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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:37:35 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:37:35 -0800
commit2c6f2db13a2428aa16f54f50232a589ddd5d7d01 (patch)
treef12c2f6ce3c6a541f5192aa5a2da400024015fb7
parent12f981f9028da2402c236544c78b8378a278f830 (diff)
parent3634634edd49c115da931998b9540bcc17665b05 (diff)
downloadkernel-2c6f2db13a2428aa16f54f50232a589ddd5d7d01.tar.gz
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
-rw-r--r--drivers/base/core.c14
-rw-r--r--drivers/base/power/main.c108
-rw-r--r--drivers/usb/core/usb.c2
-rw-r--r--fs/debugfs/inode.c4
-rw-r--r--include/linux/debugfs.h5
-rw-r--r--init/Kconfig11
-rw-r--r--lib/kobject.c11
7 files changed, 39 insertions, 116 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 9c0070b5bd3e..7de543d1d0b4 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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,
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index ee9d1c8db0d6..d887d5cb5bef 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -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);
@@ -275,25 +255,6 @@ static void dpm_resume(void)
}
/**
- * 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
*
* Unregister all devices on the dpm_destroy list.
@@ -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",
@@ -476,14 +437,10 @@ 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);
@@ -491,36 +448,6 @@ static int dpm_suspend(pm_message_t state)
}
/**
- * 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();
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index f6f19908f5f0..1f0db51190cc 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -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;
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index d26e2826ba5b..e9602d85c11d 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -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;
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index f592d6de3b97..7266124361b4 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -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);
diff --git a/init/Kconfig b/init/Kconfig
index 442850b984be..074ac97f55e3 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -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"
diff --git a/lib/kobject.c b/lib/kobject.c
index d784daeb8571..0d03252f87a8 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -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: