From 1241aedb6b5c7a5a8ad73e5eb3a41cfe18a3e00e Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@intel.com>
Date: Wed, 14 Dec 2022 20:42:57 +0200
Subject: [PATCH] drm/display/dp_mst: Fix down message handling after a packet reception error
Git-commit: 1241aedb6b5c7a5a8ad73e5eb3a41cfe18a3e00e
Patch-mainline: v6.3-rc1
References: git-fixes

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: Imre Deak <imre.deak@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221214184258.2869417-2-imre.deak@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 90819fff2c9b..01350510244f 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -3856,7 +3856,7 @@ 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)
-- 
2.35.3