linux-kernel - Re: [PATCH -next] backlight: qcom-wled: fix unsigned comparison to zero

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Message-ID: <20200122003932.GA3948@builder>
Date:   Tue, 21 Jan 2020 16:39:32 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Chen Zhou <chenzhou10@...wei.com>
Cc:     agross@...nel.org, lee.jones@...aro.org,
        daniel.thompson@...aro.org, jingoohan1@...il.com,
        b.zolnierkie@...sung.com, kgunda@...eaurora.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] backlight: qcom-wled: fix unsigned comparison to
 zero

On Mon 20 Jan 05:01 PST 2020, Chen Zhou wrote:

> Fixes coccicheck warning:
> ./drivers/video/backlight/qcom-wled.c:1104:5-15:
> 	WARNING: Unsigned expression compared with zero: string_len > 0
> 
> The unsigned variable string_len is assigned a return value from the call
> to wled_configure, which may return negative error code.
> 

Afaict string_len is the return value of
of_property_count_elems_of_size(), rather than wled_configure(). (And
please append () to function names to make it even more obvious)

Except for that your patch looks good, so please update the commit
message and add my Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Fixes: 775d2ffb4af6 ("backlight: qcom-wled: Restructure the driver for WLED3")
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> ---
>  drivers/video/backlight/qcom-wled.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index d46052d..3d276b3 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -956,8 +956,8 @@ static int wled_configure(struct wled *wled, int version)
>  	struct wled_config *cfg = &wled->cfg;
>  	struct device *dev = wled->dev;
>  	const __be32 *prop_addr;
> -	u32 size, val, c, string_len;
> -	int rc, i, j;
> +	u32 size, val, c;
> +	int rc, i, j, string_len;
>  
>  	const struct wled_u32_opts *u32_opts = NULL;
>  	const struct wled_u32_opts wled3_opts[] = {
> -- 
> 2.7.4
>