gpu: nvgpu: fix a sync_fence leak

Fixes a bug where reference to sync_fence is not closed before return.
Bug 200171146

Change-Id: If174eb124bd69692bab4cc8629a103517d7cfef1
Signed-off-by: Yunbo Wang <yunbow@nvidia.com>
Reviewed-on: http://git-master/r/1029844
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Eric Miao <emiao@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
index 8ff53d17..87f0bf74 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
@@ -115,8 +115,10 @@ static int gk20a_channel_syncpt_wait_fd(struct gk20a_channel_sync *s, int fd,
         }
 
         num_wait_cmds = nvhost_sync_num_pts(sync_fence);
-        if (num_wait_cmds == 0)
+        if (num_wait_cmds == 0) {
+                sync_fence_put(sync_fence);
                 return 0;
+        }
 
         err = gk20a_channel_alloc_priv_cmdbuf(c, 4 * num_wait_cmds, &wait_cmd);
         if (err) {