Patch "drm/display/dp_mst: Fix down/up message handling after sink disconnect" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/display/dp_mst: Fix down/up message handling after sink disconnect

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-display-dp_mst-fix-down-up-message-handling-after-sink-disconnect.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 1d082618bbf3b6755b8cc68c0a8122af2842d593 Mon Sep 17 00:00:00 2001
From: Imre Deak <imre.deak@xxxxxxxxx>
Date: Wed, 14 Dec 2022 20:42:56 +0200
Subject: drm/display/dp_mst: Fix down/up message handling after sink disconnect

From: Imre Deak <imre.deak@xxxxxxxxx>

commit 1d082618bbf3b6755b8cc68c0a8122af2842d593 upstream.

If the sink gets disconnected during receiving a multi-packet DP MST AUX
down-reply/up-request sideband message, the state keeping track of which
packets have been received already is not reset. This results in a failed
sanity check for the subsequent message packet received after a sink is
reconnected (due to the pending message not yet completed with an
end-of-message-transfer packet), indicated by the

"sideband msg set header failed"

error.

Fix the above by resetting the up/down message reception state after a
disconnect event.

Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.17+
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20221214184258.2869417-1-imre.deak@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_dp_mst_topology.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3781,6 +3781,9 @@ int drm_dp_mst_topology_mgr_set_mst(stru
 		set_bit(0, &mgr->payload_mask);
 		mgr->vcpi_mask = 0;
 		mgr->payload_id_table_cleared = false;
+
+		memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv));
+		memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv));
 	}
 
 out_unlock:


Patches currently in stable-queue which might be from imre.deak@xxxxxxxxx are

queue-5.15/drm-display-dp_mst-fix-down-message-handling-after-a-packet-reception-error.patch
queue-5.15/drm-display-dp_mst-fix-down-up-message-handling-after-sink-disconnect.patch



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