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Date:   Mon, 7 May 2018 11:06:38 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     kbuild@01.org, Kiran Gunda <kgunda@codeaurora.org>
Cc:     kbuild-all@01.org, bjorn.andersson@linaro.org,
        Lee Jones <lee.jones@linaro.org>,
        Daniel Thompson <daniel.thompson@linaro.org>,
        Jingoo Han <jingoohan1@gmail.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-leds@vger.kernel.org, Kiran Gunda <kgunda@codeaurora.org>
Subject: Re: [PATCH V1 3/5] backlight: qcom-wled: Add support for short
 circuit handling
Message-ID: <20180507080638.enmel5keygu5ag3h@mwanda>
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In-Reply-To: <1525341432-15818-4-git-send-email-kgunda@codeaurora.org>
User-Agent: NeoMutt/20170609 (1.8.3)
Sender: linux-kernel-owner@vger.kernel.org
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Hi Kiran,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on backlight/for-backlight-next]
[also build test WARNING on v4.17-rc3 next-20180504]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Kiran-Gunda/backlight-qcom-wled-Support-for-QCOM-wled-driver/20180504-011042
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight.git for-backlight-next

smatch warnings:
drivers/video/backlight/qcom-wled.c:304 wled_update_status() warn: inconsistent returns 'mutex:&wled->lock'.
  Locked on:   line 287
  Unlocked on: line 304

# https://github.com/0day-ci/linux/commit/3856199804123df89ef9a712f0740978ec71ddf6
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 3856199804123df89ef9a712f0740978ec71ddf6
vim +304 drivers/video/backlight/qcom-wled.c

18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  263  
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  264  static int wled_update_status(struct backlight_device *bl)
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  265  {
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  266  	struct wled *wled = bl_get_data(bl);
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  267  	u16 brightness = bl->props.brightness;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  268  	int rc = 0;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  269  
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  270  	if (bl->props.power != FB_BLANK_UNBLANK ||
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  271  	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  272  	    bl->props.state & BL_CORE_FBBLANK)
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  273  		brightness = 0;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  274  
38561998 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  275  	mutex_lock(&wled->lock);
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  276  	if (brightness) {
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  277  		rc = wled->wled_set_brightness(wled, brightness);
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  278  		if (rc < 0) {
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  279  			dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  280  				rc);
38561998 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  281  			goto unlock_mutex;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  282  		}
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  283  
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  284  		rc = wled->wled_sync_toggle(wled);
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  285  		if (rc < 0) {
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  286  			dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
93c64f1e drivers/leds/leds-pm8941-wled.c     Courtney Cavin 2015-03-12  287  			return rc;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  288  		}
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  289  	}
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  290  
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  291  	if (!!brightness != !!wled->brightness) {
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  292  		rc = wled_module_enable(wled, !!brightness);
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  293  		if (rc < 0) {
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  294  			dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
38561998 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  295  			goto unlock_mutex;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  296  		}
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  297  	}
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  298  
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  299  	wled->brightness = brightness;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  300  
38561998 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  301  unlock_mutex:
38561998 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  302  	mutex_unlock(&wled->lock);
38561998 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  303  
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03 @304  	return rc;
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  305  }
18e7abb8 drivers/video/backlight/qcom-wled.c Kiran Gunda    2018-05-03  306  

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