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[media] v4l: async: Make it safe to unregister unregistered notifier
authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Wed, 3 Jul 2013 10:49:06 +0000 (07:49 -0300)
committerMauro Carvalho Chehab <m.chehab@samsung.com>
Sun, 18 Aug 2013 11:49:33 +0000 (08:49 -0300)
Calling v4l2_async_notifier_unregister() on a notifier that hasn't been
registered leads to a crash. To simplify drivers, make it safe to
unregister a notifier that has not been registered.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

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