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Commit d08935c2 authored by Don Skidmore's avatar Don Skidmore Committed by David S. Miller
Browse files

ixgbe: fix for race with 8259(8|9) during shutdown 



There is a small window where the watchdog could be running as the
interface is brought down on a NIC with two ports wired back to back.
If ixgbe_update_status is then called can lead to a panic.  This patch
allows the update to bail if we are in that condition.

This issue was orignally reported and fix proposed by Akihiko Saitou.

CC: Akihiko Saitou <asaitou@users.sourceforge.net>
Signed-off-by: default avatarDon Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e8d15e64

drivers/net/ixgbe/ixgbe_main.c

+4 −0
Original line number Diff line number Diff line
@@ -5282,6 +5282,10 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter) 
	u32 i, missed_rx = 0, mpc, bprc, lxon, lxoff, xon_off_tot;

	u64 non_eop_descs = 0, restart_queue = 0;



	if (test_bit(__IXGBE_DOWN, &adapter->state) ||

	    test_bit(__IXGBE_RESETTING, &adapter->state))

		return;



	if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {

		u64 rsc_count = 0;

		u64 rsc_flush = 0;