linux-kernel - [PATCH 1/3] bebob: Fix a missing to unlock mutex in error handling case

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Date:	Tue, 22 Jul 2014 23:11:03 +0900
From:	Takashi Sakamoto <o-takashi@...amocchi.jp>
To:	clemens@...isch.de, tiwai@...e.de, perex@...ex.cz
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	darrena092@...il.com, weiyj_lk@....com
Subject: [PATCH 1/3] bebob: Fix a missing to unlock mutex in error handling case

In error handling case, special_clk_ctl_put() returns without unlock_mutex(),
therefore the mutex is still locked. This commit moves mutex_lock() after
the error handling case.

This commit is my solution for this post.

[PATCH -next] ALSA: bebob: Fix missing unlock on error in special_clk_ctl_put()
https://lkml.org/lkml/2014/7/20/12

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 sound/firewire/bebob/bebob_maudio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/firewire/bebob/bebob_maudio.c b/sound/firewire/bebob/bebob_maudio.c
index 6af50eb..fc470c6 100644
--- a/sound/firewire/bebob/bebob_maudio.c
+++ b/sound/firewire/bebob/bebob_maudio.c
@@ -379,12 +379,12 @@ static int special_clk_ctl_put(struct snd_kcontrol *kctl,
 	struct special_params *params = bebob->maudio_special_quirk;
 	int err, id;
 
-	mutex_lock(&bebob->mutex);
-
 	id = uval->value.enumerated.item[0];
 	if (id >= ARRAY_SIZE(special_clk_labels))
 		return 0;
 
+	mutex_lock(&bebob->mutex);
+
 	err = avc_maudio_set_special_clk(bebob, id,
 					 params->dig_in_fmt,
 					 params->dig_out_fmt,
-- 
1.9.1

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