On 2021-04-15 1:55 p.m., Shashank Sharma wrote:
This patch checks the return value of the function
dc_link_add_remote_sink before using it. This was causing
a crash during consecutive hotplugs of DP MST displays.
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
Reviewed-by: Harry Wentland <harry.wentland@xxxxxxx>
Harry
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 5 +++++
1 file changed, 5 insertions(+)
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 eee19edeeee5..8dc5005bec0a 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
@@ -226,6 +226,11 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
(aconnector->edid->extensions + 1) * EDID_LENGTH,
&init_params);
+ if (!dc_sink) {
+ DRM_ERROR("Unable to add a remote sink\n");
+ return 0;
+ }
+
dc_sink->priv = aconnector;
/* dc_link_add_remote_sink returns a new reference */
aconnector->dc_sink = dc_sink;
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