6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mingwei Zheng zmw12306@gmail.com
[ Upstream commit cce16e7f6216227964cda25f5f23634bce2c500f ]
Add check for the return value of clk_enable() to catch the potential error. We used APP-Miner to find it.
Fixes: e70a540b4e02 ("pwm: Add STM32 LPTimer PWM driver") Signed-off-by: Mingwei Zheng zmw12306@gmail.com Signed-off-by: Jiasheng Jiang jiashengjiangcool@gmail.com Link: https://lore.kernel.org/r/20241206215318.3402860-1-zmw12306@gmail.com Signed-off-by: Uwe Kleine-König ukleinek@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pwm/pwm-stm32-lp.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c index bb3a045a73343..7799258638dfa 100644 --- a/drivers/pwm/pwm-stm32-lp.c +++ b/drivers/pwm/pwm-stm32-lp.c @@ -168,8 +168,12 @@ static int stm32_pwm_lp_get_state(struct pwm_chip *chip, regmap_read(priv->regmap, STM32_LPTIM_CR, &val); state->enabled = !!FIELD_GET(STM32_LPTIM_ENABLE, val); /* Keep PWM counter clock refcount in sync with PWM initial state */ - if (state->enabled) - clk_enable(priv->clk); + if (state->enabled) { + int ret = clk_enable(priv->clk); + + if (ret) + return ret; + }
regmap_read(priv->regmap, STM32_LPTIM_CFGR, &val); presc = FIELD_GET(STM32_LPTIM_PRESC, val);