[PATCH 09/19] ALSA: firewire: isight: Use guard() for mutex locks

[Takashi Iwai <tiwai@suse.de>]

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@suse.de>
---
 sound/firewire/isight.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c
index ee574b5d7406..2b7f071d593b 100644
--- a/sound/firewire/isight.c
+++ b/sound/firewire/isight.c
@@ -327,9 +327,8 @@ static int isight_hw_free(struct snd_pcm_substream *substream)
 
 	WRITE_ONCE(isight->pcm_active, false);
 
-	mutex_lock(&isight->mutex);
+	guard(mutex)(&isight->mutex);
 	isight_stop_streaming(isight);
-	mutex_unlock(&isight->mutex);
 
 	return 0;
 }
@@ -400,16 +399,12 @@ static int isight_start_streaming(struct isight *isight)
 static int isight_prepare(struct snd_pcm_substream *substream)
 {
 	struct isight *isight = substream->private_data;
-	int err;
 
 	isight->buffer_pointer = 0;
 	isight->period_counter = 0;
 
-	mutex_lock(&isight->mutex);
-	err = isight_start_streaming(isight);
-	mutex_unlock(&isight->mutex);
-
-	return err;
+	guard(mutex)(&isight->mutex);
+	return isight_start_streaming(isight);
 }
 
 static int isight_trigger(struct snd_pcm_substream *substream, int cmd)
@@ -677,9 +672,8 @@ static void isight_bus_reset(struct fw_unit *unit)
 	if (fw_iso_resources_update(&isight->resources) < 0) {
 		isight_pcm_abort(isight);
 
-		mutex_lock(&isight->mutex);
+		guard(mutex)(&isight->mutex);
 		isight_stop_streaming(isight);
-		mutex_unlock(&isight->mutex);
 	}
 }
 
@@ -691,9 +685,9 @@ static void isight_remove(struct fw_unit *unit)
 
 	snd_card_disconnect(isight->card);
 
-	mutex_lock(&isight->mutex);
-	isight_stop_streaming(isight);
-	mutex_unlock(&isight->mutex);
+	scoped_guard(mutex, &isight->mutex) {
+		isight_stop_streaming(isight);
+	}
 
 	// Block till all of ALSA character devices are released.
 	snd_card_free(isight->card);
-- 
2.50.1