[PATCH v24 11/18] blk-zoned: Document disk_zone_wplug_schedule_bio_work() locking

[Bart Van Assche <bvanassche@acm.org>]

Before adding more code in disk_zone_wplug_schedule_bio_work() that depends
on the zone write plug lock being held, document that all callers hold this
lock.

Cc: Damien Le Moal <dlemoal@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 block/blk-zoned.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index eb81278acb38..627a952477d1 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -785,6 +785,8 @@ static bool blk_zone_wplug_handle_reset_all(struct bio *bio)
 static void disk_zone_wplug_schedule_bio_work(struct gendisk *disk,
 					      struct blk_zone_wplug *zwplug)
 {
+	lockdep_assert_held(&zwplug->lock);
+
 	/*
 	 * Take a reference on the zone write plug and schedule the submission
 	 * of the next plugged BIO. blk_zone_wplug_bio_work() will release the