[Qemu-devel] [PATCH v2 23/23] block: Make device model's references to BlockBackend strong

[Markus Armbruster <armbru@redhat.com>]

Doesn't make a difference just yet, but it's the right thing to do.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 block/block-backend.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 9c504f3..17285ba 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -251,6 +251,7 @@ int blk_attach_dev(BlockBackend *blk, void *dev)
     if (blk->dev) {
         return -EBUSY;
     }
+    blk_ref(blk);
     blk->dev = dev;
     bdrv_iostatus_reset(blk->bs);
 
@@ -279,9 +280,10 @@ void blk_detach_dev(BlockBackend *blk, void *dev)
 /* TODO change to DeviceState *dev when all users are qdevified */
 {
     assert(blk->dev == dev);
-    blk->dev = NULL;
     blk->dev_ops = NULL;
     blk->dev_opaque = NULL;
+    blk->dev = NULL;
+    blk_unref(blk);
     bdrv_set_guest_block_size(blk->bs, 512);
     qemu_coroutine_adjust_pool_size(-COROUTINE_POOL_RESERVATION);
 }
-- 
1.9.3