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| author | Lianwei Wang <lianwei.wang@gmail.com> | 2016-06-19 23:52:27 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-06-28 00:38:55 +0200 |
| commit | ea00f4f4f00cc2bc3b63ad512a4e6df3b20832b9 (patch) | |
| tree | 148dbab1f94bc7dd515c6ddda12f85bae310dd4f /kernel/power/user.c | |
| parent | ca5f2b4c4fb7bb7397317ee2ead83485aa295a3e (diff) | |
| download | linux-ea00f4f4f00cc2bc3b63ad512a4e6df3b20832b9.tar.bz2 | |
PM / sleep: make PM notifiers called symmetrically
This makes pm notifier PREPARE/POST symmetrical: if PREPARE
fails, we will only undo what ever happened on PREPARE.
It fixes the unbalanced CPU hotplug enable in CPU PM notifier.
Signed-off-by: Lianwei Wang <lianwei.wang@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power/user.c')
| -rw-r--r-- | kernel/power/user.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c index 526e8911460a..35310b627388 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -47,7 +47,7 @@ atomic_t snapshot_device_available = ATOMIC_INIT(1); static int snapshot_open(struct inode *inode, struct file *filp) { struct snapshot_data *data; - int error; + int error, nr_calls = 0; if (!hibernation_available()) return -EPERM; @@ -74,9 +74,9 @@ static int snapshot_open(struct inode *inode, struct file *filp) swap_type_of(swsusp_resume_device, 0, NULL) : -1; data->mode = O_RDONLY; data->free_bitmaps = false; - error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); + error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); if (error) - pm_notifier_call_chain(PM_POST_HIBERNATION); + __pm_notifier_call_chain(PM_POST_HIBERNATION, --nr_calls, NULL); } else { /* * Resuming. We may need to wait for the image device to @@ -86,13 +86,15 @@ static int snapshot_open(struct inode *inode, struct file *filp) data->swap = -1; data->mode = O_WRONLY; - error = pm_notifier_call_chain(PM_RESTORE_PREPARE); + error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); if (!error) { error = create_basic_memory_bitmaps(); data->free_bitmaps = !error; - } + } else + nr_calls--; + if (error) - pm_notifier_call_chain(PM_POST_RESTORE); + __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); } if (error) atomic_inc(&snapshot_device_available); |