linux-kernel - [PATCH] watchdog: mena21_wdt: Drop unnecessary mutex lock

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Date:   Tue,  8 May 2018 15:12:06 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     morbidrsa@...il.com, wim@...ux-watchdog.org, linux@...ck-us.net
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] watchdog: mena21_wdt: Drop unnecessary mutex lock

There is already a mutex in the watchdog core which serializes
calls to the various API functions. 
So the mutex lock "drv->lock" is unnecessary and can be dropped.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/watchdog/mena21_wdt.c | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/drivers/watchdog/mena21_wdt.c b/drivers/watchdog/mena21_wdt.c
index 25d5d2b8cfbe..0be7f50e8ff9 100644
--- a/drivers/watchdog/mena21_wdt.c
+++ b/drivers/watchdog/mena21_wdt.c
@@ -31,7 +31,6 @@ enum a21_wdt_gpios {
 
 struct a21_wdt_drv {
 	struct watchdog_device wdt;
-	struct mutex lock;
 	unsigned gpios[NUM_GPIOS];
 };
 
@@ -55,12 +54,8 @@ static int a21_wdt_start(struct watchdog_device *wdt)
 {
 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
 
-	mutex_lock(&drv->lock);
-
 	gpio_set_value(drv->gpios[GPIO_WD_ENAB], 1);
 
-	mutex_unlock(&drv->lock);
-
 	return 0;
 }
 
@@ -68,12 +63,8 @@ static int a21_wdt_stop(struct watchdog_device *wdt)
 {
 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
 
-	mutex_lock(&drv->lock);
-
 	gpio_set_value(drv->gpios[GPIO_WD_ENAB], 0);
 
-	mutex_unlock(&drv->lock);
-
 	return 0;
 }
 
@@ -81,14 +72,10 @@ static int a21_wdt_ping(struct watchdog_device *wdt)
 {
 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
 
-	mutex_lock(&drv->lock);
-
 	gpio_set_value(drv->gpios[GPIO_WD_TRIG], 0);
 	ndelay(10);
 	gpio_set_value(drv->gpios[GPIO_WD_TRIG], 1);
 
-	mutex_unlock(&drv->lock);
-
 	return 0;
 }
 
@@ -108,8 +95,6 @@ static int a21_wdt_set_timeout(struct watchdog_device *wdt,
 		return -EINVAL;
 	}
 
-	mutex_lock(&drv->lock);
-
 	if (timeout == 1)
 		gpio_set_value(drv->gpios[GPIO_WD_FAST], 1);
 	else
@@ -117,8 +102,6 @@ static int a21_wdt_set_timeout(struct watchdog_device *wdt,
 
 	wdt->timeout = timeout;
 
-	mutex_unlock(&drv->lock);
-
 	return 0;
 }
 
@@ -191,7 +174,6 @@ static int a21_wdt_probe(struct platform_device *pdev)
 			return ret;
 	}
 
-	mutex_init(&drv->lock);
 	watchdog_init_timeout(&a21_wdt, 30, &pdev->dev);
 	watchdog_set_nowayout(&a21_wdt, nowayout);
 	watchdog_set_drvdata(&a21_wdt, drv);
-- 
2.17.0