ixgbe: fix panic due to uninitialised pointer

Systems containing an 82599EB and running a backported driver from
upstream were panicing on boot.  It turns out hw->mac.ops.setup_sfp is
only set for 82599, so one should check to be sure that pointer is set
before continuing in ixgbe_sfp_config_module_task.  I verified by
inspection that the upstream driver has the same issue and also added a
check before the call in ixgbe_sfp_link_config.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index fbae703b46d7327fd470c2f8409f501b4ba51f4b..30f9ccfb4f8700efceb9b1b8eceaadea2bf9f8c7 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -3728,7 +3728,8 @@ static void ixgbe_sfp_link_config(struct ixgbe_adapter *adapter)
                         * We need to try and force an autonegotiation
                         * session, then bring up link.
                         */
-                       hw->mac.ops.setup_sfp(hw);
+                       if (hw->mac.ops.setup_sfp)
+                               hw->mac.ops.setup_sfp(hw);
                        if (!(adapter->flags & IXGBE_FLAG_IN_SFP_LINK_TASK))
                                schedule_work(&adapter->multispeed_fiber_task);
                } else {
@@ -5968,7 +5969,8 @@ static void ixgbe_sfp_config_module_task(struct work_struct *work)
                unregister_netdev(adapter->netdev);
                return;
        }
-       hw->mac.ops.setup_sfp(hw);
+       if (hw->mac.ops.setup_sfp)
+               hw->mac.ops.setup_sfp(hw);
 
        if (!(adapter->flags & IXGBE_FLAG_IN_SFP_LINK_TASK))
                /* This will also work for DA Twinax connections */