ftgmac100: Add missing barrier in ftgmac100_rx_packet()

ozbenh · davem330 · commit 027f426d5479 · 2017-04-06T15:39:45.000-07:00
Signed-off-by: Benjamin Herrenschmidt &lt;benh@kernel.crashing.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -444,6 +444,9 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
 	if (!ftgmac100_rxdes_packet_ready(rxdes))
 		return false;
 
+	/* Order subsequent reads with the test for the ready bit */
+	dma_rmb();
+
 	/* We don't cope with fragmented RX packets */
 	if (unlikely(!ftgmac100_rxdes_first_segment(rxdes) ||
 		     !ftgmac100_rxdes_last_segment(rxdes)))
