From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Thu, 6 Apr 2017 01:02:50 +0000 (+1000)
Subject: ftgmac100: Add missing barrier in ftgmac100_rx_packet()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=027f426d547967cd1b6899597367aa64af51c28e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

ftgmac100: Add missing barrier in ftgmac100_rx_packet()

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 5cd854e740a9..535e8a00d404 100644
--- 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)))