bnx2x: don't wait for Tx completion on recovery

When driver has hit a parity event, HW can no longer write to host memory.
As a result, Tx completions cannot be written to the host SB memory, and
waiting for Tx completions eventually timeout.
As driver is willing to delay as much as 1-2 seconds per Tx queue for its
draining and this delay is sequential, the time to recover might greatly
lengthen needlessly in case the recovery is done under multi-connection
traffic.
Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c

@@ -3042,8 +3042,12 @@ int bnx2x_nic_unload(struct bnx2x *bp, int unload_mode, bool keep_link)
 		bnx2x_save_statistics(bp);
 	}
 
-	/* wait till consumers catch up with producers in all queues */
-	bnx2x_drain_tx_queues(bp);
+	/* wait till consumers catch up with producers in all queues.
+	 * If we're recovering, FW can't write to host so no reason
+	 * to wait for the queues to complete all Tx.
+	 */
+	if (unload_mode != UNLOAD_RECOVERY)
+		bnx2x_drain_tx_queues(bp);
 
 	/* if VF indicate to PF this function is going down (PF will delete sp
 	 * elements and clear initializations