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ixgbe: ixgbe_down needs to stop dev_watchdog

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There is a small race between when the tx queues are stopped
and when netif_carrier_off() is called in ixgbe_down.  If the
dev_watchdog() timer fires during this time it is possible for
a false tx timeout to occur.

This patch moves the netif_carrier_off() so that it is called before
the tx queues are stopped preventing the dev_watchdog timer from
detecting false tx timeouts.  The race is seen occosionally when
FCoE or DCB settings are being configured or changed.

Testing note, running ifconfig up/down will not reproduce this
issue because dev_open/dev_close call dev_deactivate() and then
dev_activate().

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2010-04-27 02:13:39 +00:00 committed by David S. Miller
parent ff846f5293
commit c0dfb90e5b
1 changed files with 7 additions and 8 deletions
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15
drivers/net/ixgbe/ixgbe_main.c
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@ -3291,22 +3291,23 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
rxctrl = IXGBE_READ_REG(hw, IXGBE_RXCTRL);
IXGBE_WRITE_REG(hw, IXGBE_RXCTRL, rxctrl & ~IXGBE_RXCTRL_RXEN);
netif_tx_disable(netdev);
IXGBE_WRITE_FLUSH(hw);
msleep(10);
netif_tx_stop_all_queues(netdev);
ixgbe_irq_disable(adapter);
ixgbe_napi_disable_all(adapter);
clear_bit(__IXGBE_SFP_MODULE_NOT_FOUND, &adapter->state);
del_timer_sync(&adapter->sfp_timer);
del_timer_sync(&adapter->watchdog_timer);
cancel_work_sync(&adapter->watchdog_task);
netif_carrier_off(netdev);
netif_tx_disable(netdev);
ixgbe_irq_disable(adapter);
ixgbe_napi_disable_all(adapter);
if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE ||
adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)
cancel_work_sync(&adapter->fdir_reinit_task);
@ -3324,8 +3325,6 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
(IXGBE_READ_REG(hw, IXGBE_DMATXCTL) &
~IXGBE_DMATXCTL_TE));
netif_carrier_off(netdev);
/* clear n-tuple filters that are cached */
ethtool_ntuple_flush(netdev);