linux-kernel - Re: [PATCH] pwm: atmel: remove redundant initialization of variable timeout

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Date:   Fri, 10 Dec 2021 09:02:15 +0000
From:   "Colin King (gmail)" <colin.i.king@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org, linux-pwm@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pwm: atmel: remove redundant initialization of variable
 timeout

On 10/12/2021 07:45, Uwe Kleine-König wrote:
> On Fri, Dec 10, 2021 at 12:22:50AM +0000, Colin Ian King wrote:
>> The variable timeout is being initialized with a value that is never
>> read, it is being re-assigned the same value later on. Remove the
>> redundant initialization and keep the latter assignment because it's
>> closer to the use of the variable.
>>
>> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
>> ---
>>   drivers/pwm/pwm-atmel.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
>> index 98b34ea9f38e..8e00a4286145 100644
>> --- a/drivers/pwm/pwm-atmel.c
>> +++ b/drivers/pwm/pwm-atmel.c
>> @@ -271,7 +271,7 @@ static void atmel_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm,
>>   			      bool disable_clk)
>>   {
>>   	struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
>> -	unsigned long timeout = jiffies + 2 * HZ;
>> +	unsigned long timeout;
>>   
>>   	atmel_pwm_wait_nonpending(atmel_pwm, pwm->hwpwm);
> 
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> Did you spot this by using some static checker? If so, maybe attribute
> it in the commit log?

Just clang.

> 
> Thanks
> Uwe
>