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authorAlan Stern <stern@rowland.harvard.edu>2007-11-19 23:38:25 +0100
committerLen Brown <len.brown@intel.com>2008-02-01 18:30:53 -0500
commitc3e94d899c864e558f938f9845ddb8c2e5d5ccd0 (patch)
treecdc2d5007e2d8053ab1903f9e66c46dca9a9de81 /kernel
parent2f8ed1c60b06b797bf79a1dc540f0bed8c9d75a0 (diff)
downloadlinaro-lsk-c3e94d899c864e558f938f9845ddb8c2e5d5ccd0.tar.gz
Hibernation: Add PM_RESTORE_PREPARE and PM_POST_RESTORE notifiers (rev. 2)
Add PM_RESTORE_PREPARE and PM_POST_RESTORE notifiers to the PM core, to be used in analogy with the existing PM_HIBERNATION_PREPARE and PM_POST_HIBERNATION notifiers. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/disk.c5
-rw-r--r--kernel/power/user.c31
2 files changed, 24 insertions, 12 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index b138b431e27..65973650823 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 b902a7e3bd1..f5512cb3aa8 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;