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Diffstat (limited to 'drivers/base/core.c')
-rw-r--r--drivers/base/core.c582
1 files changed, 309 insertions, 273 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 2683eac30c68..edf3bbeb8d6a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -18,14 +18,14 @@
#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.
@@ -51,11 +51,11 @@ 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 +63,11 @@ 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 +89,9 @@ 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 +100,8 @@ 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 +184,8 @@ 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 +193,16 @@ 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 +210,8 @@ 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 +327,8 @@ 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 +404,15 @@ 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 +423,11 @@ 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 +508,20 @@ 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 +534,39 @@ 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 +574,8 @@ 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 +596,45 @@ 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 +643,76 @@ 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 &&
+ dev->type != &part_type) {
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 && dev->type != &part_type) {
+ 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 && dev->type != &part_type)
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 &&
+ dev->type != &part_type)
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 && dev->type != &part_type) {
+ 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 +723,9 @@ static void device_remove_class_symlinks(struct device *dev)
{
if (!dev->class)
return;
- if (dev->parent) {
+
#ifdef CONFIG_SYSFS_DEPRECATED
+ if (dev->parent && dev->type != &part_type) {
char *class_name;
class_name = make_class_name(dev->class->name, &dev->kobj);
@@ -703,45 +733,59 @@ 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 &&
+ dev->type != &part_type)
sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
+#else
+ if (dev->parent && dev->type != &part_type)
+ 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 +795,7 @@ 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 +839,14 @@ 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 +854,84 @@ 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 +941,6 @@ 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 +959,55 @@ 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 +1032,8 @@ 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 +1051,10 @@ 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 +1075,7 @@ 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 +1137,11 @@ 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 +1154,54 @@ 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 +1218,8 @@ 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 +1300,7 @@ 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 +1331,13 @@ 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 +1360,7 @@ 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 +1370,23 @@ 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);
+ }
+ }
+}