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

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6:
  debugfs: fix sparse warnings
  Driver core: Fix cleanup when failing device_add().
  driver core: Remove dpm_sysfs_remove() from error path of device_add()
  PM: fix new mutex-locking bug in the PM core
  PM: Do not acquire device semaphores upfront during suspend
  kobject: properly initialize ksets
  sysfs: CONFIG_SYSFS_DEPRECATED fix
  driver core: fix up Kconfig text for CONFIG_SYSFS_DEPRECATED
This commit is contained in:
Linus Torvalds 2008-03-04 16:37:35 -08:00
commit 2c6f2db13a
7 changed files with 39 additions and 116 deletions

View file

@ -621,7 +621,8 @@ static struct kobject *get_device_parent(struct device *dev,
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)
if (!glue_dir || !dev->class ||
glue_dir->kset != &dev->class->class_dirs)
return;
kobject_put(glue_dir);
@ -770,17 +771,10 @@ int device_add(struct device *dev)
struct class_interface *class_intf;
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)) {
error = -EINVAL;
goto Error;
goto Done;
}
pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__);
@ -843,11 +837,9 @@ 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->p->bus_notifier,

View file

@ -48,7 +48,6 @@
*/
LIST_HEAD(dpm_active);
static LIST_HEAD(dpm_locked);
static LIST_HEAD(dpm_off);
static LIST_HEAD(dpm_off_irq);
static LIST_HEAD(dpm_destroy);
@ -81,28 +80,6 @@ void device_pm_add(struct device *dev)
*/
void device_pm_remove(struct device *dev)
{
/*
* If this function is called during a suspend, it will be blocked,
* because we're holding the device's semaphore at that time, which may
* lead to a deadlock. In that case we want to print a warning.
* However, it may also be called by unregister_dropped_devices() with
* the device's semaphore released, in which case the warning should
* not be printed.
*/
if (down_trylock(&dev->sem)) {
if (down_read_trylock(&pm_sleep_rwsem)) {
/* No suspend in progress, wait on dev->sem */
down(&dev->sem);
up_read(&pm_sleep_rwsem);
} else {
/* Suspend in progress, we may deadlock */
dev_warn(dev, "Suspicious %s during suspend\n",
__FUNCTION__);
dump_stack();
/* The user has been warned ... */
down(&dev->sem);
}
}
pr_debug("PM: Removing info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
@ -110,7 +87,6 @@ void device_pm_remove(struct device *dev)
dpm_sysfs_remove(dev);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
up(&dev->sem);
}
/**
@ -230,6 +206,8 @@ static int resume_device(struct device *dev)
TRACE_DEVICE(dev);
TRACE_RESUME(0);
down(&dev->sem);
if (dev->bus && dev->bus->resume) {
dev_dbg(dev,"resuming\n");
error = dev->bus->resume(dev);
@ -245,6 +223,8 @@ static int resume_device(struct device *dev)
error = dev->class->resume(dev);
}
up(&dev->sem);
TRACE_RESUME(error);
return error;
}
@ -266,7 +246,7 @@ static void dpm_resume(void)
struct list_head *entry = dpm_off.next;
struct device *dev = to_device(entry);
list_move_tail(entry, &dpm_locked);
list_move_tail(entry, &dpm_active);
mutex_unlock(&dpm_list_mtx);
resume_device(dev);
mutex_lock(&dpm_list_mtx);
@ -274,25 +254,6 @@ static void dpm_resume(void)
mutex_unlock(&dpm_list_mtx);
}
/**
* unlock_all_devices - Release each device's semaphore
*
* Go through the dpm_off list. Put each device on the dpm_active
* list and unlock it.
*/
static void unlock_all_devices(void)
{
mutex_lock(&dpm_list_mtx);
while (!list_empty(&dpm_locked)) {
struct list_head *entry = dpm_locked.prev;
struct device *dev = to_device(entry);
list_move(entry, &dpm_active);
up(&dev->sem);
}
mutex_unlock(&dpm_list_mtx);
}
/**
* unregister_dropped_devices - Unregister devices scheduled for removal
*
@ -305,7 +266,6 @@ static void unregister_dropped_devices(void)
struct list_head *entry = dpm_destroy.next;
struct device *dev = to_device(entry);
up(&dev->sem);
mutex_unlock(&dpm_list_mtx);
/* This also removes the device from the list */
device_unregister(dev);
@ -324,7 +284,6 @@ void device_resume(void)
{
might_sleep();
dpm_resume();
unlock_all_devices();
unregister_dropped_devices();
up_write(&pm_sleep_rwsem);
}
@ -388,18 +347,15 @@ int device_power_down(pm_message_t state)
struct list_head *entry = dpm_off.prev;
struct device *dev = to_device(entry);
list_del_init(&dev->power.entry);
error = suspend_device_late(dev, state);
if (error) {
printk(KERN_ERR "Could not power down device %s: "
"error %d\n",
kobject_name(&dev->kobj), error);
if (list_empty(&dev->power.entry))
list_add(&dev->power.entry, &dpm_off);
break;
}
if (list_empty(&dev->power.entry))
list_add(&dev->power.entry, &dpm_off_irq);
if (!list_empty(&dev->power.entry))
list_move(&dev->power.entry, &dpm_off_irq);
}
if (!error)
@ -419,6 +375,8 @@ static int suspend_device(struct device *dev, pm_message_t state)
{
int error = 0;
down(&dev->sem);
if (dev->power.power_state.event) {
dev_dbg(dev, "PM: suspend %d-->%d\n",
dev->power.power_state.event, state.event);
@ -441,6 +399,9 @@ static int suspend_device(struct device *dev, pm_message_t state)
error = dev->bus->suspend(dev, state);
suspend_report_result(dev->bus->suspend, error);
}
up(&dev->sem);
return error;
}
@ -461,13 +422,13 @@ static int dpm_suspend(pm_message_t state)
int error = 0;
mutex_lock(&dpm_list_mtx);
while (!list_empty(&dpm_locked)) {
struct list_head *entry = dpm_locked.prev;
while (!list_empty(&dpm_active)) {
struct list_head *entry = dpm_active.prev;
struct device *dev = to_device(entry);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
error = suspend_device(dev, state);
mutex_lock(&dpm_list_mtx);
if (error) {
printk(KERN_ERR "Could not suspend device %s: "
"error %d%s\n",
@ -476,50 +437,16 @@ static int dpm_suspend(pm_message_t state)
(error == -EAGAIN ?
" (please convert to suspend_late)" :
""));
mutex_lock(&dpm_list_mtx);
if (list_empty(&dev->power.entry))
list_add(&dev->power.entry, &dpm_locked);
break;
}
mutex_lock(&dpm_list_mtx);
if (list_empty(&dev->power.entry))
list_add(&dev->power.entry, &dpm_off);
if (!list_empty(&dev->power.entry))
list_move(&dev->power.entry, &dpm_off);
}
mutex_unlock(&dpm_list_mtx);
return error;
}
/**
* lock_all_devices - Acquire every device's semaphore
*
* Go through the dpm_active list. Carefully lock each device's
* semaphore and put it in on the dpm_locked list.
*/
static void lock_all_devices(void)
{
mutex_lock(&dpm_list_mtx);
while (!list_empty(&dpm_active)) {
struct list_head *entry = dpm_active.next;
struct device *dev = to_device(entry);
/* Required locking order is dev->sem first,
* then dpm_list_mutex. Hence this awkward code.
*/
get_device(dev);
mutex_unlock(&dpm_list_mtx);
down(&dev->sem);
mutex_lock(&dpm_list_mtx);
if (list_empty(entry))
up(&dev->sem); /* Device was removed */
else
list_move_tail(entry, &dpm_locked);
put_device(dev);
}
mutex_unlock(&dpm_list_mtx);
}
/**
* device_suspend - Save state and stop all devices in system.
* @state: new power management state
@ -533,7 +460,6 @@ int device_suspend(pm_message_t state)
might_sleep();
down_write(&pm_sleep_rwsem);
lock_all_devices();
error = dpm_suspend(state);
if (error)
device_resume();

