[PATCH 6/8] mtip32xx: quiesce request queues to make sure no submissions are inflight

[Sagi Grimberg]

Unlike blk_mq_stop_hw_queues, blk_mq_quiesce_queue respects the
submission path rcu grace. quiesce the queue before iterating
on live tags, or performing device io quiescing.

Signed-off-by: Sagi Grimberg <s...@grimberg.me>
---
 drivers/block/mtip32xx/mtip32xx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c 
b/drivers/block/mtip32xx/mtip32xx.c
index 61b046f256ca..69a62aeace2a 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -950,7 +950,7 @@ static int mtip_quiesce_io(struct mtip_port *port, unsigned 
long timeout)
        unsigned long to;
        bool active = true;
 
-       blk_mq_stop_hw_queues(port->dd->queue);
+       blk_mq_quiesce_queue(port->dd->queue);
 
        to = jiffies + msecs_to_jiffies(timeout);
        do {
@@ -970,10 +970,10 @@ static int mtip_quiesce_io(struct mtip_port *port, 
unsigned long timeout)
                        break;
        } while (time_before(jiffies, to));
 
-       blk_mq_start_stopped_hw_queues(port->dd->queue, true);
+       blk_mq_unquiesce_queue(port->dd->queue);
        return active ? -EBUSY : 0;
 err_fault:
-       blk_mq_start_stopped_hw_queues(port->dd->queue, true);
+       blk_mq_unquiesce_queue(port->dd->queue);
        return -EFAULT;
 }
 
@@ -3995,7 +3995,7 @@ static int mtip_block_remove(struct driver_data *dd)
                                                dd->disk->disk_name);
 
        blk_freeze_queue_start(dd->queue);
-       blk_mq_stop_hw_queues(dd->queue);
+       blk_mq_quiesce_queue(dd->queue);
        blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);
 
        /*
-- 
2.7.4