diff mbox series

[4.9,05/24] drm_dp_mst_topology: fix broken drm_dp_sideband_parse_remote_dpcd_read()

Message ID 20200402191747.789097-5-lee.jones@linaro.org
State New
Headers show
Series [4.9,01/24] clk: qcom: rcg: Return failure for RCG update | expand

Commit Message

Lee Jones April 2, 2020, 7:17 p.m. UTC 
From: Hans Verkuil <hans.verkuil@cisco.com>

[ Upstream commit a4c30a4861c54af78c4eb8b7855524c1a96d9f80 ]

When parsing the reply of a DP_REMOTE_DPCD_READ DPCD command the
result is wrong due to a missing idx increment.

This was never noticed since DP_REMOTE_DPCD_READ is currently not
used, but if you enable it, then it is all wrong.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/e72ddac2-1dc0-100a-d816-9ac98ac009dd@xs4all.nl
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 17aedaaf364c1..93f2033b414a2 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -431,6 +431,7 @@  static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx
 	if (idx > raw->curlen)
 		goto fail_len;
 	repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx];
+	idx++;
 	if (idx > raw->curlen)
 		goto fail_len;