you should only call the two helpers separately if - * have a clearly defined need to use and refcount the device - * before it is added to the hierarchy. + * This happens in two clean steps - initialize the device + * and add it to the system. The two steps can be called + * separately, but this is the easiest and most common. + * I.e. you should only call the two helpers separately if + * have a clearly defined need to use and refcount the device + * before it is added to the hierarchy. */ - int device_register(struct device *dev) { device_initialize(dev); return device_add(dev); } - /** - * get_device - increment reference count for device. - * @dev: device. + * get_device - increment reference count for device. + * @dev: device. * - * This simply forwards the call to kobject_get(), though - * we do take care to provide for the case that we get a NULL - * pointer passed in. + * This simply forwards the call to kobject_get(), though + * we do take care to provide for the case that we get a NULL + * pointer passed in. */ - -struct device * get_device(struct device * dev) +struct device *get_device(struct device *dev) { return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; } - /** - * put_device - decrement reference count. - * @dev: device in question. + * put_device - decrement reference count. + * @dev: device in question. */ -void put_device(struct device * dev) +void put_device(struct device *dev) { + /* might_sleep(); */ if (dev) kobject_put(&dev->kobj); } - /** - * device_del - delete device from system. - * @dev: device. + * device_del - delete device from system. + * @dev: device. * - * This is the first part of the device unregistration - * sequence. This removes the device from the lists we control - * from here, has it removed from the other driver model - * subsystems it was added to in device_add(), and removes it - * from the kobject hierarchy. + * This is the first part of the device unregistration + * sequence. This removes the device from the lists we control + * from here, has it removed from the other driver model + * subsystems it was added to in device_add(), and removes it + * from the kobject hierarchy. * - * NOTE: this should be called manually _iff_ device_add() was - * also called manually. + * NOTE: this should be called manually _iff_ device_add() was + * also called manually. */ - -void device_del(struct device * dev) +void device_del(struct device *dev) { - struct device * parent = dev->parent; + struct device *parent = dev->parent; struct class_interface *class_intf; + device_pm_remove(dev); if (parent) klist_del(&dev->knode_parent); if (MAJOR(dev->devt)) device_remove_file(dev, &devt_attr); if (dev->class) { - sysfs_remove_link(&dev->kobj, "subsystem"); - /* If this is not a "fake" compatible device, remove the - * symlink from the class to the device. */ - if (dev->kobj.parent != &dev->class->subsys.kobj) - sysfs_remove_link(&dev->class->subsys.kobj, - dev->bus_id); - if (parent) { -#ifdef CONFIG_SYSFS_DEPRECATED - char *class_name = make_class_name(dev->class->name, - &dev->kobj); - if (class_name) - sysfs_remove_link(&dev->parent->kobj, - class_name); - kfree(class_name); -#endif - sysfs_remove_link(&dev->kobj, "device"); - } + device_remove_class_symlinks(dev); down(&dev->class->sem); /* notify any interfaces that the device is now gone */ @@ -936,31 +949,6 @@ void device_del(struct device * dev) /* remove the device from the class list */ list_del_init(&dev->node); up(&dev->class->sem); - - /* If we live in a parent class-directory, unreference it */ - if (dev->kobj.parent->kset == &dev->class->class_dirs) { - struct device *d; - int other = 0; - - /* - * if we are the last child of our class, delete - * our class-directory at this parent - */ - down(&dev->class->sem); - list_for_each_entry(d, &dev->class->devices, node) { - if (d == dev) - continue; - if (d->kobj.parent == dev->kobj.parent) { - other = 1; - break; - } - } - if (!other) - kobject_del(dev->kobj.parent); - - kobject_put(dev->kobj.parent); - up(&dev->class->sem); - } } device_remove_file(dev, &uevent_attr); device_remove_attrs(dev); @@ -979,57 +967,55 @@ void device_del(struct device * dev) if (platform_notify_remove) platform_notify_remove(dev); if (dev->bus) - blocking_notifier_call_chain(&dev->bus->bus_notifier, + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_DEL_DEVICE, dev); - device_pm_remove(dev); kobject_uevent(&dev->kobj, KOBJ_REMOVE); + cleanup_device_parent(dev); kobject_del(&dev->kobj); - if (parent) - put_device(parent); + put_device(parent); } /** - * device_unregister - unregister device from system. - * @dev: device going away. + * device_unregister - unregister device from system. + * @dev: device going away. * - * We do this in two parts, like we do device_register(). First, - * we remove it from all the subsystems with device_del(), then - * we decrement the reference count via put_device(). If that - * is the final reference count, the device will be cleaned up - * via device_release() above. Otherwise, the structure will - * stick around until the final reference to the device is dropped. + * We do this in two parts, like we do device_register(). First, + * we remove it from all the subsystems with device_del(), then + * we decrement the reference count via put_device(). If that + * is the final reference count, the device will be cleaned up + * via device_release() above. Otherwise, the structure will + * stick around until the final reference to the device is dropped. */ -void device_unregister(struct device * dev) +void device_unregister(struct device *dev) { - pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); + pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); device_del(dev); put_device(dev); } - -static struct device * next_device(struct klist_iter * i) +static struct device *next_device(struct klist_iter *i) { - struct klist_node * n = klist_next(i); + struct klist_node *n = klist_next(i); return n ? container_of(n, struct device, knode_parent) : NULL; } /** - * device_for_each_child - device child iterator. - * @parent: parent struct device. - * @data: data for the callback. - * @fn: function to be called for each device. + * device_for_each_child - device child iterator. + * @parent: parent struct device. + * @data: data for the callback. + * @fn: function to be called for each device. * - * Iterate over @parent's child devices, and call @fn for each, - * passing it @data. + * Iterate over @parent's child devices, and call @fn for each, + * passing it @data. * - * We check the return of @fn each time. If it returns anything - * other than 0, we break out and return that value. + * We check the return of @fn each time. If it returns anything + * other than 0, we break out and return that value. */ -int device_for_each_child(struct device * parent, void * data, - int (*fn)(struct device *, void *)) +int device_for_each_child(struct device *parent, void *data, + int (*fn)(struct device *dev, void *data)) { struct klist_iter i; - struct device * child; + struct device *child; int error = 0; klist_iter_init(&parent->klist_children, &i); @@ -1054,8 +1040,8 @@ int device_for_each_child(struct device * parent, void * data, * current device can be obtained, this function will return to the caller * and not iterate over any more devices. */ -struct device * device_find_child(struct device *parent, void *data, - int (*match)(struct device *, void *)) +struct device *device_find_child(struct device *parent, void *data, + int (*match)(struct device *dev, void *data)) { struct klist_iter i; struct device *child; @@ -1073,7 +1059,10 @@ struct device * device_find_child(struct device *parent, void *data, int __init devices_init(void) { - return subsystem_register(&devices_subsys); + devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); + if (!devices_kset) + return -ENOMEM; + return 0; } EXPORT_SYMBOL_GPL(device_for_each_child); @@ -1094,7 +1083,7 @@ EXPORT_SYMBOL_GPL(device_remove_file); static void device_create_release(struct device *dev) { - pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); + pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); kfree(dev); } @@ -1156,14 +1145,11 @@ error: EXPORT_SYMBOL_GPL(device_create); /** - * device_destroy - removes a device that was created with device_create() + * find_device - finds a device that was created with device_create() * @class: pointer to the struct class that this device was registered with * @devt: the dev_t of the device that was previously registered - * - * This call unregisters and cleans up a device that was created with a - * call to device_create(). */ -void device_destroy(struct class *class, dev_t devt) +static struct device *find_device(struct class *class, dev_t devt) { struct device *dev = NULL; struct device *dev_tmp; @@ -1176,12 +1162,54 @@ void device_destroy(struct class *class, dev_t devt) } } up(&class->sem); + return dev; +} +/** + * device_destroy - removes a device that was created with device_create() + * @class: pointer to the struct class that this device was registered with + * @devt: the dev_t of the device that was previously registered + * + * This call unregisters and cleans up a device that was created with a + * call to device_create(). + */ +void device_destroy(struct class *class, dev_t devt) +{ + struct device *dev; + + dev = find_device(class, devt); if (dev) device_unregister(dev); } EXPORT_SYMBOL_GPL(device_destroy); +#ifdef CONFIG_PM_SLEEP +/** + * destroy_suspended_device - asks the PM core to remove a suspended device + * @class: pointer to the struct class that this device was registered with + * @devt: the dev_t of the device that was previously registered + * + * This call notifies the PM core of the necessity to unregister a suspended + * device created with a call to device_create() (devices cannot be + * unregistered directly while suspended, since the PM core holds their + * semaphores at that time). + * + * It can only be called within the scope of a system sleep transition. In + * practice this means it has to be directly or indirectly invoked either by + * a suspend or resume method, or by the PM core (e.g. via + * disable_nonboot_cpus() or enable_nonboot_cpus()). + */ +void destroy_suspended_device(struct class *class, dev_t devt) +{ + struct device *dev; + + dev = find_device(class, devt); + if (dev) + device_pm_schedule_removal(dev); +} +EXPORT_SYMBOL_GPL(destroy_suspended_device); +#endif /* CONFIG_PM_SLEEP */ + /** * device_rename - renames a device * @dev: the pointer to the struct device to be renamed @@ -1198,7 +1226,8 @@ int device_rename(struct device *dev, char *new_name) if (!dev) return -EINVAL; - pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); + pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, + __FUNCTION__, new_name); #ifdef CONFIG_SYSFS_DEPRECATED if ((dev->class) && (dev->parent)) @@ -1279,8 +1308,7 @@ static int device_move_class_links(struct device *dev, class_name); if (error) sysfs_remove_link(&dev->kobj, "device"); - } - else + } else error = 0; out: kfree(class_name); @@ -1311,16 +1339,13 @@ int device_move(struct device *dev, struct device *new_parent) return -EINVAL; new_parent = get_device(new_parent); - new_parent_kobj = get_device_parent (dev, new_parent); - if (IS_ERR(new_parent_kobj)) { - error = PTR_ERR(new_parent_kobj); - put_device(new_parent); - goto out; - } - pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, - new_parent ? new_parent->bus_id : "<NULL>"); + new_parent_kobj = get_device_parent(dev, new_parent); + + pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, + __FUNCTION__, new_parent ? new_parent->bus_id : "<NULL>"); error = kobject_move(&dev->kobj, new_parent_kobj); if (error) { + cleanup_glue_dir(dev, new_parent_kobj); put_device(new_parent); goto out; } @@ -1343,6 +1368,7 @@ int device_move(struct device *dev, struct device *new_parent) klist_add_tail(&dev->knode_parent, &old_parent->klist_children); } + cleanup_glue_dir(dev, new_parent_kobj); put_device(new_parent); goto out; } @@ -1352,5 +1378,23 @@ out: put_device(dev); return error; } - EXPORT_SYMBOL_GPL(device_move); + +/** + * device_shutdown - call ->shutdown() on each device to shutdown. + */ +void device_shutdown(void) +{ + struct device *dev, *devn; + + list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, + kobj.entry) { + if (dev->bus && dev->bus->shutdown) { + dev_dbg(dev, "shutdown\n"); + dev->bus->shutdown(dev); + } else if (dev->driver && dev->driver->shutdown) { + dev_dbg(dev, "shutdown\n"); + dev->driver->shutdown(dev); + } + } +} |