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Subject[linux-stable-rc:linux-5.10.y 6780/7990] drivers/gpu/drm/msm/dp/dp_display.c:523:26: warning: variable 'hpd' set but not used
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y
head: 71f2154ac93f2d6cf536292c7c72b410e05c8041
commit: acf76125bb2b247d27cb4ca57fda772c8a691fe9 [6780/7990] drm/msm/dp: fix connect/disconnect handled at irq_hpd
config: arm64-buildonly-randconfig-r006-20220815 (https://download.01.org/0day-ci/archive/20220816/202208160913.aFS2WTCD-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
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/stable/linux-stable-rc.git/commit/?id=acf76125bb2b247d27cb4ca57fda772c8a691fe9
git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
git fetch --no-tags linux-stable-rc linux-5.10.y
git checkout acf76125bb2b247d27cb4ca57fda772c8a691fe9
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/msm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.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:523:26: warning: variable 'hpd' set but not used [-Wunused-but-set-variable]
523 | struct dp_usbpd *hpd;
| ^~~


vim +/hpd +523 drivers/gpu/drm/msm/dp/dp_display.c

c943b4948b5848 Chandan Uddaraju 2020-08-27 517
c943b4948b5848 Chandan Uddaraju 2020-08-27 518 static int dp_display_usbpd_attention_cb(struct device *dev)
c943b4948b5848 Chandan Uddaraju 2020-08-27 519 {
c943b4948b5848 Chandan Uddaraju 2020-08-27 520 int rc = 0;
61f8f4034c0423 Kuogee Hsieh 2020-11-03 521 u32 sink_request;
c943b4948b5848 Chandan Uddaraju 2020-08-27 522 struct dp_display_private *dp;
61f8f4034c0423 Kuogee Hsieh 2020-11-03 @523 struct dp_usbpd *hpd;
c943b4948b5848 Chandan Uddaraju 2020-08-27 524
c943b4948b5848 Chandan Uddaraju 2020-08-27 525 if (!dev) {
c943b4948b5848 Chandan Uddaraju 2020-08-27 526 DRM_ERROR("invalid dev\n");
c943b4948b5848 Chandan Uddaraju 2020-08-27 527 return -EINVAL;
c943b4948b5848 Chandan Uddaraju 2020-08-27 528 }
c943b4948b5848 Chandan Uddaraju 2020-08-27 529
061eb621fc2780 Abhinav Kumar 2020-09-12 530 dp = container_of(g_dp_display,
061eb621fc2780 Abhinav Kumar 2020-09-12 531 struct dp_display_private, dp_display);
c943b4948b5848 Chandan Uddaraju 2020-08-27 532 if (!dp) {
c943b4948b5848 Chandan Uddaraju 2020-08-27 533 DRM_ERROR("no driver data found\n");
c943b4948b5848 Chandan Uddaraju 2020-08-27 534 return -ENODEV;
c943b4948b5848 Chandan Uddaraju 2020-08-27 535 }
c943b4948b5848 Chandan Uddaraju 2020-08-27 536
61f8f4034c0423 Kuogee Hsieh 2020-11-03 537 hpd = dp->usbpd;
61f8f4034c0423 Kuogee Hsieh 2020-11-03 538
c943b4948b5848 Chandan Uddaraju 2020-08-27 539 /* check for any test request issued by sink */
8ede2ecc3e5ee3 Kuogee Hsieh 2020-09-11 540 rc = dp_link_process_request(dp->link);
61f8f4034c0423 Kuogee Hsieh 2020-11-03 541 if (!rc) {
61f8f4034c0423 Kuogee Hsieh 2020-11-03 542 sink_request = dp->link->sink_request;
acf76125bb2b24 Kuogee Hsieh 2020-11-18 543 if (sink_request & DS_PORT_STATUS_CHANGED)
acf76125bb2b24 Kuogee Hsieh 2020-11-18 544 rc = dp_display_handle_port_ststus_changed(dp);
acf76125bb2b24 Kuogee Hsieh 2020-11-18 545 else
61f8f4034c0423 Kuogee Hsieh 2020-11-03 546 rc = dp_display_handle_irq_hpd(dp);
61f8f4034c0423 Kuogee Hsieh 2020-11-03 547 }
c943b4948b5848 Chandan Uddaraju 2020-08-27 548
8ede2ecc3e5ee3 Kuogee Hsieh 2020-09-11 549 return rc;
c943b4948b5848 Chandan Uddaraju 2020-08-27 550 }
c943b4948b5848 Chandan Uddaraju 2020-08-27 551

:::::: The code at line 523 was first introduced by commit
:::::: 61f8f4034c04231148e7580ae51a2a74171c04a0 drm/msm/dp: promote irq_hpd handle to handle link training correctly

:::::: TO: Kuogee Hsieh <khsieh@codeaurora.org>
:::::: CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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