linux-kernel - [PATCH] soundwire: qcom: use signed variable for error return

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Date:   Wed, 31 Mar 2021 12:51:11 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: [PATCH] soundwire: qcom: use signed variable for error return

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@...el.com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 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;
 	int ret = IRQ_HANDLED;
 
 	swrm->reg_read(swrm, SWRM_INTERRUPT_STATUS, &intr_sts);
-- 
2.26.3