On Wed 31 Mar 02:21 CDT 2021, Vinod Koul wrote: > We get warning for 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 instead. > > 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> > --- > 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..55ed133c6704 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; > + s8 devnum = 0; At least in today's linux-next qcom_swrm_get_alert_slave_dev_num() returns an int and the code only checks to see if this is negative. So it seems like making this a full int ensures there's no truncation etc. And at least as written today there's no need to initialize the variable. Regards, Bjorn > int ret = IRQ_HANDLED; > > swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts); > -- > 2.26.3 >
