Commit f53cb3b6 authored by Imre Deak's avatar Imre Deak Committed by sanglipeng
Browse files

drm/display/dp_mst: Fix down message handling after a packet reception error 

stable inclusion
from stable-v5.10.173
commit d90967f850b1f2ff600d2dcc4261487ffd23e523
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7X0QU

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d90967f850b1f2ff600d2dcc4261487ffd23e523



--------------------------------

commit 1241aedb upstream.

After an error during receiving a packet for a multi-packet DP MST
sideband message, the state tracking which packets have been received
already is not reset. This prevents the reception of subsequent down
messages (due to the pending message not yet completed with an
end-of-message-transfer packet).

Fix the above by resetting the reception state after a packet error.

Cc: Lyude Paul <lyude@redhat.com>
Cc: <stable@vger.kernel.org> # v3.17+
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarLyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221214184258.2869417-2-imre.deak@intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarsanglipeng <sanglipeng1@jd.com>
parent 3934456c

drivers/gpu/drm/drm_dp_mst_topology.c

+1 −1
Original line number Diff line number Diff line
@@ -3988,7 +3988,7 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) 
	struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv;



	if (!drm_dp_get_one_sb_msg(mgr, false, &mstb))

		goto out;

		goto out_clear_reply;



	/* Multi-packet message transmission, don't clear the reply */

	if (!msg->have_eomt)