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drm/display/dp_mst: Fix payload addition on a disconnected sink 

commit 33f960e23c upstream.

If an MST stream is enabled on a disconnected sink, the payload for the
stream is not created and the MST manager's payload count/next start VC
slot is not updated. Since the payload's start VC slot may still contain
a valid value (!= -1) the subsequent disabling of such a stream could
cause an incorrect decrease of the payload count/next start VC slot in
drm_dp_remove_payload() and hence later payload additions will fail.

Fix the above by marking the payload as invalid in the above case, so
that it's skipped during payload removal. While at it add a debug print
for this case.

Cc: Lyude Paul <lyude@redhat.com>
Cc: <stable@vger.kernel.org> # v6.1+
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221214184258.2869417-3-imre.deak@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Imre Deak 2022-12-14 20:42:58 +02:00 committed by Greg Kroah-Hartman
parent efe5ce019a
commit 6e48e7901e
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/display/drm_dp_mst_topology.c
View File

@ -3309,8 +3309,13 @@ int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
int ret;
port = drm_dp_mst_topology_get_port_validated(mgr, payload->port);
if (!port)
if (!port) {
drm_dbg_kms(mgr->dev,
"VCPI %d for port %p not in topology, not creating a payload\n",
payload->vcpi, payload->port);
payload->vc_start_slot = -1;
return 0;
}
if (mgr->payload_count == 0)
mgr->next_start_slot = mst_state->start_slot;