netdev - [PATCH] e1000e: don't poke PHY registers to retreive link status

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Message-ID: <20071015213059.27110.43589.stgit@localhost.localdomain>
Date:	Mon, 15 Oct 2007 14:30:59 -0700
From:	Auke Kok <auke-jan.h.kok@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, auke-jan.h.kok@...el.com
Subject: [PATCH] e1000e: don't poke PHY registers to retreive link status

Apparently poking the link status registers when autonegotiation
is running on the PHY might botch the PHY link on 80003es2lan
devices. While this is a very rare condition we can completely
avoid it alltogether by just using the MAC link bits to provide
the proper information to ethtool.

Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---

 drivers/net/e1000e/ethtool.c |   31 +++++++++++++++++++++----------
 1 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
index b7a7e2a..983b031 100644
--- a/drivers/net/e1000e/ethtool.c
+++ b/drivers/net/e1000e/ethtool.c
@@ -110,6 +110,7 @@ static int e1000_get_settings(struct net_device *netdev,
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
+	u32 status;
 
 	if (hw->media_type == e1000_media_type_copper) {
 
@@ -147,16 +148,16 @@ static int e1000_get_settings(struct net_device *netdev,
 		ecmd->transceiver = XCVR_EXTERNAL;
 	}
 
-	if (er32(STATUS) & E1000_STATUS_LU) {
-
-		adapter->hw.mac.ops.get_link_up_info(hw, &adapter->link_speed,
-						  &adapter->link_duplex);
-		ecmd->speed = adapter->link_speed;
-
-		/* unfortunately FULL_DUPLEX != DUPLEX_FULL
-		 *	  and HALF_DUPLEX != DUPLEX_HALF */
+	status = er32(STATUS);
+	if (status & E1000_STATUS_LU) {
+		if (status & E1000_STATUS_SPEED_1000)
+			ecmd->speed = 1000;
+		else if (status & E1000_STATUS_SPEED_100)
+			ecmd->speed = 100;
+		else
+			ecmd->speed = 10;
 
-		if (adapter->link_duplex == FULL_DUPLEX)
+		if (status & E1000_STATUS_FD)
 			ecmd->duplex = DUPLEX_FULL;
 		else
 			ecmd->duplex = DUPLEX_HALF;
@@ -170,6 +171,16 @@ static int e1000_get_settings(struct net_device *netdev,
 	return 0;
 }
 
+static u32 e1000_get_link(struct net_device *netdev)
+{
+	struct e1000_adapter *adapter = netdev_priv(netdev);
+	struct e1000_hw *hw = &adapter->hw;
+	u32 status;
+	
+	status = er32(STATUS);
+	return (status & E1000_STATUS_LU);
+}
+
 static int e1000_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx)
 {
 	struct e1000_mac_info *mac = &adapter->hw.mac;
@@ -1751,7 +1762,7 @@ static const struct ethtool_ops e1000_ethtool_ops = {
 	.get_msglevel		= e1000_get_msglevel,
 	.set_msglevel		= e1000_set_msglevel,
 	.nway_reset		= e1000_nway_reset,
-	.get_link		= ethtool_op_get_link,
+	.get_link		= e1000_get_link,
 	.get_eeprom_len		= e1000_get_eeprom_len,
 	.get_eeprom		= e1000_get_eeprom,
 	.set_eeprom		= e1000_set_eeprom,
-
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