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author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-03-05 00:37:35 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-03-05 00:37:35 (GMT) |
commit | 2c6f2db13a2428aa16f54f50232a589ddd5d7d01 (patch) | |
tree | f12c2f6ce3c6a541f5192aa5a2da400024015fb7 /drivers | |
parent | 12f981f9028da2402c236544c78b8378a278f830 (diff) | |
parent | 3634634edd49c115da931998b9540bcc17665b05 (diff) | |
download | linux-fsl-qoriq-2c6f2db13a2428aa16f54f50232a589ddd5d7d01.tar.xz |
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
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/base/core.c | 14 | ||||
-rw-r--r-- | drivers/base/power/main.c | 108 | ||||
-rw-r--r-- | drivers/usb/core/usb.c | 2 |
3 files changed, 21 insertions, 103 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 9c0070b..7de543d 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 ee9d1c8..d887d5c 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 f6f1990..1f0db51 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; |