View file

@ -233,7 +233,7 @@ static int ksuspend_usb_init(void)
* singlethreaded. Its job doesn't justify running on more
* than one CPU.
*/
ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd");
ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd");
if (!ksuspend_usb_wq)
return -ENOMEM;
return 0;

View file

@ -29,10 +29,6 @@
#define DEBUGFS_MAGIC 0x64626720
/* declared over in file.c */
extern struct file_operations debugfs_file_operations;
extern struct inode_operations debugfs_link_operations;
static struct vfsmount *debugfs_mount;
static int debugfs_mount_count;

View file

@ -27,6 +27,11 @@ struct debugfs_blob_wrapper {
};
#if defined(CONFIG_DEBUG_FS)
/* declared over in file.c */
extern const struct file_operations debugfs_file_operations;
extern const struct inode_operations debugfs_link_operations;
struct dentry *debugfs_create_file(const char *name, mode_t mode,
struct dentry *parent, void *data,
const struct file_operations *fops);

View file

@ -382,9 +382,13 @@ config CGROUP_MEM_RES_CTLR
sure you need the memory resource controller.
config SYSFS_DEPRECATED
bool
config SYSFS_DEPRECATED_V2
bool "Create deprecated sysfs files"
depends on SYSFS
default y
select SYSFS_DEPRECATED
help
This option creates deprecated symlinks such as the
"device"-link, the <subsystem>:<name>-link, and the
@ -397,10 +401,11 @@ config SYSFS_DEPRECATED
If enabled, this option will also move any device structures
that belong to a class, back into the /sys/class hierarchy, in
order to support older versions of udev.
order to support older versions of udev and some userspace
programs.
If you are using a distro that was released in 2006 or later,
it should be safe to say N here.
If you are using a distro with the most recent userspace
packages, it should be safe to say N here.
config PROC_PID_CPUSET
bool "Include legacy /proc/<pid>/cpuset file"

View file

@ -153,6 +153,10 @@ static void kobject_init_internal(struct kobject *kobj)
return;
kref_init(&kobj->kref);
INIT_LIST_HEAD(&kobj->entry);
kobj->state_in_sysfs = 0;
kobj->state_add_uevent_sent = 0;
kobj->state_remove_uevent_sent = 0;
kobj->state_initialized = 1;
}
@ -289,13 +293,8 @@ void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
dump_stack();
}
kref_init(&kobj->kref);
INIT_LIST_HEAD(&kobj->entry);
kobject_init_internal(kobj);
kobj->ktype = ktype;
kobj->state_in_sysfs = 0;
kobj->state_add_uevent_sent = 0;
kobj->state_remove_uevent_sent = 0;
kobj->state_initialized = 1;
return;
error: