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authorSteve Glendinning <steve.glendinning@smsc.com>2009-03-18 23:37:18 -0700
committerDavid S. Miller <davem@davemloft.net>2009-03-18 23:37:18 -0700
commit44c1d6f99d4c86638bffabf0b7a232d0fe7ae574 (patch)
tree6904225f0189f7d5229dd529f64de71c97c55e7b
parent2e2a6a9f710255c87cef670fb71fc9e74bef1da2 (diff)
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smsc911x: reset last known duplex and carrier on open
smsc911x_phy_adjust_link is called periodically by the phy layer (as it's run in polling mode), and it only updates the hardware when it sees a change in duplex or carrier. This patch clears the last known values every time the interface is brought up, instead of only when the module is loaded. Without this patch the adjust_link function never updates the hardware after an ifconfig down; ifconfig up. On a full duplex link this causes the tx error counter to increment, even though packets are correctly transmitted, as the default MAC_CR register setting is for half duplex. The tx errors are "no carrier" errors, which should be ignored in full-duplex mode. When MAC_CR is set to "full duplex" mode they are correctly ignored by the hardware. Note that even with this patch the tx error counter can increment if packets are transmitted between "ifconfig up" and the first phy poll interval. An improved solution would use the phy interrupt with phylib, but I haven't managed to make this work 100% robustly yet. Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/smsc911x.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index 9a78daec2fe..d1590ac55e4 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -1225,6 +1225,10 @@ static int smsc911x_open(struct net_device *dev)
dev_info(&dev->dev, "SMSC911x/921x identified at %#08lx, IRQ: %d\n",
(unsigned long)pdata->ioaddr, dev->irq);
+ /* Reset the last known duplex and carrier */
+ pdata->last_duplex = -1;
+ pdata->last_carrier = -1;
+
/* Bring the PHY up */
phy_start(pdata->phy_dev);