From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============7209053156663778608==" MIME-Version: 1.0 From: kernel test robot Subject: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:3552 amdgpu_dm_backlight_update_status() error: testing array offset 'i' after use. Date: Mon, 20 Dec 2021 16:16:55 +0800 Message-ID: <202112201629.HD4tpHHY-lkp@intel.com> List-Id: To: kbuild@lists.01.org --===============7209053156663778608== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable CC: kbuild-all(a)lists.01.org CC: linux-kernel(a)vger.kernel.org TO: Alex Deucher CC: Roman Li tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git = master head: a7904a538933c525096ca2ccde1e60d0ee62c08e commit: 7fd13baeb7a3a48cae12c36c52f06bf4e9e7d728 drm/amdgpu/display: add su= pport for multiple backlights date: 5 months ago :::::: branch date: 10 hours ago :::::: commit date: 5 months ago config: x86_64-randconfig-m001-20211207 (https://download.01.org/0day-ci/ar= chive/20211220/202112201629.HD4tpHHY-lkp(a)intel.com/config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot Reported-by: Dan Carpenter New smatch warnings: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:3552 amdgpu_dm_= backlight_update_status() error: testing array offset 'i' after use. drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:3594 amdgpu_dm_= backlight_get_brightness() error: testing array offset 'i' after use. Old smatch warnings: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:1349 amdgpu_dm_= fini() warn: variable dereferenced before check 'adev->dm.dc' (see line 133= 6) drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:5888 create_str= eam_for_sink() error: we previously assumed 'aconnector->dc_sink' could be = null (see line 5786) drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:8194 handle_cur= sor_update() error: we previously assumed 'afb' could be null (see line 815= 3) vim +/i +3552 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c 4562236b3bc0a2 Harry Wentland 2017-09-12 3542 = 3d6c91641bc8a8 Alex Deucher 2021-05-11 3543 static int amdgpu_dm_backli= ght_update_status(struct backlight_device *bd) 4562236b3bc0a2 Harry Wentland 2017-09-12 3544 { 620a0d27b211aa David Francis 2018-07-19 3545 struct amdgpu_display_mana= ger *dm =3D bl_get_data(bd); 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3546 int i; 3d6c91641bc8a8 Alex Deucher 2021-05-11 3547 = 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3548 for (i =3D 0; i < dm->num_= of_edps; i++) { 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3549 if (bd =3D=3D dm->backlig= ht_dev[i]) 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3550 break; 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3551 } 7fd13baeb7a3a4 Alex Deucher 2021-07-08 @3552 if (i >=3D AMDGPU_DM_MAX_N= UM_EDP) 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3553 i =3D 0; 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3554 amdgpu_dm_backlight_set_le= vel(dm, i, bd->props.brightness); 3d6c91641bc8a8 Alex Deucher 2021-05-11 3555 = 3d6c91641bc8a8 Alex Deucher 2021-05-11 3556 return 0; 3d6c91641bc8a8 Alex Deucher 2021-05-11 3557 } 3d6c91641bc8a8 Alex Deucher 2021-05-11 3558 = 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3559 static u32 amdgpu_dm_backli= ght_get_level(struct amdgpu_display_manager *dm, 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3560 int bl_idx) 3d6c91641bc8a8 Alex Deucher 2021-05-11 3561 { 0ad3e64eb46d8c Alex Deucher 2020-12-10 3562 struct amdgpu_dm_backlight= _caps caps; 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3563 struct dc_link *link =3D (= struct dc_link *)dm->backlight_link[bl_idx]; 0ad3e64eb46d8c Alex Deucher 2020-12-10 3564 = 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3565 amdgpu_dm_update_backlight= _caps(dm, bl_idx); 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3566 caps =3D dm->backlight_cap= s[bl_idx]; 0ad3e64eb46d8c Alex Deucher 2020-12-10 3567 = 0ad3e64eb46d8c Alex Deucher 2020-12-10 3568 if (caps.aux_support) { 0ad3e64eb46d8c Alex Deucher 2020-12-10 3569 u32 avg, peak; 0ad3e64eb46d8c Alex Deucher 2020-12-10 3570 bool rc; 0ad3e64eb46d8c Alex Deucher 2020-12-10 3571 = 0ad3e64eb46d8c Alex Deucher 2020-12-10 3572 rc =3D dc_link_get_backli= ght_level_nits(link, &avg, &peak); 0ad3e64eb46d8c Alex Deucher 2020-12-10 3573 if (!rc) 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3574 return dm->brightness[bl= _idx]; 0ad3e64eb46d8c Alex Deucher 2020-12-10 3575 return convert_brightness= _to_user(&caps, avg); 0ad3e64eb46d8c Alex Deucher 2020-12-10 3576 } else { 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3577 int ret =3D dc_link_get_b= acklight_level(link); 620a0d27b211aa David Francis 2018-07-19 3578 = 620a0d27b211aa David Francis 2018-07-19 3579 if (ret =3D=3D DC_ERROR_U= NEXPECTED) 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3580 return dm->brightness[bl= _idx]; 0ad3e64eb46d8c Alex Deucher 2020-12-10 3581 return convert_brightness= _to_user(&caps, ret); 0ad3e64eb46d8c Alex Deucher 2020-12-10 3582 } 4562236b3bc0a2 Harry Wentland 2017-09-12 3583 } 4562236b3bc0a2 Harry Wentland 2017-09-12 3584 = 3d6c91641bc8a8 Alex Deucher 2021-05-11 3585 static int amdgpu_dm_backli= ght_get_brightness(struct backlight_device *bd) 3d6c91641bc8a8 Alex Deucher 2021-05-11 3586 { 3d6c91641bc8a8 Alex Deucher 2021-05-11 3587 struct amdgpu_display_mana= ger *dm =3D bl_get_data(bd); 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3588 int i; 3d6c91641bc8a8 Alex Deucher 2021-05-11 3589 = 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3590 for (i =3D 0; i < dm->num_= of_edps; i++) { 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3591 if (bd =3D=3D dm->backlig= ht_dev[i]) 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3592 break; 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3593 } 7fd13baeb7a3a4 Alex Deucher 2021-07-08 @3594 if (i >=3D AMDGPU_DM_MAX_N= UM_EDP) 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3595 i =3D 0; 7fd13baeb7a3a4 Alex Deucher 2021-07-08 3596 return amdgpu_dm_backlight= _get_level(dm, i); 3d6c91641bc8a8 Alex Deucher 2021-05-11 3597 } 3d6c91641bc8a8 Alex Deucher 2021-05-11 3598 = --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org --===============7209053156663778608==--