mtip32xx: stop block hardware queues before quiescing IO

We need to stop the block layer queues to prevent new "normal"
IO from entering the driver, while we wait for existing commands
to finish.
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/block/mtip32xx/mtip32xx.c

@@ -1031,6 +1031,8 @@ static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 	unsigned int n;
 	unsigned int active = 1;
 
+	blk_mq_stop_hw_queues(port->dd->queue);
+
 	to = jiffies + msecs_to_jiffies(timeout);
 	do {
 		if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
@@ -1039,7 +1041,7 @@ static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 			continue; /* svc thd is actively issuing commands */
 		}
 		if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
-			return -EFAULT;
+			goto err_fault;
 		/*
 		 * Ignore s_active bit 0 of array element 0.
 		 * This bit will always be set
@@ -1054,7 +1056,11 @@ static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 		msleep(20);
 	} while (time_before(jiffies, to));
 
+	blk_mq_start_stopped_hw_queues(port->dd->queue, true);
 	return active ? -EBUSY : 0;
+err_fault:
+	blk_mq_start_stopped_hw_queues(port->dd->queue, true);
+	return -EFAULT;
 }
 
 /*