[PATCH RFC v1 2/3] Fix hibernation restore hang in freeze_processes

Ming Lei ming.lei at canonical.com
Mon Feb 24 02:09:38 EST 2014

On Wed, Feb 19, 2014 at 9:52 AM, Sebastian Capella
<sebastian.capella at linaro.org> wrote:
> 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 at linaro.org>
> Cc: Russ Dill <Russ.Dill at ti.com>
> Cc: Ming Lei <ming.lei at canonical.com>
> Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

Acked-by: Ming Lei <ming.lei at canonical.com>

Ming Lei

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