gpu: nvgpu: add lock for fences

All pre/post fence accesses in last_submit are
currently protected by submit lock
In order to remove the submit lock, move all fence
accesses under own lock i.e. fence_lock

Bug 200187553

Change-Id: I0132d1933dc92db8c5ed8c9311e49a030aa2d38c
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1120409
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
index d8951b94..74c920e4 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
@@ -152,9 +152,9 @@ struct channel_gk20a {
 
         bool cmds_pending;
         struct {
-                /* These fences should be accessed with submit_lock held. */
                 struct gk20a_fence *pre_fence;
                 struct gk20a_fence *post_fence;
+                struct mutex fence_lock;
         } last_submit;
 
         void (*remove_support)(struct channel_gk20a *);