[Qemu-stable] [PATCH 3/5] io: add locking constraints check into bdrv_drain to ensure locking

[Denis V. Lunev]

as described in the comment of the function

Signed-off-by: Denis V. Lunev <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Paolo Bonzini <address@hidden>
---
 block/io.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/block/io.c b/block/io.c
index 5ac6256..2e98d45 100644
--- a/block/io.c
+++ b/block/io.c
@@ -247,12 +247,15 @@ bool bdrv_requests_pending(BlockDriverState *bs)
 void bdrv_drain(BlockDriverState *bs)
 {
     bool busy = true;
+    AioContext *aio_context = bdrv_get_aio_context(bs);
+
+    assert(aio_context_is_locked(aio_context));
 
     while (busy) {
         /* Keep iterating */
          bdrv_flush_io_queue(bs);
          busy = bdrv_requests_pending(bs);
-         busy |= aio_poll(bdrv_get_aio_context(bs), busy);
+         busy |= aio_poll(aio_context, busy);
     }
 }
 
-- 
2.1.4