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drm/display/dp_mst: Fix drm_dp_mst_add_affected_dsc_crtcs() return code

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[ Upstream commit 2f3a1273862cb82cca227630cc7f04ce0c94b6bb ]

Looks like that we're accidentally dropping a pretty important return code
here. For some reason, we just return -EINVAL if we fail to get the MST
topology state. This is wrong: error codes are important and should never
be squashed without being handled, which here seems to have the potential
to cause a deadlock.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Wayne Lin <Wayne.Lin@amd.com>
Fixes: 8ec046716c ("drm/dp_mst: Add helper to trigger modeset on affected DSC MST CRTCs")
Cc: <stable@vger.kernel.org> # v5.6+
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lyude Paul 2022-11-14 17:17:53 -05:00 committed by Greg Kroah-Hartman
parent 1faf21bdd1
commit 44b204730b
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_dp_mst_topology.c
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@ -5238,7 +5238,7 @@ int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm
mst_state = drm_atomic_get_mst_topology_state(state, mgr);
if (IS_ERR(mst_state))
return -EINVAL;
return PTR_ERR(mst_state);
list_for_each_entry(pos, &mst_state->vcpis, next) {