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| author | Vladislav Zolotarov <vladz@broadcom.com> | 2011-08-02 01:35:43 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-08-02 01:35:43 -0700 |
| commit | 87b7ba3d24a25cf18aece447de27d7804fa9668c (patch) | |
| tree | 3d47489b40ee858ddc093069a8723c2d9a63fcf8 | |
| parent | 22019b17821ab3543090827491e465c5816cbcd6 (diff) | |
| download | linux-3.10-87b7ba3d24a25cf18aece447de27d7804fa9668c.tar.gz linux-3.10-87b7ba3d24a25cf18aece447de27d7804fa9668c.tar.bz2 linux-3.10-87b7ba3d24a25cf18aece447de27d7804fa9668c.zip | |
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>
| -rw-r--r-- | drivers/net/bnx2x/bnx2x_cmn.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/net/bnx2x/bnx2x_cmn.c b/drivers/net/bnx2x/bnx2x_cmn.c index 5b0dba6d4ef..d724a18b528 100644 --- a/drivers/net/bnx2x/bnx2x_cmn.c +++ b/drivers/net/bnx2x/bnx2x_cmn.c @@ -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; |