From: Hans Verkuil Date: Mon, 27 Aug 2018 08:07:42 +0000 (+0200) Subject: drm_dp_mst_topology: fix broken drm_dp_sideband_parse_remote_dpcd_read() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=a4c30a4861c54af78c4eb8b7855524c1a96d9f80;p=openwrt%2Fstaging%2Fblogic.git drm_dp_mst_topology: fix broken drm_dp_sideband_parse_remote_dpcd_read() 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 Reviewed-by: Lyude Paul Acked-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/e72ddac2-1dc0-100a-d816-9ac98ac009dd@xs4all.nl --- diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 7780567aa669..5ff1d79b86c4 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -439,6 +439,7 @@ 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;