linux-kernel - [117/118] r8169: fix vlan tag read ordering.

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Message-ID: <lsq.1368193181.15393931@decadent.org.uk>
Date:	Fri, 10 May 2013 14:39:41 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Hayes Wang" <hayeswang@...ltek.com>,
	"David S. Miller" <davem@...emloft.net>,
	"françois romieu" <romieu@...zoreil.com>
Subject: [117/118] r8169: fix vlan tag read ordering.

3.2.45-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: françois romieu <romieu@...zoreil.com>

commit ce11ff5e5963e441feb591e76278528f876c332d upstream.

Control of receive descriptor must not be returned to ethernet chipset
before vlan tag processing is done.

VLAN tag receive word is now reset both in normal and error path.

Signed-off-by: Francois Romieu <romieu@...zoreil.com>
Spotted-by: Timo Teras <timo.teras@....fi>
Cc: Hayes Wang <hayeswang@...ltek.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/realtek/r8169.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -1629,8 +1629,6 @@ static void rtl8169_rx_vlan_tag(struct R
 
 	if (opts2 & RxVlanTag)
 		__vlan_hwaccel_put_tag(skb, swab16(opts2 & 0xffff));
-
-	desc->opts2 = 0;
 }
 
 static int rtl8169_gset_tbi(struct net_device *dev, struct ethtool_cmd *cmd)
@@ -5823,7 +5821,6 @@ static int rtl8169_rx_interrupt(struct n
 				rtl8169_schedule_work(dev, rtl8169_reset_task);
 				dev->stats.rx_fifo_errors++;
 			}
-			rtl8169_mark_to_asic(desc, rx_buf_sz);
 		} else {
 			struct sk_buff *skb;
 			dma_addr_t addr = le64_to_cpu(desc->addr);
@@ -5837,16 +5834,14 @@ static int rtl8169_rx_interrupt(struct n
 			if (unlikely(rtl8169_fragmented_frame(status))) {
 				dev->stats.rx_dropped++;
 				dev->stats.rx_length_errors++;
-				rtl8169_mark_to_asic(desc, rx_buf_sz);
-				continue;
+				goto release_descriptor;
 			}
 
 			skb = rtl8169_try_rx_copy(tp->Rx_databuff[entry],
 						  tp, pkt_size, addr);
-			rtl8169_mark_to_asic(desc, rx_buf_sz);
 			if (!skb) {
 				dev->stats.rx_dropped++;
-				continue;
+				goto release_descriptor;
 			}
 
 			rtl8169_rx_csum(skb, status);
@@ -5860,6 +5855,10 @@ static int rtl8169_rx_interrupt(struct n
 			dev->stats.rx_bytes += pkt_size;
 			dev->stats.rx_packets++;
 		}
+release_descriptor:
+		desc->opts2 = 0;
+		wmb();
+		rtl8169_mark_to_asic(desc, rx_buf_sz);
 	}
 
 	count = cur_rx - tp->cur_rx;

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