linux-kernel - drivers/gpu/drm/msm/dp/dp_display.c:1045:21: warning: variable 'drm' set but not used

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Date:   Wed, 7 Jul 2021 15:16:21 +0800
From:   kernel test robot <lkp@...el.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Rob Clark <robdclark@...omium.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>
Subject: drivers/gpu/drm/msm/dp/dp_display.c:1045:21: warning: variable 'drm'
 set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   77d34a4683b053108ecd466cc7c4193b45805528
commit: eb9d6c7ebe44df4bf077e71de809bb7b216da38c drm/msm: pass dump state as a function argument
date:   2 weeks ago
config: arm64-buildonly-randconfig-r005-20210707 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb9d6c7ebe44df4bf077e71de809bb7b216da38c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout eb9d6c7ebe44df4bf077e71de809bb7b216da38c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/msm/dp/dp_display.c: In function 'dp_display_usbpd_attention_cb':
   drivers/gpu/drm/msm/dp/dp_display.c:506:19: warning: variable 'hpd' set but not used [-Wunused-but-set-variable]
     506 |  struct dp_usbpd *hpd;
         |                   ^~~
   drivers/gpu/drm/msm/dp/dp_display.c: In function 'msm_dp_snapshot':
>> drivers/gpu/drm/msm/dp/dp_display.c:1045:21: warning: variable 'drm' set but not used [-Wunused-but-set-variable]
    1045 |  struct drm_device *drm;
         |                     ^~~


vim +/drm +1045 drivers/gpu/drm/msm/dp/dp_display.c

c943b4948b5848 Chandan Uddaraju 2020-08-27  1041  
eb9d6c7ebe44df Dmitry Baryshkov 2021-04-27  1042  void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
0f6090f37f8018 Abhinav Kumar    2021-04-16  1043  {
0f6090f37f8018 Abhinav Kumar    2021-04-16  1044  	struct dp_display_private *dp_display;
0f6090f37f8018 Abhinav Kumar    2021-04-16 @1045  	struct drm_device *drm;
0f6090f37f8018 Abhinav Kumar    2021-04-16  1046  
0f6090f37f8018 Abhinav Kumar    2021-04-16  1047  	dp_display = container_of(dp, struct dp_display_private, dp_display);
0f6090f37f8018 Abhinav Kumar    2021-04-16  1048  	drm = dp->drm_dev;
0f6090f37f8018 Abhinav Kumar    2021-04-16  1049  
0f6090f37f8018 Abhinav Kumar    2021-04-16  1050  	/*
0f6090f37f8018 Abhinav Kumar    2021-04-16  1051  	 * if we are reading registers we need the link clocks to be on
0f6090f37f8018 Abhinav Kumar    2021-04-16  1052  	 * however till DP cable is connected this will not happen as we
0f6090f37f8018 Abhinav Kumar    2021-04-16  1053  	 * do not know the resolution to power up with. Hence check the
0f6090f37f8018 Abhinav Kumar    2021-04-16  1054  	 * power_on status before dumping DP registers to avoid crash due
0f6090f37f8018 Abhinav Kumar    2021-04-16  1055  	 * to unclocked access
0f6090f37f8018 Abhinav Kumar    2021-04-16  1056  	 */
0f6090f37f8018 Abhinav Kumar    2021-04-16  1057  	mutex_lock(&dp_display->event_mutex);
0f6090f37f8018 Abhinav Kumar    2021-04-16  1058  
0f6090f37f8018 Abhinav Kumar    2021-04-16  1059  	if (!dp->power_on) {
0f6090f37f8018 Abhinav Kumar    2021-04-16  1060  		mutex_unlock(&dp_display->event_mutex);
0f6090f37f8018 Abhinav Kumar    2021-04-16  1061  		return;
0f6090f37f8018 Abhinav Kumar    2021-04-16  1062  	}
0f6090f37f8018 Abhinav Kumar    2021-04-16  1063  
0f6090f37f8018 Abhinav Kumar    2021-04-16  1064  	dp_catalog_snapshot(dp_display->catalog, disp_state);
0f6090f37f8018 Abhinav Kumar    2021-04-16  1065  
0f6090f37f8018 Abhinav Kumar    2021-04-16  1066  	mutex_unlock(&dp_display->event_mutex);
0f6090f37f8018 Abhinav Kumar    2021-04-16  1067  }
0f6090f37f8018 Abhinav Kumar    2021-04-16  1068  

:::::: The code at line 1045 was first introduced by commit
:::::: 0f6090f37f801871b292c296ed34eb2b089a0477 drm/msm/dp: add API to take DP register snapshot

:::::: TO: Abhinav Kumar <abhinavk@...eaurora.org>
:::::: CC: Rob Clark <robdclark@...omium.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (42139 bytes)