ixgbe: add error checks when initializing the PHY

Ignoring errors when attempting to identify the PHY can lead to a crash.
Specifically in the case of FW controlled PHYs where the PHY read/write
operations are set to NULL.

Removed redundant comment.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index 933c507..8cea53b 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -3192,6 +3192,9 @@ static s32 ixgbe_init_phy_ops_X550em(struct ixgbe_hw *hw)
 
        /* Identify the PHY or SFP module */
        ret_val = phy->ops.identify(hw);
+       if (ret_val == IXGBE_ERR_SFP_NOT_SUPPORTED ||
+           ret_val == IXGBE_ERR_PHY_ADDR_INVALID)
+               return ret_val;
 
        /* Setup function pointers based on detected hardware */
        ixgbe_init_mac_link_ops_X550em(hw);
@@ -3394,9 +3397,10 @@ static s32 ixgbe_reset_hw_X550em(struct ixgbe_hw *hw)
        ixgbe_clear_tx_pending(hw);
 
        /* PHY ops must be identified and initialized prior to reset */
-
-       /* Identify PHY and related function pointers */
        status = hw->phy.ops.init(hw);
+       if (status == IXGBE_ERR_SFP_NOT_SUPPORTED ||
+           status == IXGBE_ERR_PHY_ADDR_INVALID)
+               return status;
 
        /* start the external PHY */
        if (hw->phy.type == ixgbe_phy_x550em_ext_t) {