[PATCH v2 03/24] ASoC: codecs: arizona-jack: Use guard() cleanup helpers

[phucduc.bui@gmail.com]

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

Clean up the code using guard() helpers for mutex locking
and PM runtime management.
No functional change intended.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v2:
 Reworked the code to use an if/else structure, 
 avoiding code duplication after removing the goto label.

 sound/soc/codecs/arizona-jack.c | 116 +++++++++++++++-----------------
 1 file changed, 53 insertions(+), 63 deletions(-)

diff --git a/sound/soc/codecs/arizona-jack.c b/sound/soc/codecs/arizona-jack.c
index a9063bac2752..7ea8112e0d79 100644
--- a/sound/soc/codecs/arizona-jack.c
+++ b/sound/soc/codecs/arizona-jack.c
@@ -5,6 +5,7 @@
  *  Copyright (C) 2012-2014 Wolfson Microelectronics plc
  */
 
+#include <linux/cleanup.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -707,15 +708,13 @@ static void arizona_micd_timeout_work(struct work_struct *work)
 						struct arizona_priv,
 						micd_timeout_work.work);
 
-	mutex_lock(&info->lock);
+	guard(mutex)(&info->lock);
 
 	dev_dbg(info->arizona->dev, "MICD timed out, reporting HP\n");
 
 	info->detecting = false;
 
 	arizona_identify_headphone(info);
-
-	mutex_unlock(&info->lock);
 }
 
 static int arizona_micd_adc_read(struct arizona_priv *info)
@@ -921,12 +920,11 @@ static void arizona_micd_detect(struct work_struct *work)
 
 	cancel_delayed_work_sync(&info->micd_timeout_work);
 
-	mutex_lock(&info->lock);
+	guard(mutex)(&info->lock);
 
 	/* If the cable was removed while measuring ignore the result */
 	if (!(info->jack->status & SND_JACK_MECHANICAL)) {
 		dev_dbg(arizona->dev, "Ignoring MICDET for removed cable\n");
-		mutex_unlock(&info->lock);
 		return;
 	}
 
@@ -936,7 +934,6 @@ static void arizona_micd_detect(struct work_struct *work)
 		arizona_button_reading(info);
 
 	pm_runtime_mark_last_busy(arizona->dev);
-	mutex_unlock(&info->lock);
 }
 
 static irqreturn_t arizona_micdet(int irq, void *data)
@@ -948,10 +945,10 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 	cancel_delayed_work_sync(&info->micd_detect_work);
 	cancel_delayed_work_sync(&info->micd_timeout_work);
 
-	mutex_lock(&info->lock);
-	if (!info->detecting)
-		debounce = 0;
-	mutex_unlock(&info->lock);
+	scoped_guard(mutex, &info->lock) {
+		if (!info->detecting)
+			debounce = 0;
+	}
 
 	if (debounce)
 		queue_delayed_work(system_power_efficient_wq,
@@ -969,9 +966,8 @@ static void arizona_hpdet_work(struct work_struct *work)
 						struct arizona_priv,
 						hpdet_work.work);
 
-	mutex_lock(&info->lock);
+	guard(mutex)(&info->lock);
 	arizona_start_hpdet_acc_id(info);
-	mutex_unlock(&info->lock);
 }
 
 static int arizona_hpdet_wait(struct arizona_priv *info)
@@ -1018,9 +1014,9 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
 	cancelled_hp = cancel_delayed_work_sync(&info->hpdet_work);
 	cancelled_mic = cancel_delayed_work_sync(&info->micd_timeout_work);
 
-	pm_runtime_get_sync(arizona->dev);
+	guard(pm_runtime_active_auto)(arizona->dev);
 
-	mutex_lock(&info->lock);
+	guard(mutex)(&info->lock);
 
 	if (info->micd_clamp) {
 		mask = ARIZONA_MICD_CLAMP_STS;
@@ -1036,8 +1032,6 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
 	ret = regmap_read(arizona->regmap, ARIZONA_AOD_IRQ_RAW_STATUS, &val);
 	if (ret) {
 		dev_err(arizona->dev, "Failed to read jackdet status: %d\n", ret);
-		mutex_unlock(&info->lock);
-		pm_runtime_put_autosuspend(arizona->dev);
 		return IRQ_NONE;
 	}
 
@@ -1056,62 +1050,61 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
 					   &info->micd_timeout_work,
 					   msecs_to_jiffies(micd_timeout));
 		}
+	} else {
+		info->last_jackdet = val;
 
-		goto out;
-	}
-	info->last_jackdet = val;
+		if (info->last_jackdet == present) {
+			dev_dbg(arizona->dev, "Detected jack\n");
+			snd_soc_jack_report(info->jack, SND_JACK_MECHANICAL, SND_JACK_MECHANICAL);
 
