[PATCH v4 23/24] ASoC: codecs: cs48l32: Use guard() for mutex locks

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

Clean up the code using guard() for mutex locks.
Merely code refactoring, and no behavior change.

Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v2:
  Removed the unnecessary else block so update_bits() 
  is not called when no changes are needed. 

 sound/soc/codecs/cs48l32.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/sound/soc/codecs/cs48l32.c b/sound/soc/codecs/cs48l32.c
index 086ed0f57a85..a9967771124e 100644
--- a/sound/soc/codecs/cs48l32.c
+++ b/sound/soc/codecs/cs48l32.c
@@ -8,6 +8,7 @@
 #include <dt-bindings/sound/cs48l32.h>
 #include <linux/array_size.h>
 #include <linux/build_bug.h>
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/container_of.h>
 #include <linux/delay.h>
@@ -236,15 +237,13 @@ static int cs48l32_rate_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_v
 	int ret;
 
 	/* Prevent any mixer mux changes while we do this */
-	mutex_lock(&cs48l32_codec->rate_lock);
+	guard(mutex)(&cs48l32_codec->rate_lock);
 
 	/* The write must be guarded by a number of SYSCLK cycles */
 	cs48l32_spin_sysclk(cs48l32_codec);
 	ret = snd_soc_put_enum_double(kcontrol, ucontrol);
 	cs48l32_spin_sysclk(cs48l32_codec);
 
-	mutex_unlock(&cs48l32_codec->rate_lock);
-
 	return ret;
 }
 
@@ -2242,7 +2241,6 @@ static int cs48l32_dai_set_sysclk(struct snd_soc_dai *dai,
 	struct cs48l32_dai_priv *dai_priv = &cs48l32_codec->dai[dai->id - 1];
 	unsigned int base = dai->driver->base;
 	unsigned int current_asp_rate, target_asp_rate;
-	bool change_rate_domain = false;
 	int ret;
 
 	if (clk_id == dai_priv->clk)
@@ -2284,19 +2282,15 @@ static int cs48l32_dai_set_sysclk(struct snd_soc_dai *dai,
 
 		if ((current_asp_rate & CS48L32_ASP_RATE_MASK) !=
 		    (target_asp_rate & CS48L32_ASP_RATE_MASK)) {
-			change_rate_domain = true;
-
-			mutex_lock(&cs48l32_codec->rate_lock);
 			/* Guard the rate change with SYSCLK cycles */
-			cs48l32_spin_sysclk(cs48l32_codec);
-		}
-
-		snd_soc_component_update_bits(component, base + CS48L32_ASP_CONTROL1,
-					      CS48L32_ASP_RATE_MASK, target_asp_rate);
-
-		if (change_rate_domain) {
-			cs48l32_spin_sysclk(cs48l32_codec);
-			mutex_unlock(&cs48l32_codec->rate_lock);
+			scoped_guard(mutex, &cs48l32_codec->rate_lock) {
+				cs48l32_spin_sysclk(cs48l32_codec);
+				snd_soc_component_update_bits(component,
+							      base + CS48L32_ASP_CONTROL1,
+							      CS48L32_ASP_RATE_MASK,
+							      target_asp_rate);
+				cs48l32_spin_sysclk(cs48l32_codec);
+			}
 		}
 	}
 
-- 
2.43.0