On Tue, Jul 04, 2017 at 10:55:08AM +0300, Sagi Grimberg wrote: > unlike blk_mq_stop_hw_queues and blk_mq_start_stopped_hw_queues > quiescing/unquiescing respects the submission path rcu grace. > > Signed-off-by: Sagi Grimberg <[email protected]> > --- > drivers/nvme/host/pci.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c > index eb729ff70e7d..df7c8a355075 100644 > --- a/drivers/nvme/host/pci.c > +++ b/drivers/nvme/host/pci.c > @@ -1125,7 +1125,7 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq) > spin_unlock_irq(&nvmeq->q_lock); > > if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) > - blk_mq_stop_hw_queues(nvmeq->dev->ctrl.admin_q); > + blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q); > > pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq); > > @@ -1315,7 +1315,7 @@ static void nvme_dev_remove_admin(struct nvme_dev *dev) > * user requests may be waiting on a stopped queue. Start the > * queue to flush these to completion. > */ > - blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); > + blk_mq_unquiesce_queue(dev->ctrl.admin_q); > blk_cleanup_queue(dev->ctrl.admin_q); > blk_mq_free_tag_set(&dev->admin_tagset); > } > @@ -1351,8 +1351,10 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) > dev->ctrl.admin_q = NULL; > return -ENODEV; > } > - } else > - blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); > + } else { > + blk_mq_unquiesce_queue(dev->ctrl.admin_q); > + blk_mq_kick_requeue_list(dev->ctrl.admin_q);
Again, blk_mq_kick_requeue_list() may not be required. -- Ming
