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

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

drm/dp/mst: fix in MSTB RAD initialization

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-mstb-rad-initialization.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 <[email protected]> know about it.

From: Mykola Lysenko <[email protected]>
Date: Fri, 25 Dec 2015 16:14:47 +0800
Subject: drm/dp/mst: fix in MSTB RAD initialization

From: Mykola Lysenko <[email protected]>

commit 75af4c8c4c0f60d7ad135419805798f144e9baf9 upstream.

This fix is needed to support more then two
branch displays, so RAD address consist at
least of 2 elements

---
 drivers/gpu/drm/drm_dp_mst_topology.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

@@ -973,17 +973,17 @@ static struct drm_dp_mst_port *drm_dp_ge
 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
 				 u8 *rad)
 {
-	int lct = port->parent->lct;
+	int parent_lct = port->parent->lct;
 	int shift = 4;
-	int idx = lct / 2;
-	if (lct > 1) {
-		memcpy(rad, port->parent->rad, idx);
-		shift = (lct % 2) ? 4 : 0;
+	int idx = (parent_lct - 1) / 2;
+	if (parent_lct > 1) {
+		memcpy(rad, port->parent->rad, idx + 1);
+		shift = (parent_lct % 2) ? 4 : 0;
 	} else
 		rad[0] = 0;
 
 	rad[idx] |= port->port_num << shift;
-	return lct + 1;
+	return parent_lct + 1;
 }
 
 /*

Patches currently in stable-queue which might be from [email protected] 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