[PATCH 12/18] ALSA: sb: Use guard() for mutex locks

[Takashi Iwai <tiwai@xxxxxxx>]

Replace the manual mutex lock/unlock pairs with guard() for code
simplification.

Only code refactoring, and no behavior change.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/isa/sb/sb16_csp.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/sound/isa/sb/sb16_csp.c b/sound/isa/sb/sb16_csp.c
index 7034072c80d4..7c5072e4a96f 100644
--- a/sound/isa/sb/sb16_csp.c
+++ b/sound/isa/sb/sb16_csp.c
@@ -265,14 +265,10 @@ static int snd_sb_csp_release(struct snd_hwdep * hw, struct file *file)
  */
 static int snd_sb_csp_use(struct snd_sb_csp * p)
 {
-	mutex_lock(&p->access_mutex);
-	if (p->used) {
-		mutex_unlock(&p->access_mutex);
+	guard(mutex)(&p->access_mutex);
+	if (p->used)
 		return -EAGAIN;
-	}
 	p->used++;
-	mutex_unlock(&p->access_mutex);
-
 	return 0;
 
 }
@@ -282,10 +278,8 @@ static int snd_sb_csp_use(struct snd_sb_csp * p)
  */
 static int snd_sb_csp_unuse(struct snd_sb_csp * p)
 {
-	mutex_lock(&p->access_mutex);
+	guard(mutex)(&p->access_mutex);
 	p->used--;
-	mutex_unlock(&p->access_mutex);
-
 	return 0;
 }
 
-- 
2.50.1