Re: [PATCH V2] soundwire: qcom: use signed variable for error return

[Bjorn Andersson]

On Wed 31 Mar 10:55 CDT 2021, Vinod Koul wrote:

> We get warning of using a unsigned variable being compared to less than
> zero. The comparison is correct as it checks for errors from previous
> call to qcom_swrm_get_alert_slave_dev_num(), so we should use a signed
> variable here.
> 
> While at it, drop the superfluous initialization as well
> 
> drivers/soundwire/qcom.c: qcom_swrm_irq_handler() warn: impossible
> condition '(devnum < 0) => (0-255 < 0)'
> 
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>

Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>

> ---
>  drivers/soundwire/qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index b08ecb9b418c..ec86c4e53fdb 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -428,7 +428,7 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id)
>  	struct qcom_swrm_ctrl *swrm = dev_id;
>  	u32 value, intr_sts, intr_sts_masked, slave_status;
>  	u32 i;
> -	u8 devnum = 0;
> +	int devnum;
>  	int ret = IRQ_HANDLED;
>  
>  	swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts);
> -- 
> 2.26.3
>