linux-kernel - Re: [PATCH] iio: ad_sigma_delta: use unsigned long for timeout

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Message-ID: <c07f288a40a3626d79a1b57173fa1a340afd3180.camel@analog.com>
Date:   Thu, 26 Jul 2018 11:44:52 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "hofrat@...dl.org" <hofrat@...dl.org>,
        "lars@...afoo.de" <lars@...afoo.de>
CC:     "knaack.h@....de" <knaack.h@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH] iio: ad_sigma_delta: use unsigned long for timeout

On Mon, 2018-07-23 at 11:18 +0200, Nicholas Mc Guire wrote:
> wait_for_completion_timeout returns unsigned long not int so an
> appropriate
> variable is declared and the assignment and check fixed up.
> 

Patch looks good.

Thanks for this

Alex

> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> ---
> 
> found by experimental coccinelle script
> 
> As the timeout returned is always << INT_MAX there is no side-effect with
> the
> type conversion here, never the less proper types should be used.
> 
> Patch was compile tested with: x86_64_defconfig + CONFIG_SPI=y,
> CONFIG_IIO=y,
> CONFIG_AD7793=y (implies CONFIG_AD_SIGMA_DELTA=y)
> 
> Patch is against 4.18-rc5 (localversion-next is next-20180720)
> 
>  drivers/iio/adc/ad_sigma_delta.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad_sigma_delta.c
> b/drivers/iio/adc/ad_sigma_delta.c
> index cf1b048..fc95107 100644
> --- a/drivers/iio/adc/ad_sigma_delta.c
> +++ b/drivers/iio/adc/ad_sigma_delta.c
> @@ -209,6 +209,7 @@ static int ad_sd_calibrate(struct ad_sigma_delta
> *sigma_delta,
>  	unsigned int mode, unsigned int channel)
>  {
>  	int ret;
> +	unsigned long timeout;
>  
>  	ret = ad_sigma_delta_set_channel(sigma_delta, channel);
>  	if (ret)
> @@ -224,8 +225,8 @@ static int ad_sd_calibrate(struct ad_sigma_delta
> *sigma_delta,
>  
>  	sigma_delta->irq_dis = false;
>  	enable_irq(sigma_delta->spi->irq);
> -	ret = wait_for_completion_timeout(&sigma_delta->completion,
> 2*HZ);
> -	if (ret == 0) {
> +	timeout = wait_for_completion_timeout(&sigma_delta->completion,
> 2 * HZ);
> +	if (timeout == 0) {
>  		sigma_delta->irq_dis = true;
>  		disable_irq_nosync(sigma_delta->spi->irq);
>  		ret = -EIO;