Patch "drm/i915: Avoid stalling on pending flips for legacy cursor updates" has been added to the 4.5-stable tree

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

drm/i915: Avoid stalling on pending flips for legacy cursor updates

to the 4.5-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-i915-avoid-stalling-on-pending-flips-for-legacy-cursor-updates.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Chris Wilson <[email protected]>
Date: Sun, 17 Apr 2016 20:42:46 +0100
Subject: drm/i915: Avoid stalling on pending flips for legacy cursor updates
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From: Chris Wilson <[email protected]>

commit 7ac7d19f808697abe6658c64c96868f728273f9c upstream.

The legacy cursor ioctl expects to be asynchronous with respect to other screen updates, in particular page flips. As X updates the cursor from a signal context, if the cursor blocks then it will stall both the input and output chains causing bad stuttering and horrible UX.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94980

---
 drivers/gpu/drm/i915/intel_display.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -13429,6 +13429,9 @@ static int intel_atomic_prepare_commit(s
 	}
 
 	for_each_crtc_in_state(state, crtc, crtc_state, i) {
+		if (state->legacy_cursor_update)
+			continue;
+
 		ret = intel_crtc_wait_for_pending_flips(crtc);
 		if (ret)
 			return ret;

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

queue-4.5/drm-i915-avoid-stalling-on-pending-flips-for-legacy-cursor-updates.patch