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bnx2x: Prevent restarting Tx during bnx2x_nic_unload 

Tx queues were stopped before  bp->state was changed to a value different 
from BNX2X_STATE_OPEN, which allowed the bnx2x_tx_int() called from the 
NAPI context to re-enable it. This then allowed the netdev->ndo_start_xmit() 
to be called in the middle of the function reset and rings freeing. 

This patch changes bp->state to a value different 
from BNX2X_STATE_OPEN BEFORE disabling the Tx queues in order to restore the
broken protection against the above race in the bnx2x_tx_int().

Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladislav Zolotarov 2011-08-02 01:35:43 -07:00 committed by David S. Miller
parent 22019b1782
commit 87b7ba3d24
1 changed files with 8 additions and 2 deletions
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10
drivers/net/bnx2x/bnx2x_cmn.c
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@ -1989,14 +1989,20 @@ int bnx2x_nic_unload(struct bnx2x *bp, int unload_mode)
return -EINVAL;
}
/*
* It's important to set the bp->state to the value different from
* BNX2X_STATE_OPEN and only then stop the Tx. Otherwise bnx2x_tx_int()
* may restart the Tx from the NAPI context (see bnx2x_tx_int()).
*/
bp->state = BNX2X_STATE_CLOSING_WAIT4_HALT;
smp_mb();
/* Stop Tx */
bnx2x_tx_disable(bp);
#ifdef BCM_CNIC
bnx2x_cnic_notify(bp, CNIC_CTL_STOP_CMD);
#endif
bp->state = BNX2X_STATE_CLOSING_WAIT4_HALT;
smp_mb();
bp->rx_mode = BNX2X_RX_MODE_NONE;