-	if (info->last_jackdet == present) {
-		dev_dbg(arizona->dev, "Detected jack\n");
-		snd_soc_jack_report(info->jack, SND_JACK_MECHANICAL, SND_JACK_MECHANICAL);
+			info->detecting = true;
+			info->mic = false;
+			info->jack_flips = 0;
 
-		info->detecting = true;
-		info->mic = false;
-		info->jack_flips = 0;
+			if (!arizona->pdata.hpdet_acc_id) {
+				arizona_start_mic(info);
+			} else {
+				queue_delayed_work(system_power_efficient_wq,
+						   &info->hpdet_work,
+						   msecs_to_jiffies(HPDET_DEBOUNCE));
+			}
 
-		if (!arizona->pdata.hpdet_acc_id) {
-			arizona_start_mic(info);
+			if (info->micd_clamp || !arizona->pdata.jd_invert)
+				regmap_update_bits(arizona->regmap,
+						   ARIZONA_JACK_DETECT_DEBOUNCE,
+						   ARIZONA_MICD_CLAMP_DB |
+						   ARIZONA_JD1_DB, 0);
 		} else {
-			queue_delayed_work(system_power_efficient_wq,
-					   &info->hpdet_work,
-					   msecs_to_jiffies(HPDET_DEBOUNCE));
-		}
+			dev_dbg(arizona->dev, "Detected jack removal\n");
 
-		if (info->micd_clamp || !arizona->pdata.jd_invert)
-			regmap_update_bits(arizona->regmap,
-					   ARIZONA_JACK_DETECT_DEBOUNCE,
-					   ARIZONA_MICD_CLAMP_DB |
-					   ARIZONA_JD1_DB, 0);
-	} else {
-		dev_dbg(arizona->dev, "Detected jack removal\n");
+			arizona_stop_mic(info);
 
-		arizona_stop_mic(info);
+			info->num_hpdet_res = 0;
+			for (i = 0; i < ARRAY_SIZE(info->hpdet_res); i++)
+				info->hpdet_res[i] = 0;
+			info->mic = false;
+			info->hpdet_done = false;
+			info->hpdet_retried = false;
 
-		info->num_hpdet_res = 0;
-		for (i = 0; i < ARRAY_SIZE(info->hpdet_res); i++)
-			info->hpdet_res[i] = 0;
-		info->mic = false;
-		info->hpdet_done = false;
-		info->hpdet_retried = false;
+			snd_soc_jack_report(info->jack, 0,
+					    ARIZONA_JACK_MASK | info->micd_button_mask);
 
-		snd_soc_jack_report(info->jack, 0, ARIZONA_JACK_MASK | info->micd_button_mask);
+			/*
+			 * If the jack was removed during a headphone detection we
+			 * need to wait for the headphone detection to finish, as
+			 * it can not be aborted. We don't want to be able to start
+			 * a new headphone detection from a fresh insert until this
+			 * one is finished.
+			 */
+			arizona_hpdet_wait(info);
 
-		/*
-		 * If the jack was removed during a headphone detection we
-		 * need to wait for the headphone detection to finish, as
-		 * it can not be aborted. We don't want to be able to start
-		 * a new headphone detection from a fresh insert until this
-		 * one is finished.
-		 */
-		arizona_hpdet_wait(info);
-
-		regmap_update_bits(arizona->regmap,
-				   ARIZONA_JACK_DETECT_DEBOUNCE,
-				   ARIZONA_MICD_CLAMP_DB | ARIZONA_JD1_DB,
-				   ARIZONA_MICD_CLAMP_DB | ARIZONA_JD1_DB);
+			regmap_update_bits(arizona->regmap,
+					   ARIZONA_JACK_DETECT_DEBOUNCE,
+					   ARIZONA_MICD_CLAMP_DB | ARIZONA_JD1_DB,
+					   ARIZONA_MICD_CLAMP_DB | ARIZONA_JD1_DB);
+		}
 	}
 
-out:
 	/* Clear trig_sts to make sure DCVDD is not forced up */
 	regmap_write(arizona->regmap, ARIZONA_AOD_WKUP_AND_TRIG,
 		     ARIZONA_MICD_CLAMP_FALL_TRIG_STS |
@@ -1119,9 +1112,6 @@ static irqreturn_t arizona_jackdet(int irq, void *data)
 		     ARIZONA_JD1_FALL_TRIG_STS |
 		     ARIZONA_JD1_RISE_TRIG_STS);
 
-	mutex_unlock(&info->lock);
-
-	pm_runtime_put_autosuspend(arizona->dev);
 
 	return IRQ_HANDLED;
 }
-- 
2.43.0