igb: initialize mailbox function pointers prior to phy init

The igb driver is currently initializing the mailbox function pointers
after the phy.  This causes issues as the phy init will return from the
function early if there is no phy present.

To resolve this I have moved the function pointer init to a location prior
to the phy initialization so that serdes based adapters can also make use
of SR-IOV.
Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/igb/e1000_82575.c

@@ -172,6 +172,10 @@ static s32 igb_get_invariants_82575(struct e1000_hw *hw)
 		size = 14;
 	nvm->word_size = 1 << size;
 
+	/* if 82576 then initialize mailbox parameters */
+	if (mac->type == e1000_82576)
+		igb_init_mbx_params_pf(hw);
+
 	/* setup PHY parameters */
 	if (phy->media_type != e1000_media_type_copper) {
 		phy->type = e1000_phy_none;
@@ -221,10 +225,6 @@ static s32 igb_get_invariants_82575(struct e1000_hw *hw)
 		return -E1000_ERR_PHY;
 	}
 
-	/* if 82576 then initialize mailbox parameters */
-	if (mac->type == e1000_82576)
-		igb_init_mbx_params_pf(hw);
-
 	return 0;
 }