diff mbox

[08/10] ftgmac100: Add missing barrier in ftgmac100_rx_packet()

Message ID 20170406010252.29208-9-benh@kernel.crashing.org
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Benjamin Herrenschmidt April 6, 2017, 1:02 a.m. UTC 
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox

Patch

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 86bda0a..594af30 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -442,6 +442,9 @@  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)))