[PATCH] pwm: stm32-lp: Add check for clk_enable()

[Mingwei Zheng]

> On Dec 5, 2024, at 3:34 AM, Uwe Kleine-König <ukleinek at kernel.org> wrote:
> 
> On Thu, Dec 05, 2024 at 12:17:46AM -0500, Mingwei Zheng wrote:
>> Add check for the return value of clk_enable() to catch the potential
>> error.
> 
> Is this something that you actually hit, or just a janitoral fix you
> noticed while browsing the code (or reading some checker output)?

We detected this through static analysis, instead of actually hit.

> 
>> Fixes: e70a540b4e02 ("pwm: Add STM32 LPTimer PWM driver")
>> Signed-off-by: Mingwei Zheng <zmw12306 at gmail.com>
>> Signed-off-by: Jiasheng Jiang <jiashengjiangcool at gmail.com>
>> ---
>> 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 989731256f50..4abef304417d 100644
>> --- a/drivers/pwm/pwm-stm32-lp.c
>> +++ b/drivers/pwm/pwm-stm32-lp.c
>> @@ -163,12 +163,16 @@ static int stm32_pwm_lp_get_state(struct pwm_chip *chip,
>> unsigned long rate = clk_get_rate(priv->clk);
>> u32 val, presc, prd;
>> u64 tmp;
>> + int ret;
> 
> Please move this variable to the block where it's used. No need for such
> a big scope.
> 
> Otherwise looks fine.
> 
> Best regards
> Uwe

Thank you! We will submit a v2 patch for you to review!

Best,
Mingwei