diff --git a/block/io.c b/block/io.c
index 0a8cbefe86e125a7829d671dd8484a8abc4540bd..51d8f943a4b79a2d13c9f139ff666d542b6e7e62 100644
--- a/block/io.c
+++ b/block/io.c
@@ -828,20 +828,16 @@ bdrv_find_conflicting_request(BdrvTrackedRequest *self)
 }
 
 /* Called with self->bs->reqs_lock held */
-static bool coroutine_fn
+static void coroutine_fn
 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, &self->bs->reqs_lock);
         self->waiting_for = NULL;
-        waited = true;
     }
-
-    return waited;
 }
 
 /* Called with req->bs->reqs_lock held */
@@ -934,36 +930,31 @@ void bdrv_dec_in_flight(BlockDriverState *bs)
     bdrv_wakeup(bs);
 }
 
-static bool coroutine_fn bdrv_wait_serialising_requests(BdrvTrackedRequest *self)
+static void coroutine_fn
+bdrv_wait_serialising_requests(BdrvTrackedRequest *self)
 {
     BlockDriverState *bs = self->bs;
-    bool waited = false;
 
     if (!qatomic_read(&bs->serialising_in_flight)) {
-        return false;
+        return;
     }
 
     qemu_co_mutex_lock(&bs->reqs_lock);
-    waited = bdrv_wait_serialising_requests_locked(self);
+    bdrv_wait_serialising_requests_locked(self);
     qemu_co_mutex_unlock(&bs->reqs_lock);
-
-    return waited;
 }
 
-bool coroutine_fn bdrv_make_request_serialising(BdrvTrackedRequest *req,
+void coroutine_fn bdrv_make_request_serialising(BdrvTrackedRequest *req,
                                                 uint64_t align)
 {
-    bool waited;
     IO_CODE();
 
     qemu_co_mutex_lock(&req->bs->reqs_lock);
 
     tracked_request_set_serialising(req, align);
-    waited = bdrv_wait_serialising_requests_locked(req);
+    bdrv_wait_serialising_requests_locked(req);
 
     qemu_co_mutex_unlock(&req->bs->reqs_lock);
-
-    return waited;
 }
 
 int bdrv_check_qiov_request(int64_t offset, int64_t bytes,
diff --git a/include/block/block_int-io.h b/include/block/block_int-io.h
index 91cdd616927d3f567cae33906837b2b8ebb12fca..4b0b3e17efa5b25736fad18b6880a26f3528f067 100644
--- a/include/block/block_int-io.h
+++ b/include/block/block_int-io.h
@@ -73,7 +73,7 @@ static inline int coroutine_fn bdrv_co_pwrite(BdrvChild *child,
     return bdrv_co_pwritev(child, offset, bytes, &qiov, flags);
 }
 
-bool coroutine_fn bdrv_make_request_serialising(BdrvTrackedRequest *req,
+void coroutine_fn bdrv_make_request_serialising(BdrvTrackedRequest *req,
                                                 uint64_t align);
 BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_request(BlockDriverState *bs);