Reviewed-by: Matt Ranostay <mranostay@xxxxxxxxx>
On Mon, May 30, 2016 at 7:52 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> gcc warns about a potentially uninitialized variable use
> in as3935_event_work:
>
> drivers/iio/proximity/as3935.c: In function ‘as3935_event_work’:
> drivers/iio/proximity/as3935.c:231:6: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> This case specifically happens when spi_w8r8() fails with a
> negative return code. We check all other users of this function
> except this one.
>
> As the error is rather unlikely to happen after the device
> has already been initialized, this just adds a dev_warn().
> Another warning already existst in the same function, but is
> missing a trailing '\n' character, so I'm fixing that too.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/iio/proximity/as3935.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/proximity/as3935.c b/drivers/iio/proximity/as3935.c
> index f4d29d5dbd5f..b49e3ab5730a 100644
> --- a/drivers/iio/proximity/as3935.c
> +++ b/drivers/iio/proximity/as3935.c
> @@ -224,10 +224,16 @@ static void as3935_event_work(struct work_struct *work)
> {
> struct as3935_state *st;
> int val;
> + int ret;
>
> st = container_of(work, struct as3935_state, work.work);
>
> - as3935_read(st, AS3935_INT, &val);
> + ret = as3935_read(st, AS3935_INT, &val);
> + if (ret) {
> + dev_warn(&st->spi->dev, "read error\n");
> + return;
> + }
> +
> val &= AS3935_INT_MASK;
>
> switch (val) {
> @@ -235,7 +241,7 @@ static void as3935_event_work(struct work_struct *work)
> iio_trigger_poll(st->trig);
> break;
> case AS3935_NOISE_INT:
> - dev_warn(&st->spi->dev, "noise level is too high");
> + dev_warn(&st->spi->dev, "noise level is too high\n");
> break;
> }
> }
> --
> 2.7.0
>
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