1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 5b259672..a7f8005b 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -2826,6 +2826,12 @@ void gk20a_channel_semaphore_wakeup(struct gk20a *g, bool post_events)
 
         gk20a_dbg_fn("");
 
+        /*
+         * Ensure that all pending writes are actually done  before trying to
+         * read semaphore values from DRAM.
+         */
+        g->ops.mm.fb_flush(g);
+
         for (chid = 0; chid < f->num_channels; chid++) {
                 struct channel_gk20a *c = g->fifo.channel+chid;
                 if (gk20a_channel_get(c)) {