gpu: nvgpu: Schedule channel update when jobs actually finish

Do not schedule channel update call backs unless a job is actually
finished. This saves a lot of call backs to the CDE code that don't
do anything when semaphores are enabled.

Bug 1732449
JIRA DNVGPU-12

Change-Id: I2f9a78498b08ebca44ee6a5171931a07721767f1
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1133786
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 6ef8a6cf..5b259672 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -1865,6 +1865,7 @@ static void gk20a_channel_clean_up_jobs(struct work_struct *work)
         struct channel_gk20a_job *job;
         struct gk20a_platform *platform;
         struct gk20a *g;
+        int job_finished = 0;
 
         c = gk20a_channel_get(c);
         if (!c)
@@ -1934,11 +1935,11 @@ static void gk20a_channel_clean_up_jobs(struct work_struct *work)
                 mutex_unlock(&c->jobs_lock);
 
                 kfree(job);
-
+                job_finished = 1;
                 gk20a_idle(g->dev);
         }
 
-        if (c->update_fn)
+        if (job_finished && c->update_fn)
                 schedule_work(&c->update_fn_work);
 
         gk20a_channel_put(c);