linux-kernel - Re: [PATCH][next] soundwire: qcom: Fix a u8 comparison with less than zero

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Date:   Wed, 31 Mar 2021 13:32:16 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Andy Gross <agross@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] soundwire: qcom: Fix a u8 comparison with less
 than zero

On Wed 31 Mar 09:09 CDT 2021, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>
> 
> Variable devnum is being checked for a less than zero error return
> however the comparison will always be false because devnum is an 8 bit
> unsigned integer. Fix this by making devnum an int.  Also there is no
> need to iniitialize devnum with zero as this value is no read, so
> remove the redundant assignment.
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: c7d49c76d1d5 ("soundwire: qcom: add support to new interrupts")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.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..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);
> -- 
> 2.30.2
>