linux-kernel - Re: [PATCH] iio: ad9523: fix a missing check of return value

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Date:   Sat, 22 Dec 2018 17:34:54 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: ad9523: fix a missing check of return value

On Thu, 20 Dec 2018 01:21:22 -0600
Kangjie Lu <kjlu@....edu> wrote:

> If ad9523_write() fails, indio_dev may get incorrect data. The fix
> inserts a check for the return value of ad9523_write(), and it fails,
> returns an error.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/iio/frequency/ad9523.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c
> index f3f94fbdd20a..3f9be69499ec 100644
> --- a/drivers/iio/frequency/ad9523.c
> +++ b/drivers/iio/frequency/ad9523.c
> @@ -943,11 +943,14 @@ static int ad9523_setup(struct iio_dev *indio_dev)
>  		}
>  	}
>  
> -	for_each_clear_bit(i, &active_mask, AD9523_NUM_CHAN)
> -		ad9523_write(indio_dev,
> +	for_each_clear_bit(i, &active_mask, AD9523_NUM_CHAN) {
> +		ret = ad9523_write(indio_dev,
>  			     AD9523_CHANNEL_CLOCK_DIST(i),
>  			     AD9523_CLK_DIST_DRIVER_MODE(TRISTATE) |
>  			     AD9523_CLK_DIST_PWR_DOWN_EN);
> +		if (ret < 0)
> +			return ret;
> +	}
>  
>  	ret = ad9523_write(indio_dev, AD9523_POWER_DOWN_CTRL, 0);
>  	if (ret < 0)