linux-kernel - Re: [PATCH 1/8] iio: adc: ad_sigma_delta: use 'time_left' variable with wait_for_completion

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Message-ID: <1d9cdfa05150a389433aa399b44fcbcff5bed258.camel@gmail.com>
Date: Mon, 29 Apr 2024 14:06:05 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>, 
	linux-iio@...r.kernel.org
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
	 <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] iio: adc: ad_sigma_delta: use 'time_left' variable
 with wait_for_completion_timeout()

On Mon, 2024-04-29 at 13:33 +0200, Wolfram Sang wrote:
> There is a confusing pattern in the kernel to use a variable named 'timeout'
> to
> store the result of wait_for_completion_timeout() causing patterns like:
> 
> 	timeout = wait_for_completion_timeout(...)
> 	if (!timeout) return -ETIMEDOUT;
> 
> with all kinds of permutations. Use 'time_left' as a variable to make the code
> self explaining.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---

Reviewed-by: Nuno Sa <nuno.sa@...log.com>

>  drivers/iio/adc/ad_sigma_delta.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad_sigma_delta.c
> b/drivers/iio/adc/ad_sigma_delta.c
> index a602429cdde4..40ba6506bfc1 100644
> --- a/drivers/iio/adc/ad_sigma_delta.c
> +++ b/drivers/iio/adc/ad_sigma_delta.c
> @@ -206,7 +206,7 @@ int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta,
>  	unsigned int mode, unsigned int channel)
>  {
>  	int ret;
> -	unsigned long timeout;
> +	unsigned long time_left;
>  
>  	ret = ad_sigma_delta_set_channel(sigma_delta, channel);
>  	if (ret)
> @@ -223,8 +223,8 @@ int ad_sd_calibrate(struct ad_sigma_delta *sigma_delta,
>  
>  	sigma_delta->irq_dis = false;
>  	enable_irq(sigma_delta->spi->irq);
> -	timeout = wait_for_completion_timeout(&sigma_delta->completion, 2 *
> HZ);
> -	if (timeout == 0) {
> +	time_left = wait_for_completion_timeout(&sigma_delta->completion, 2 *
> HZ);
> +	if (time_left == 0) {
>  		sigma_delta->irq_dis = true;
>  		disable_irq_nosync(sigma_delta->spi->irq);
>  		ret = -EIO;