ixbge: Protect ixgbe_down with __IXGBE_DOWN bit

The ixgbe_down function can now prevent multiple executions by
doing test_and_set_bit on __IXGBE_DOWN. This did not work before
introduction of the __IXGBE_REMOVING bit, because of overloading
of __IXGBE_DOWN. Also add smp_mb__before_clear_bit call before
clearing the __IXGBE_DOWN bit.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index bf7d177..44a2619 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4573,6 +4573,7 @@ static void ixgbe_up_complete(struct ixgbe_adapter *adapter)
        if (hw->mac.ops.enable_tx_laser)
                hw->mac.ops.enable_tx_laser(hw);
 
+       smp_mb__before_clear_bit();
        clear_bit(__IXGBE_DOWN, &adapter->state);
        ixgbe_napi_enable_all(adapter);
 
@@ -4784,7 +4785,8 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
        int i;
 
        /* signal that we are down to the interrupt handler */
-       set_bit(__IXGBE_DOWN, &adapter->state);
+       if (test_and_set_bit(__IXGBE_DOWN, &adapter->state))
+               return; /* do nothing if already down */
 
        /* disable receives */
        rxctrl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);