1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 7481e747..6c4b949a 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -3341,7 +3341,17 @@ void gk20a_channel_semaphore_wakeup(struct gk20a *g, bool post_events)
                                             NVGPU_IOCTL_CHANNEL_EVENT_ID_BLOCKING_SYNC);
                                 }
                         }
-                        gk20a_channel_update(c, 0);
+                        /*
+                         * Only non-deterministic channels get the
+                         * channel_update callback. We don't allow
+                         * semaphore-backed syncs for these channels anyways,
+                         * since they have a dependency on the sync framework.
+                         * If deterministic channels are receiving a semaphore
+                         * wakeup, it must be for a user-space managed
+                         * semaphore.
+                         */
+                        if (!c->deterministic)
+                                gk20a_channel_update(c, 0);
                         gk20a_channel_put(c);
                 }
         }