ixgbe: LINKS2 is not a valid register for 82598

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index f42a954ef660..79533e2720f9 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;
+                        }
+                }
         }
 
         /*