gpu: nvgpu: add __must_check to gk20a_busy

The return value of gk20a_busy must be checked since it may not succeed
in some cases. Add the __must_check attribute that generates a compiler
warning for code that does not read the return value and fix all uses of
the function to take error cases into account.

Bug 200040921

Change-Id: Ibc2b119985fa230324c88026fe94fc5f1894fe4f
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/542552
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/as_gk20a.c b/drivers/gpu/nvgpu/gk20a/as_gk20a.c
index ed7602f0..5ca7c806 100644
--- a/drivers/gpu/nvgpu/gk20a/as_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/as_gk20a.c
@@ -82,8 +82,12 @@ int gk20a_as_release_share(struct gk20a_as_share *as_share)
         if (atomic_dec_return(&as_share->ref_cnt) > 0)
                 return 0;
 
-        gk20a_busy(g->dev);
+        err = gk20a_busy(g->dev);
+        if (err)
+                return err;
+
         err = gk20a_vm_release_share(as_share);
+
         gk20a_idle(g->dev);
 
         release_as_share_id(as_share->as, as_share->id);