Re: [PATCH] radio: wl1273: add check on core->write() return value

[Baruch Siach]

Hi Gustavi,

On Wed, Jun 21, 2017 at 11:01:22PM -0500, Gustavo A. R. Silva wrote:
> Check return value from call to core->write(), so in case of
> error print error message, jump to goto label fail and eventually
> return.
> 
> Addresses-Coverity-ID: 1226943
> Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
> ---
>  drivers/media/radio/radio-wl1273.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/radio/radio-wl1273.c 
> b/drivers/media/radio/radio-wl1273.c
> index 7240223..17e82a9 100644
> --- a/drivers/media/radio/radio-wl1273.c
> +++ b/drivers/media/radio/radio-wl1273.c
> @@ -610,10 +610,21 @@ static int wl1273_fm_start(struct wl1273_device *radio, 
> int new_mode)
>                       }
>               }
>  
> -             if (radio->rds_on)
> +             if (radio->rds_on) {
>                       r = core->write(core, WL1273_RDS_DATA_ENB, 1);
> -             else
> +                     if (r) {
> +                             dev_err(dev, "%s: RDS_DATA_ENB ON fails\n",
> +                                     __func__);
> +                             goto fail;
> +                     }
> +             } else {
>                       r = core->write(core, WL1273_RDS_DATA_ENB, 0);
> +                     if (r) {
> +                             dev_err(dev, "%s: RDS_DATA_ENB OFF fails\n",
> +                                     __func__);
> +                             goto fail;
> +                     }
> +             }
>       } else {
>               dev_warn(dev, "%s: Illegal mode.\n", __func__);
>       }

An alternative that duplicates less code (untested):

        r = core->write(core, WL1273_RDS_DATA_ENB, !!radio->rds_on);
        if (r) {
                dev_err(dev, "%s: RDS_DATA_ENB %s fails\n",
                        __func__, radio->rds_on ? "ON" : "OFF");
                goto fail;
        }

baruch

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