Patch "drm/nouveau/ltc: protect clearing of comptags with mutex" has been added to the 4.9-stable tree

Patch "drm/nouveau/ltc: protect clearing of comptags with mutex" has been added to the 4.9-stable tree

[gregkh]

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

    drm/nouveau/ltc: protect clearing of comptags with mutex

to the 4.9-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-nouveau-ltc-protect-clearing-of-comptags-with-mutex.patch
and it can be found in the queue-4.9 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 f4e65efc88b64c1dbca275d42a188edccedb56c6 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Tue, 13 Dec 2016 09:29:55 +1000
Subject: drm/nouveau/ltc: protect clearing of comptags with mutex

From: Ben Skeggs <bskeggs@redhat.com>

commit f4e65efc88b64c1dbca275d42a188edccedb56c6 upstream.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c
@@ -47,8 +47,10 @@ nvkm_ltc_tags_clear(struct nvkm_ltc *ltc
 
 	BUG_ON((first > limit) || (limit >= ltc->num_tags));
 
+	mutex_lock(&ltc->subdev.mutex);
 	ltc->func->cbc_clear(ltc, first, limit);
 	ltc->func->cbc_wait(ltc);
+	mutex_unlock(&ltc->subdev.mutex);
 }
 
 int


Patches currently in stable-queue which might be from bskeggs@redhat.com are

queue-4.9/drm-nouveau-ttm-wait-for-bo-fence-to-signal-before-unmapping-vmas.patch
queue-4.9/drm-nouveau-bios-require-checksum-to-match-for-fast-acpi-shadow-method.patch
queue-4.9/drm-nouveau-gr-fallback-to-legacy-paths-during-firmware-lookup.patch
queue-4.9/drm-nouveau-kms-lvds-panel-strap-moved-again-on-maxwell.patch
queue-4.9/drm-nouveau-ltc-protect-clearing-of-comptags-with-mutex.patch
queue-4.9/drm-nouveau-fifo-gf100-protect-channel-preempt-with-subdev-mutex.patch
queue-4.9/drm-nouveau-i2c-gk110b-gm10x-use-the-correct-implementation.patch