diff options
| -rw-r--r-- | Documentation/power/notifiers.txt | 8 | ||||
| -rw-r--r-- | include/linux/notifier.h | 2 | ||||
| -rw-r--r-- | kernel/power/disk.c | 5 | ||||
| -rw-r--r-- | kernel/power/user.c | 31 |
4 files changed, 34 insertions, 12 deletions
diff --git a/Documentation/power/notifiers.txt b/Documentation/power/notifiers.txt index 9293e4b..ae1b7ec 100644 --- a/Documentation/power/notifiers.txt +++ b/Documentation/power/notifiers.txt @@ -28,6 +28,14 @@ PM_POST_HIBERNATION The system memory state has been restored from a hibernation. Device drivers' .resume() callbacks have been executed and tasks have been thawed. +PM_RESTORE_PREPARE The system is going to restore a hibernation image. + If all goes well the restored kernel will issue a + PM_POST_HIBERNATION notification. + +PM_POST_RESTORE An error occurred during the hibernation restore. + Device drivers' .resume() callbacks have been executed + and tasks have been thawed. + PM_SUSPEND_PREPARE The system is preparing for a suspend. PM_POST_SUSPEND The system has just resumed or an error occured during diff --git a/include/linux/notifier.h b/include/linux/notifier.h index 5dfbc68..f4df400 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h @@ -228,6 +228,8 @@ static inline int notifier_to_errno(int ret) #define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */ #define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */ #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ +#define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ +#define PM_POST_RESTORE 0x0006 /* Restore failed */ /* Console keyboard events. * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and diff --git a/kernel/power/disk.c b/kernel/power/disk.c index b138b43..6597365 100644 --- a/kernel/power/disk.c +++ b/kernel/power/disk.c @@ -499,6 +499,10 @@ static int software_resume(void) goto Unlock; } + error = pm_notifier_call_chain(PM_RESTORE_PREPARE); + if (error) + goto Finish; + error = create_basic_memory_bitmaps(); if (error) goto Finish; @@ -522,6 +526,7 @@ static int software_resume(void) Done: free_basic_memory_bitmaps(); Finish: + pm_notifier_call_chain(PM_POST_RESTORE); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: diff --git a/kernel/power/user.c b/kernel/power/user.c index b902a7e..f5512cb 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -67,6 +67,7 @@ atomic_t snapshot_device_available = ATOMIC_INIT(1); static int snapshot_open(struct inode *inode, struct file *filp) { struct snapshot_data *data; + int error; if (!atomic_add_unless(&snapshot_device_available, -1, 0)) return -EBUSY; @@ -87,9 +88,19 @@ static int snapshot_open(struct inode *inode, struct file *filp) data->swap = swsusp_resume_device ? swap_type_of(swsusp_resume_device, 0, NULL) : -1; data->mode = O_RDONLY; + error = pm_notifier_call_chain(PM_RESTORE_PREPARE); + if (error) + pm_notifier_call_chain(PM_POST_RESTORE); } else { data->swap = -1; data->mode = O_WRONLY; + error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); + if (error) + pm_notifier_call_chain(PM_POST_HIBERNATION); + } + if (error) { + atomic_inc(&snapshot_device_available); + return error; } data->frozen = 0; data->ready = 0; @@ -111,6 +122,8 @@ static int snapshot_release(struct inode *inode, struct file *filp) thaw_processes(); mutex_unlock(&pm_mutex); } + pm_notifier_call_chain(data->mode == O_WRONLY ? + PM_POST_HIBERNATION : PM_POST_RESTORE); atomic_inc(&snapshot_device_available); return 0; } @@ -174,18 +187,13 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, if (data->frozen) break; mutex_lock(&pm_mutex); - error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); - if (!error) { - printk("Syncing filesystems ... "); - sys_sync(); - printk("done.\n"); - - error = freeze_processes(); - if (error) - thaw_processes(); - } + printk("Syncing filesystems ... "); + sys_sync(); + printk("done.\n"); + + error = freeze_processes(); if (error) - pm_notifier_call_chain(PM_POST_HIBERNATION); + thaw_processes(); mutex_unlock(&pm_mutex); if (!error) data->frozen = 1; @@ -196,7 +204,6 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, break; mutex_lock(&pm_mutex); thaw_processes(); - pm_notifier_call_chain(PM_POST_HIBERNATION); mutex_unlock(&pm_mutex); data->frozen = 0; break; |
