Messages in this thread Patch in this message |  | | From | Sebastian Capella <> | Subject | [PATCH v2 2/3] Fix hibernation restore hang in freeze_processes | Date | Mon, 24 Feb 2014 16:27:38 -0800 |
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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> Cc: Russ Dill <Russ.Dill@ti.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/base/firmware_class.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index eb8fb94..e2b51f8 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; -- 1.7.9.5
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