From 5b346dc97567270a5c0f02a390a1d1bb65237cea Mon Sep 17 00:00:00 2001 From: Mark Rustad Date: Tue, 4 Mar 2014 03:02:18 +0000 Subject: [PATCH] ixgbevf: Protect ixgbevf_down with __IXGBEVF_DOWN bit The ixgbevf_down function can now prevent multiple executions by doing test_and_set_bit on __IXGBEVF_DOWN. This did not work before introduction of the __IXGBEVF_REMOVING bit, because of overloading of __IXGBEVF_DOWN. Also add smp_mb__before_clear_bit call before clearing the __IXGBEVF_DOWN bit. Signed-off-by: Mark Rustad Tested-by: Phil Schmitt Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c index 940d9244df62..a2cba53c31be 100644 --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c @@ -1620,6 +1620,7 @@ static void ixgbevf_up_complete(struct ixgbevf_adapter *adapter) spin_unlock_bh(&adapter->mbx_lock); + smp_mb__before_clear_bit(); clear_bit(__IXGBEVF_DOWN, &adapter->state); ixgbevf_napi_enable_all(adapter); @@ -1744,7 +1745,8 @@ void ixgbevf_down(struct ixgbevf_adapter *adapter) int i; /* signal that we are down to the interrupt handler */ - set_bit(__IXGBEVF_DOWN, &adapter->state); + if (test_and_set_bit(__IXGBEVF_DOWN, &adapter->state)) + return; /* do nothing if already down */ /* disable all enabled rx queues */ for (i = 0; i < adapter->num_rx_queues; i++) -- 2.20.1