[PATCH v3 04/12] block/io: bdrv_wait_serialising_requests_locked: drop extra bs arg

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

bs is linked in req, so no needs to pass it separately. Most of
tracked-requests API doesn't have bs argument. Actually, after this
patch only tracked_request_begin has it, but it's for purpose.

While being here, also add a comment about what "_locked" is.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 block/io.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/block/io.c b/block/io.c
index 5b96715058..36bbe4b9b1 100644
--- a/block/io.c
+++ b/block/io.c
@@ -761,16 +761,16 @@ bdrv_find_conflicting_request(BdrvTrackedRequest *self)
     return NULL;
 }
 
+/* Called with self->bs->reqs_lock held */
 static bool coroutine_fn
-bdrv_wait_serialising_requests_locked(BlockDriverState *bs,
-                                      BdrvTrackedRequest *self)
+bdrv_wait_serialising_requests_locked(BdrvTrackedRequest *self)
 {
     BdrvTrackedRequest *req;
     bool waited = false;
 
     while ((req = bdrv_find_conflicting_request(self))) {
         self->waiting_for = req;
-        qemu_co_queue_wait(&req->wait_queue, &bs->reqs_lock);
+        qemu_co_queue_wait(&req->wait_queue, &self->bs->reqs_lock);
         self->waiting_for = NULL;
         waited = true;
     }
@@ -794,7 +794,7 @@ bool bdrv_mark_request_serialising(BdrvTrackedRequest *req, uint64_t align)
 
     req->overlap_offset = MIN(req->overlap_offset, overlap_offset);
     req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes);
-    waited = bdrv_wait_serialising_requests_locked(bs, req);
+    waited = bdrv_wait_serialising_requests_locked(req);
     qemu_co_mutex_unlock(&bs->reqs_lock);
     return waited;
 }
@@ -876,7 +876,7 @@ static bool coroutine_fn bdrv_wait_serialising_requests(BdrvTrackedRequest *self
     }
 
     qemu_co_mutex_lock(&bs->reqs_lock);
-    waited = bdrv_wait_serialising_requests_locked(bs, self);
+    waited = bdrv_wait_serialising_requests_locked(self);
     qemu_co_mutex_unlock(&bs->reqs_lock);
 
     return waited;
-- 
2.18.0