[patch 22/49] r8169: fix RxMissed register access

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

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

From: Francois Romieu <romieu@xxxxxxxxxxxxx>

Upstream as 523a609496dbc3897e530db2a2f27650d125ea00

- the register is defined for the 8169 chipset only and there is
  no 8169 beyond RTL_GIGA_MAC_VER_06.
- only the lower 3 bytes of the register are valid

Fixes:
1. http://bugzilla.kernel.org/show_bug.cgi?id=10180
2. http://bugzilla.kernel.org/show_bug.cgi?id=11062 (bits of)

Tested by Hermann Gausterer and Adam Huffman.

Signed-off-by: Francois Romieu <romieu@xxxxxxxxxxxxx>
Cc: Edward Hsu <edward_hsu@xxxxxxxxxxxxxx>
Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/r8169.c |   25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -2092,8 +2092,6 @@ static void rtl_hw_start_8168(struct net
 
 	RTL_R8(IntrMask);
 
-	RTL_W32(RxMissed, 0);
-
 	rtl_set_rx_mode(dev);
 
 	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);
@@ -2136,8 +2134,6 @@ static void rtl_hw_start_8101(struct net
 
 	RTL_R8(IntrMask);
 
-	RTL_W32(RxMissed, 0);
-
 	rtl_set_rx_mode(dev);
 
 	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);
@@ -2915,6 +2911,17 @@ static int rtl8169_poll(struct napi_stru
 	return work_done;
 }
 
+static void rtl8169_rx_missed(struct net_device *dev, void __iomem *ioaddr)
+{
+	struct rtl8169_private *tp = netdev_priv(dev);
+
+	if (tp->mac_version > RTL_GIGA_MAC_VER_06)
+		return;
+
+	dev->stats.rx_missed_errors += (RTL_R32(RxMissed) & 0xffffff);
+	RTL_W32(RxMissed, 0);
+}
+
 static void rtl8169_down(struct net_device *dev)
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
@@ -2932,9 +2939,7 @@ core_down:
 
 	rtl8169_asic_down(ioaddr);
 
-	/* Update the error counts. */
-	dev->stats.rx_missed_errors += RTL_R32(RxMissed);
-	RTL_W32(RxMissed, 0);
+	rtl8169_rx_missed(dev, ioaddr);
 
 	spin_unlock_irq(&tp->lock);
 
@@ -3056,8 +3061,7 @@ static struct net_device_stats *rtl8169_
 
 	if (netif_running(dev)) {
 		spin_lock_irqsave(&tp->lock, flags);
-		dev->stats.rx_missed_errors += RTL_R32(RxMissed);
-		RTL_W32(RxMissed, 0);
+		rtl8169_rx_missed(dev, ioaddr);
 		spin_unlock_irqrestore(&tp->lock, flags);
 	}
 
@@ -3082,8 +3086,7 @@ static int rtl8169_suspend(struct pci_de
 
 	rtl8169_asic_down(ioaddr);
 
-	dev->stats.rx_missed_errors += RTL_R32(RxMissed);
-	RTL_W32(RxMissed, 0);
+	rtl8169_rx_missed(dev, ioaddr);
 
 	spin_unlock_irq(&tp->lock);
 

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