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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id o19sm736501pjr.2.2020.01.21.16.39.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jan 2020 16:39:35 -0800 (PST) Date: Tue, 21 Jan 2020 16:39:32 -0800 From: Bjorn Andersson To: Chen Zhou Cc: agross@kernel.org, lee.jones@linaro.org, daniel.thompson@linaro.org, jingoohan1@gmail.com, b.zolnierkie@samsung.com, kgunda@codeaurora.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH -next] backlight: qcom-wled: fix unsigned comparison to zero Message-ID: <20200122003932.GA3948@builder> References: <20200120130143.35363-1-chenzhou10@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200120130143.35363-1-chenzhou10@huawei.com> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Regards, Bjorn > Fixes: 775d2ffb4af6 ("backlight: qcom-wled: Restructure the driver for WLED3") > Signed-off-by: Chen Zhou > --- > 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 >