diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 5b2596726..a7f8005b7 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)) {