[PATCH V2] pwm: remove set but not set variable 'pwm'

[PATCH V2] pwm: remove set but not set variable 'pwm'

[yu kuai]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/pwm/pwm-pca9685.c: In function ‘pca9685_pwm_gpio_free’:
drivers/pwm/pwm-pca9685.c:162:21: warning: variable ‘pwm’ set but
not used [-Wunused-but-set-variable]

It is never used, and so can be removed. In that case, hold and release
the lock 'pac->lock' can be removed since nothing will be done between
them.

Fixes: e926b12c611c ("pwm: Clear chip_data in pwm_put()")
Signed-off-by: yu kuai <yukuai3@huawei.com>
---
Changes in V2:
 Add Fixes and some commit message about dropping the lock 'pca->loc'.

 drivers/pwm/pwm-pca9685.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index 168684b02ebc..b07bdca3d510 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -159,13 +159,9 @@ static void pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
 static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
 {
 	struct pca9685 *pca = gpiochip_get_data(gpio);
-	struct pwm_device *pwm;
 
 	pca9685_pwm_gpio_set(gpio, offset, 0);
 	pm_runtime_put(pca->chip.dev);
-	mutex_lock(&pca->lock);
-	pwm = &pca->chip.pwms[offset];
-	mutex_unlock(&pca->lock);
 }
 
 static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip,
-- 
2.17.2

[PATCH V2] pwm: remove set but not set variable 'pwm'

[yu kuai]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/pwm/pwm-pca9685.c: In function ‘pca9685_pwm_gpio_free’:
drivers/pwm/pwm-pca9685.c:162:21: warning: variable ‘pwm’ set but
not used [-Wunused-but-set-variable]

It is never used, and so can be removed. In that case, hold and release
the lock 'pac->lock' can be removed since nothing will be done between
them.

Fixes: e926b12c611c ("pwm: Clear chip_data in pwm_put()")
Signed-off-by: yu kuai <yukuai3@huawei.com>
---
Changes in V2:
 Add Fixes and some commit message about dropping the lock 'pca->loc'.

 drivers/pwm/pwm-pca9685.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index 168684b02ebc..b07bdca3d510 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -159,13 +159,9 @@ static void pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
 static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
 {
 	struct pca9685 *pca = gpiochip_get_data(gpio);
-	struct pwm_device *pwm;
 
 	pca9685_pwm_gpio_set(gpio, offset, 0);
 	pm_runtime_put(pca->chip.dev);
-	mutex_lock(&pca->lock);
-	pwm = &pca->chip.pwms[offset];
-	mutex_unlock(&pca->lock);
 }
 
 static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip,
-- 
2.17.2

Re: [PATCH V2] pwm: remove set but not set variable 'pwm'

[Uwe Kleine-König]

On Mon, Jan 20, 2020 at 07:51:43PM +0800, yu kuai wrote:
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> drivers/pwm/pwm-pca9685.c: In function ‘pca9685_pwm_gpio_free’:
> drivers/pwm/pwm-pca9685.c:162:21: warning: variable ‘pwm’ set but
> not used [-Wunused-but-set-variable]
> 
> It is never used, and so can be removed. In that case, hold and release
> the lock 'pac->lock' can be removed since nothing will be done between
> them.
> 
> Fixes: e926b12c611c ("pwm: Clear chip_data in pwm_put()")
> Signed-off-by: yu kuai <yukuai3@huawei.com>

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Best regards
Uwe

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