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| author | Sebastian Capella <sebastian.capella@linaro.org> | 2014-02-19 01:52:08 (GMT) |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-05 16:13:55 (GMT) |
| commit | 3787169fa3185aa8587972b5fdccbf700f60a4f1 (patch) | |
| tree | f24803ec43b5cd42c95f092f47b02bc42cc24550 /drivers/base | |
| parent | 6e511735ceacf47932d0c123f786df7698a221b8 (diff) | |
| download | linux-fsl-qoriq-3787169fa3185aa8587972b5fdccbf700f60a4f1.tar.xz | |
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: Jiri Slaby <jslaby@suse.cz>
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 10a4467..701212b 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -1529,6 +1529,7 @@ 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; |