gpu: nvgpu: Protect sync by an own lock

Protect creation and deletion of sync by an own mutex. This prevents
deadlock in channel abort when abort is called from submit path.

Bug 200147887

Change-Id: I5d6308b773c1d1a6a89d4590e2e74c74d691f79d
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/821127

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
index 3e18e053..794d8228 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
@@ -166,6 +166,7 @@ struct channel_gk20a {
         struct nvgpu_notification *error_notifier;
         void *error_notifier_va;
 
+        struct mutex sync_lock;
         struct gk20a_channel_sync *sync;
 
 #ifdef CONFIG_TEGRA_GR_VIRTUALIZATION