diff options
| author | Sebastian Capella <sebastian.capella@linaro.org> | 2014-02-18 17:52:08 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-06 22:06:29 -0800 |
| commit | e5b0fd691249908917e96659c03f2bc5869ed249 (patch) | |
| tree | ec3a5788fc43000be965c7b50325b891d1c6e514 /drivers/base | |
| parent | d8c2a97e20d1c4e726c21b2eac32a0258ff9ede0 (diff) | |
PM / hibernate: Fix restore hang in freeze_processes()
commit f8d5b9e9e5372f0deb7bc1ab1088a9b60b0a793d upstream.
During restore, pm_notifier chain are called with
PM_RESTORE_PREPARE. The firmware_class driver handler
fw_pm_notify does not have a handler for this. As a result,
it keeps a reader on the kmod.c umhelper_sem. During
freeze_processes, the call to __usermodehelper_disable tries to
take a write lock on this semaphore and hangs waiting.
Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/firmware_class.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index eb8fb94ae2c..e2b51f872b9 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -1541,6 +1541,7 @@ static int fw_pm_notify(struct notifier_block *notify_block, switch (mode) { case PM_HIBERNATION_PREPARE: case PM_SUSPEND_PREPARE: + case PM_RESTORE_PREPARE: kill_requests_without_uevent(); device_cache_fw_images(); break; |