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

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/ltc/base.c
index 39c2a38e54f7..0c7ef250dcaf 100644
--- 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, u32 first, u32 count)
 
         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