gpu: nvgpu: return from worker if gpu is not up

During GPU shutdown path, it is possible that we
shut down the GPU while worker thread is still
running gk20a_channel_update()

Hence before accessing gp_put/get, check if GPU
is up or not

Bug 200166139

Change-Id: Iba3ec173041a84527c4700a93f20564a842cfb01
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/935193
(cherry picked from commit c81ea5fe383c44e872754b363968af57d84225ac)
Reviewed-on: http://git-master/r/1121917
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index a7f8005b..d94e12a2 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -1871,6 +1871,11 @@ static void gk20a_channel_clean_up_jobs(struct work_struct *work)
         if (!c)
                 return;
 
+        if (!c->g->power_on) { /* shutdown case */
+                gk20a_channel_put(c);
+                return;
+        }
+
         vm = c->vm;
         g = c->g;
         platform = gk20a_get_platform(g->dev);
@@ -1951,6 +1956,11 @@ void gk20a_channel_update(struct channel_gk20a *c, int nr_completed)
         if (!c)
                 return;
 
+        if (!c->g->power_on) { /* shutdown case */
+                gk20a_channel_put(c);
+                return;
+        }
+
         update_gp_get(c->g, c);
         wake_up(&c->submit_wq);