[Qemu-devel] [PATCH 1/3] block: add missed aio_context_acquire around bdrv_set_aio_context

["Denis V. Lunev" <den@openvz.org>]

It is required for bdrv_drain.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/block-backend.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index 19fdaae..07fcfc7 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1065,7 +1065,10 @@ static AioContext *blk_aiocb_get_aio_context(BlockAIOCB *acb)
 void blk_set_aio_context(BlockBackend *blk, AioContext *new_context)
 {
     if (blk->bs) {
+        AioContext *ctx = blk_get_aio_context(blk);
+        aio_context_acquire(ctx);
         bdrv_set_aio_context(blk->bs, new_context);
+        aio_context_release(ctx);
     }
 }
 
-- 
2.5.0