Patch "drm/dp/mst: fix in RAD element access" has been added to the 4.4-stable tree

Patch "drm/dp/mst: fix in RAD element access" has been added to the 4.4-stable tree

[gregkh]

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

    drm/dp/mst: fix in RAD element access

to the 4.4-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-dp-mst-fix-in-rad-element-access.patch
and it can be found in the queue-4.4 subdirectory.

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


>From 7a11a334aa6af4c65c6a0d81b60c97fc18673532 Mon Sep 17 00:00:00 2001
From: Mykola Lysenko <Mykola.Lysenko@amd.com>
Date: Fri, 25 Dec 2015 16:14:48 +0800
Subject: drm/dp/mst: fix in RAD element access

From: Mykola Lysenko <Mykola.Lysenko@amd.com>

commit 7a11a334aa6af4c65c6a0d81b60c97fc18673532 upstream.

This is needed to receive correct port
number from RAD, so MSTB could be found

Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/drm_dp_mst_topology.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -1039,7 +1039,7 @@ static void build_mst_prop_path(const st
 	snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
 	for (i = 0; i < (mstb->lct - 1); i++) {
 		int shift = (i % 2) ? 0 : 4;
-		int port_num = mstb->rad[i / 2] >> shift;
+		int port_num = (mstb->rad[i / 2] >> shift) & 0xf;
 		snprintf(temp, sizeof(temp), "-%d", port_num);
 		strlcat(proppath, temp, proppath_size);
 	}
@@ -1190,7 +1190,7 @@ static struct drm_dp_mst_branch *drm_dp_
 
 	for (i = 0; i < lct - 1; i++) {
 		int shift = (i % 2) ? 0 : 4;
-		int port_num = rad[i / 2] >> shift;
+		int port_num = (rad[i / 2] >> shift) & 0xf;
 
 		list_for_each_entry(port, &mstb->ports, next) {
 			if (port->port_num == port_num) {


Patches currently in stable-queue which might be from Mykola.Lysenko@amd.com are

queue-4.4/drm-dp-mst-deallocate-payload-on-port-destruction.patch
queue-4.4/drm-dp-mst-process-broadcast-messages-correctly.patch
queue-4.4/drm-dp-mst-fix-in-rad-element-access.patch
queue-4.4/drm-dp-mst-always-send-reply-for-up-request.patch
queue-4.4/drm-dp-mst-fix-in-mstb-rad-initialization.patch