[PATCH v4 3/5] ublk: merge stop_work and quiesce_work

[Uday Shankar <ushankar@purestorage.com>]

Save some lines by merging stop_work and quiesce_work into nosrv_work,
which looks at the recovery flags and does the right thing when the "no
ublk server" condition is detected.

Signed-off-by: Uday Shankar <ushankar@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
---
 drivers/block/ublk_drv.c | 64 ++++++++++++++++------------------------
 1 file changed, 25 insertions(+), 39 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index a838ba809445..d5edef7bde43 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -182,8 +182,7 @@ struct ublk_device {
 	unsigned int		nr_queues_ready;
 	unsigned int		nr_privileged_daemon;
 
-	struct work_struct	quiesce_work;
-	struct work_struct	stop_work;
+	struct work_struct	nosrv_work;
 };
 
 /* header of ublk_params */
@@ -1261,10 +1260,7 @@ static enum blk_eh_timer_return ublk_timeout(struct request *rq)
 		struct ublk_device *ub = ubq->dev;
 
 		if (ublk_abort_requests(ub, ubq)) {
-			if (ublk_nosrv_should_stop_dev(ub))
-				schedule_work(&ub->stop_work);
-			else
-				schedule_work(&ub->quiesce_work);
+			schedule_work(&ub->nosrv_work);
 		}
 		return BLK_EH_DONE;
 	}
@@ -1514,10 +1510,7 @@ static void ublk_uring_cmd_cancel_fn(struct io_uring_cmd *cmd,
 	ublk_cancel_cmd(ubq, io, issue_flags);
 
 	if (need_schedule) {
-		if (ublk_nosrv_should_stop_dev(ub))
-			schedule_work(&ub->stop_work);
-		else
-			schedule_work(&ub->quiesce_work);
+		schedule_work(&ub->nosrv_work);
 	}
 }
 
@@ -1580,20 +1573,6 @@ static void __ublk_quiesce_dev(struct ublk_device *ub)
 	ub->dev_info.state = UBLK_S_DEV_QUIESCED;
 }
 
-static void ublk_quiesce_work_fn(struct work_struct *work)
-{
-	struct ublk_device *ub =
-		container_of(work, struct ublk_device, quiesce_work);
-
-	mutex_lock(&ub->mutex);
-	if (ub->dev_info.state != UBLK_S_DEV_LIVE)
-		goto unlock;
-	__ublk_quiesce_dev(ub);
- unlock:
-	mutex_unlock(&ub->mutex);
-	ublk_cancel_dev(ub);
-}
-
 static void ublk_unquiesce_dev(struct ublk_device *ub)
 {
 	int i;
@@ -1642,6 +1621,25 @@ static void ublk_stop_dev(struct ublk_device *ub)
 	ublk_cancel_dev(ub);
 }
 
+static void ublk_nosrv_work(struct work_struct *work)
+{
+	struct ublk_device *ub =
+		container_of(work, struct ublk_device, nosrv_work);
+
+	if (ublk_nosrv_should_stop_dev(ub)) {
+		ublk_stop_dev(ub);
+		return;
+	}
+
+	mutex_lock(&ub->mutex);
+	if (ub->dev_info.state != UBLK_S_DEV_LIVE)
+		goto unlock;
+	__ublk_quiesce_dev(ub);
+ unlock:
+	mutex_unlock(&ub->mutex);
+	ublk_cancel_dev(ub);
+}
+
 /* device can only be started after all IOs are ready */
 static void ublk_mark_io_ready(struct ublk_device *ub, struct ublk_queue *ubq)
 {
@@ -2155,14 +2153,6 @@ static int ublk_add_chdev(struct ublk_device *ub)
 	return ret;
 }
 
-static void ublk_stop_work_fn(struct work_struct *work)
-{
-	struct ublk_device *ub =
-		container_of(work, struct ublk_device, stop_work);
-
-	ublk_stop_dev(ub);
-}
-
 /* align max io buffer size with PAGE_SIZE */
 static void ublk_align_max_io_size(struct ublk_device *ub)
 {
@@ -2187,8 +2177,7 @@ static int ublk_add_tag_set(struct ublk_device *ub)
 static void ublk_remove(struct ublk_device *ub)
 {
 	ublk_stop_dev(ub);
-	cancel_work_sync(&ub->stop_work);
-	cancel_work_sync(&ub->quiesce_work);
+	cancel_work_sync(&ub->nosrv_work);
 	cdev_device_del(&ub->cdev, &ub->cdev_dev);
 	ublk_put_device(ub);
 	ublks_added--;
@@ -2448,8 +2437,7 @@ static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd)
 		goto out_unlock;
 	mutex_init(&ub->mutex);
 	spin_lock_init(&ub->lock);
-	INIT_WORK(&ub->quiesce_work, ublk_quiesce_work_fn);
-	INIT_WORK(&ub->stop_work, ublk_stop_work_fn);
+	INIT_WORK(&ub->nosrv_work, ublk_nosrv_work);
 
 	ret = ublk_alloc_dev_number(ub, header->dev_id);
 	if (ret < 0)
@@ -2584,9 +2572,7 @@ static inline void ublk_ctrl_cmd_dump(struct io_uring_cmd *cmd)
 static int ublk_ctrl_stop_dev(struct ublk_device *ub)
 {
 	ublk_stop_dev(ub);
-	cancel_work_sync(&ub->stop_work);
-	cancel_work_sync(&ub->quiesce_work);
-
+	cancel_work_sync(&ub->nosrv_work);
 	return 0;
 }
 
-- 
2.34.1