On Tue, Apr 27, 2021 at 06:16:19PM +0200, Christoph Hellwig wrote: > Set the poll queue flags to enable polling, given that the multipath > node just dispatches the bios to a lower queue. > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > --- > drivers/nvme/host/multipath.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c > index 1d17b2387884..0fa38f648ae7 100644 > --- a/drivers/nvme/host/multipath.c > +++ b/drivers/nvme/host/multipath.c > @@ -443,6 +443,8 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) > goto out; > blk_queue_flag_set(QUEUE_FLAG_NONROT, q); > blk_queue_flag_set(QUEUE_FLAG_NOWAIT, q); > + blk_queue_flag_set(QUEUE_FLAG_POLL_CAPABLE, q); > + blk_queue_flag_set(QUEUE_FLAG_POLL, q); After POLL_CAPABLE is enabled on nvme mpath, POLL can be disabled via queue_poll_store(). However, blk_mq_freeze_queue() just blocks and drain bio submission, then pending POLL bio can't be polled any more because QUEUE_FLAG_POLL is checked in bio_poll(). Thanks, Ming
