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    SubjectRe: [PATCH AUTOSEL 5.5 418/542] pwm: Remove set but not set variable 'pwm'
    Hello Sasha,

    On Fri, Feb 14, 2020 at 10:46:50AM -0500, Sasha Levin wrote:
    > From: yu kuai <yukuai3@huawei.com>
    >
    > [ Upstream commit 9871abffc81048e20f02e15d6aa4558a44ad53ea ]
    >
    > 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 'pca->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>
    > Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
    > Signed-off-by: Sasha Levin <sashal@kernel.org>
    > ---
    > 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);
    > pm_runtime_put(pca->chip.dev);
    > - mutex_lock(&pca->lock);
    > - pwm = &pca->chip.pwms[offset];
    > - mutex_unlock(&pca->lock);

    Even though I bet this change won't introduce a regression, it only
    fixes a harmless warning. So I wonder if it objectively qualifies to be
    applied for stable.

    Best regards
    Uwe

    --
    Pengutronix e.K. | Uwe Kleine-König |
    Industrial Linux Solutions | https://www.pengutronix.de/ |

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