linux-kernel - Re: [PATCH 2/7] Staging: iio: adt7316: Add an extra check for 'ret' equals to 0

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Date:   Sat, 17 Nov 2018 17:00:23 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Shreeya Patel <shreeya.patel23498@...il.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] Staging: iio: adt7316: Add an extra check for 'ret'
 equals to 0

On Sat, 17 Nov 2018 04:21:32 +0530
Shreeya Patel <shreeya.patel23498@...il.com> wrote:

> ret = 0 indicates a case of no error but no data read from
> the bus which is an invalid case. This case doesn't ever happen
> in reality. It should perhaps be handled for correctness though.
> 
> Signed-off-by: Shreeya Patel <shreeya.patel23498@...il.com>
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/addac/adt7316-i2c.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c
> index 856bcfa60c6c..473e5e34ec00 100644
> --- a/drivers/staging/iio/addac/adt7316-i2c.c
> +++ b/drivers/staging/iio/addac/adt7316-i2c.c
> @@ -30,6 +30,10 @@ static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
>  	}
>  
>  	ret = i2c_smbus_read_byte(client);
> +
> +	if (!ret)
> +		return -EIO;
> +
>  	if (ret < 0) {
>  		dev_err(&cl->dev, "I2C read error\n");
>  		return ret;