Re: [linux-next:master 6935/11192] drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c:538:25-29: ERROR: aconnector is NULL but dereferenced. (fwd)

[Hamza Mahfooz <hamza.mahfooz@xxxxxxx>]

On 10/10/23 15:24, Julia Lawall wrote:
> See line 538.
>
> julia
>
> ---------- Forwarded message ----------
> Date: Wed, 11 Oct 2023 01:30:34 +0800
> From: kernel test robot <lkp@xxxxxxxxx>
> To: oe-kbuild@xxxxxxxxxxxxxxx
> Cc: lkp@xxxxxxxxx, Julia Lawall <julia.lawall@xxxxxxxx>
> Subject: [linux-next:master 6935/11192]
>      drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c:538:25-29: ERROR:
>      aconnector is NULL but dereferenced.
>
> BCC: lkp@xxxxxxxxx
> CC: oe-kbuild-all@xxxxxxxxxxxxxxx
> CC: Linux Memory Management List <linux-mm@xxxxxxxxx>
> TO: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
> CC: Alex Deucher <alexander.deucher@xxxxxxx>
> CC: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   c0a6edb636cba9c0d1db966a54d910a02e52e4be
> commit: 5d72e247e58c966f4e50cffebf0d414de7fc90ed [6935/11192] drm/amd/display: switch DC over to the new DRM logging macros
> :::::: branch date: 12 hours ago
> :::::: commit date: 2 weeks ago
> config: x86_64-randconfig-104-20231010 (https://download.01.org/0day-ci/archive/20231011/202310110104.H593hwLd-lkp@xxxxxxxxx/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce: (https://download.01.org/0day-ci/archive/20231011/202310110104.H593hwLd-lkp@xxxxxxxxx/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Reported-by: Julia Lawall <julia.lawall@xxxxxxxx>
> | Closes: https://lore.kernel.org/r/202310110104.H593hwLd-lkp@xxxxxxxxx/
>
> cocci warnings: (new ones prefixed by >>)
> > > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c:538:25-29: ERROR: aconnector is NULL but dereferenced.
>
> vim +538 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
>
> 4562236b3bc0a28 Harry Wentland 2017-09-12  534
> c84dec2fe8837fa Harry Wentland 2017-09-05  535  	struct amdgpu_dm_connector *aconnector = link->priv;
> 4562236b3bc0a28 Harry Wentland 2017-09-12  536
> 4562236b3bc0a28 Harry Wentland 2017-09-12  537  	if (!aconnector) {
> 5d72e247e58c966 Hamza Mahfooz  2023-09-20 @538  		drm_dbg_dp(aconnector->base.dev,
> 5d72e247e58c966 Hamza Mahfooz  2023-09-20  539  			   "Failed to find connector for link!\n");

Can you send out a patch that drops drm_dbg_dp() from here? Since, it
should only be reachable before hw init and it is expected at that
point, so it doesn't provide any meaningful insights.

> 4562236b3bc0a28 Harry Wentland 2017-09-12  540  		return false;
> 4562236b3bc0a28 Harry Wentland 2017-09-12  541  	}
> 4562236b3bc0a28 Harry Wentland 2017-09-12  542
> 4648cf5fc8c78d7 Hamza Mahfooz  2023-03-08  543  	return drm_dp_dpcd_read(&aconnector->dm_dp_aux.aux, address, data,
> 4648cf5fc8c78d7 Hamza Mahfooz  2023-03-08  544  				size) == size;
> 4562236b3bc0a28 Harry Wentland 2017-09-12  545  }
> 4562236b3bc0a28 Harry Wentland 2017-09-12  546
--
Hamza