-----Original Message----- From: Nicolai Stange [mailto:nicstange@gmail.com] Sent: Monday, December 05, 2016 3:30 PM To: Daniel Vetter Cc: Deucher, Alexander; Koenig, Christian; Michel Dänzer; linux- kernel@vger.kernel.org; dri-devel@lists.freedesktop.org; Nicolai Stange Subject: [PATCH] drm/amdgpu: don't add files at control minor debugfs directory
Since commit 8a357d10043c ("drm: Nerf DRM_CONTROL nodes"), a struct drm_device's ->control member is always NULL.
In the case of CONFIG_DEBUG_FS=y, amdgpu_debugfs_add_files() accesses ->control->debugfs_root though. This results in a NULL pointer dereference.
Fix this by omitting the drm_debugfs_create_files() call for the control minor debugfs directory which is now non-existent anyway.
Fixes: 8a357d10043c ("drm: Nerf DRM_CONTROL nodes") Signed-off-by: Nicolai Stange nicstange@gmail.com
Please add the bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98915 With that, Reviewed-by: Alex Deucher alexander.deucher@amd.com
Applicable to next-20161202. Compile-only tested.
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 ------ 1 file changed, 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index deee2db..0cb3e82 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -2493,9 +2493,6 @@ int amdgpu_debugfs_add_files(struct amdgpu_device *adev, adev->debugfs_count = i; #if defined(CONFIG_DEBUG_FS) drm_debugfs_create_files(files, nfiles,
adev->ddev->control->debugfs_root,adev->ddev->control);- drm_debugfs_create_files(files, nfiles, adev->ddev->primary->debugfs_root, adev->ddev->primary);
#endif @@ -2510,9 +2507,6 @@ static void amdgpu_debugfs_remove_files(struct amdgpu_device *adev) for (i = 0; i < adev->debugfs_count; i++) { drm_debugfs_remove_files(adev->debugfs[i].files, adev->debugfs[i].num_files,
adev->ddev->control);drm_debugfs_remove_files(adev->debugfs[i].files,adev->debugfs[i].num_files, adev->ddev->primary);#endif
2.10.2