From a6a1f3005929d1a7ed35d683ba4ce2a12aad7395 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 10 Feb 2016 11:53:30 +0100
Subject: [PATCH] ALSA: timer: Protect the whole snd_timer_close() with open
 race

commit 9984d1b5835ca29fc7025186a891ee7398d21cc7 upstream.

In order to make the open/close more robust, widen the register_mutex
protection over the whole snd_timer_close() function.  Also, the close
procedure is slightly shuffled to be in the safer order, as well as a
few code refactoring.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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