On Wed, 25 Jan 2017, Arnd Bergmann wrote:
> The stm32_pwm_apply randomly sets the polarity or doesn't,
> as pointed out by this gcc warning:
>
> drivers/pwm/pwm-stm32.c: In function 'stm32_pwm_apply':
> drivers/pwm/pwm-stm32.c:204:33: error: 'curstate.polarity' may be used
> uninitialized in this function [-Werror=maybe-uninitialized]
>
> I assume it was meant to compare the new state to the current
> state rather than an uninitialized stack variable, so let's
> do that instead.
>
> Fixes: bafffb6e7bd1 ("pwm: Add driver for STM32 plaftorm")
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> drivers/pwm/pwm-stm32.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
Fix from the author already applied.
> diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
> index ce6232ebefe1..6139512aab7b 100644
> --- a/drivers/pwm/pwm-stm32.c
> +++ b/drivers/pwm/pwm-stm32.c
> @@ -189,7 +189,6 @@ static void stm32_pwm_disable(struct stm32_pwm *priv, int
> ch)
> static int stm32_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
> struct pwm_state *state)
> {
> - struct pwm_state curstate;
> bool enabled;
> struct stm32_pwm *priv = to_stm32_pwm_dev(chip);
> int ret;
> @@ -201,7 +200,7 @@ static int stm32_pwm_apply(struct pwm_chip *chip, struct
> pwm_device *pwm,
> return 0;
> }
>
> - if (state->polarity != curstate.polarity)
> + if (state->polarity != pwm->state.polarity)
> stm32_pwm_set_polarity(priv, pwm->hwpwm, state->polarity);
>
> ret = stm32_pwm_config(priv, pwm->hwpwm,
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
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