On Fri, Mar 22, 2019 at 03:08:39PM +0100, Arnd Bergmann wrote:
> Clang points out a control flow bug, which happens to be harmless:
>
> drivers/iio/adc/stmpe-adc.c:204:13: error: variable 'data' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
>
> The warning is sensible here, so let's just avoid the case by
> adding appropriate error handling.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/iio/adc/stmpe-adc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
> index 37f4b74a5d32..ed3817c5c896 100644
> --- a/drivers/iio/adc/stmpe-adc.c
> +++ b/drivers/iio/adc/stmpe-adc.c
> @@ -205,6 +205,8 @@ static irqreturn_t stmpe_adc_isr(int irq, void *dev_id)
> /* Read value */
> stmpe_block_read(info->stmpe, STMPE_REG_TEMP_DATA, 2,
> (u8 *) &data);
> + } else {
> + return IRQ_NONE;
> }
>
> info->value = (u32) be16_to_cpu(data);
> --
> 2.20.0
>
I sent a similar patch, which is sitting in Jonathan's testing branch:
https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/commit/?id=e15146e4d4349b3f309f5591ea8de8d24071265f
Nathan
