[net-next-2.6 PATCH 3/4] ixgbe: LINKS2 is not a valid register for 82598

[Jeff Kirsher <jeffrey.t.kirsher@intel.com>]

From: Don Skidmore <donald.c.skidmore@intel.com>

82598 shouldn't try and access LINKS2 while configuring
link and flow control.  This is an 82599-only register.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/ixgbe/ixgbe_common.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index f42a954..79533e2 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -1755,17 +1755,24 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
 	/*
 	 * On backplane, bail out if
 	 * - backplane autoneg was not completed, or if
-	 * - link partner is not AN enabled
+	 * - we are 82599 and link partner is not AN enabled
 	 */
 	if (hw->phy.media_type == ixgbe_media_type_backplane) {
 		links = IXGBE_READ_REG(hw, IXGBE_LINKS);
-		links2 = IXGBE_READ_REG(hw, IXGBE_LINKS2);
-		if (((links & IXGBE_LINKS_KX_AN_COMP) == 0) ||
-		    ((links2 & IXGBE_LINKS2_AN_SUPPORTED) == 0)) {
+		if ((links & IXGBE_LINKS_KX_AN_COMP) == 0) {
 			hw->fc.fc_was_autonegged = false;
 			hw->fc.current_mode = hw->fc.requested_mode;
 			goto out;
 		}
+
+		if (hw->mac.type == ixgbe_mac_82599EB) {
+			links2 = IXGBE_READ_REG(hw, IXGBE_LINKS2);
+			if ((links2 & IXGBE_LINKS2_AN_SUPPORTED) == 0) {
+				hw->fc.fc_was_autonegged = false;
+				hw->fc.current_mode = hw->fc.requested_mode;
+				goto out;
+			}
+		}
 	}
 
 	/*