From: Vladislav Zolotarov Date: Tue, 2 Aug 2011 08:35:43 +0000 (-0700) Subject: bnx2x: Prevent restarting Tx during bnx2x_nic_unload X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=87b7ba3d24a25cf18aece447de27d7804fa9668c;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 Signed-off-by: Eilon Greenstein Signed-off-by: David S. Miller --- diff --git a/drivers/net/bnx2x/bnx2x_cmn.c b/drivers/net/bnx2x/bnx2x_cmn.c index 5b0dba6d4efa..d724a18b5285 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;