From: Wayne Lin Date: Tue, 21 May 2024 03:54:26 +0000 (+0800) Subject: drm/amd/display: Don't refer to dc_sink in is_dsc_need_re_compute X-Git-Tag: v6.10.5~159 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=39b217193729aa45eded8de24d9245468a0c0263;p=thirdparty%2Fkernel%2Fstable.git drm/amd/display: Don't refer to dc_sink in is_dsc_need_re_compute [ Upstream commit fcf6a49d79923a234844b8efe830a61f3f0584e4 ] [Why] When unplug one of monitors connected after mst hub, encounter null pointer dereference. It's due to dc_sink get released immediately in early_unregister() or detect_ctx(). When commit new state which directly referring to info stored in dc_sink will cause null pointer dereference. [how] Remove redundant checking condition. Relevant condition should already be covered by checking if dsc_aux is null or not. Also reset dsc_aux to NULL when the connector is disconnected. Reviewed-by: Jerry Zuo Acked-by: Zaeem Mohamed Signed-off-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- 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 e90f9d6975111..7c405ffae1a3d 100644 --- 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 @@ -182,6 +182,8 @@ amdgpu_dm_mst_connector_early_unregister(struct drm_connector *connector) dc_sink_release(dc_sink); aconnector->dc_sink = NULL; aconnector->edid = NULL; + aconnector->dsc_aux = NULL; + port->passthrough_aux = NULL; } aconnector->mst_status = MST_STATUS_DEFAULT; @@ -494,6 +496,8 @@ dm_dp_mst_detect(struct drm_connector *connector, dc_sink_release(aconnector->dc_sink); aconnector->dc_sink = NULL; aconnector->edid = NULL; + aconnector->dsc_aux = NULL; + port->passthrough_aux = NULL; amdgpu_dm_set_mst_status(&aconnector->mst_status, MST_REMOTE_EDID | MST_ALLOCATE_NEW_PAYLOAD | MST_CLEAR_ALLOCATED_PAYLOAD, @@ -1233,14 +1237,6 @@ static bool is_dsc_need_re_compute( if (!aconnector || !aconnector->dsc_aux) continue; - /* - * check if cached virtual MST DSC caps are available and DSC is supported - * as per specifications in their Virtual DPCD registers. - */ - if (!(aconnector->dc_sink->dsc_caps.dsc_dec_caps.is_dsc_supported || - aconnector->dc_link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT)) - continue; - stream_on_link[new_stream_on_link_num] = aconnector; new_stream_on_link_num++;