[PATCH 5.5 306/399] pwm: Remove set but not set variable pwm

From: Greg Kroah-Hartman
Date: Fri Feb 21 2020 - 03:41:35 EST

From: yu kuai <yukuai3@xxxxxxxxxx>

[ Upstream commit 9871abffc81048e20f02e15d6aa4558a44ad53ea ]

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

drivers/pwm/pwm-pca9685.c: In function âpca9685_pwm_gpio_freeâ:
drivers/pwm/pwm-pca9685.c:162:21: warning: variable âpwmâ 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 'pca->lock' can be removed since nothing will be done between

Fixes: e926b12c611c ("pwm: Clear chip_data in pwm_put()")
Signed-off-by: yu kuai <yukuai3@xxxxxxxxxx>
Acked-by: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 168684b02ebce..b07bdca3d510d 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);
- mutex_lock(&pca->lock);
- pwm = &pca->chip.pwms[offset];
- mutex_unlock(&pca->lock);

static int pca9685_pwm_gpio_get_direction(struct gpio_chip *chip,