NVMe: Remove the kthread from the wait queue

Once there are no more bios on the congestion list, we can stop waking
up the nvme kthread every time a completion happens.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index cf89db8..8d3c0b7 100644 (file)
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -1162,6 +1162,9 @@ static void nvme_resubmit_bios(struct nvme_queue *nvmeq)
                        bio_list_add_head(&nvmeq->sq_cong, bio);
                        break;
                }
+               if (bio_list_empty(&nvmeq->sq_cong))
+                       remove_wait_queue(&nvmeq->sq_full,
+                                                       &nvmeq->sq_cong_wait);
        }
 }