drm/amd/display: fix issues with driver unload

[ Upstream commit e433adc60f7f847e734c56246b09291532f29b6d ]

Currently, we run into a number of WARN()s when attempting to unload the
amdgpu driver (e.g. using "modprobe -r amdgpu"). These all stem from
calling drm_encoder_cleanup() too early. So, to fix this we can stop
calling drm_encoder_cleanup() from amdgpu_dm_fini() and instead have it
be called from amdgpu_dm_encoder_destroy(). Also, we don't need to free
in amdgpu_dm_encoder_destroy() since mst_encoders[] isn't explicitly
allocated by the slab allocator.

Fixes: f74367e492ba ("drm/amdgpu/display: create fake mst encoders ahead of time (v4)")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 409739ee5ba0a2c647e8b73e26a499bfd03fa78d..a2d9e0af0654445175a8b174e80f71e1eb633bfb 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1688,10 +1688,6 @@ static void amdgpu_dm_fini(struct amdgpu_device *adev)
        }
 #endif
 
-       for (i = 0; i < adev->dm.display_indexes_num; i++) {
-               drm_encoder_cleanup(&adev->dm.mst_encoders[i].base);
-       }
-
        amdgpu_dm_destroy_drm_device(&adev->dm);
 
 #if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 652cf108b3c2a7b28d33b3f7d1291b1a5ddd7646..bc02e3e0d17d0322439774cb0b19b9097de1bc40 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -385,7 +385,6 @@ static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs
 static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
 {
        drm_encoder_cleanup(encoder);
-       kfree(encoder);
 }
 
 static const struct drm_encoder_funcs amdgpu_dm_encoder_funcs = {