[Qemu-devel] [PATCH v2 04/11] block: use refcnt for device attach/detach

[Fam Zheng <famz@redhat.com>]

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block.c b/block.c
index 7b46669..57a3876 100644
--- a/block.c
+++ b/block.c
@@ -1622,6 +1622,7 @@ int bdrv_attach_dev(BlockDriverState *bs, void *dev)
         return -EBUSY;
     }
     bs->dev = dev;
+    bdrv_ref(bs, false);
     bdrv_iostatus_reset(bs);
     return 0;
 }
@@ -1639,6 +1640,7 @@ void bdrv_detach_dev(BlockDriverState *bs, void *dev)
 {
     assert(bs->dev == dev);
     bs->dev = NULL;
+    bdrv_unref(bs, false);
     bs->dev_ops = NULL;
     bs->dev_opaque = NULL;
     bs->buffer_alignment = 512;
-- 
1.8.3.2