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drm/amdgpu/dm: Fix NULL pointer crash during DP MST hotplug 

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@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Shashank Sharma 2021-04-15 23:18:12 +05:30 committed by Alex Deucher
parent fe18017839
commit ea9bc8b928
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
View File

@ -229,6 +229,11 @@ 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;