[PATCH v4 16/45] block: drop bdrv_detach_child()

[Vladimir Sementsov-Ogievskiy]

The only caller is bdrv_root_unref_child(), let's just do the logic
directly in it. It simplifies further convertion of
bdrv_root_unref_child() to transaction action.

Signed-off-by: Vladimir Sementsov-Ogievskiy <v.sementsov-og@mail.ru>
---
 block.c | 45 +++++++++++++++++++--------------------------
 1 file changed, 19 insertions(+), 26 deletions(-)

diff --git a/block.c b/block.c
index d852daf7c8..378841a546 100644
--- a/block.c
+++ b/block.c
@@ -2948,29 +2948,6 @@ static int bdrv_attach_child_noperm(BlockDriverState 
*parent_bs,
     return 0;
 }
 
-static void bdrv_detach_child(BdrvChild *child)
-{
-    BlockDriverState *old_bs = child->bs;
-
-    bdrv_replace_child_noperm(child, NULL);
-    bdrv_child_free(child);
-
-    if (old_bs) {
-        /*
-         * Update permissions for old node. We're just taking a parent away, so
-         * we're loosening restrictions. Errors of permission update are not
-         * fatal in this case, ignore them.
-         */
-        bdrv_refresh_perms(old_bs, NULL);
-
-        /*
-         * When the parent requiring a non-default AioContext is removed, the
-         * node moves back to the main AioContext
-         */
-        bdrv_try_set_aio_context(old_bs, qemu_get_aio_context(), NULL);
-    }
-}
-
 /*
  * This function steals the reference to child_bs from the caller.
  * That reference is later dropped by bdrv_root_unref_child().
@@ -3053,10 +3030,26 @@ out:
 /* Callers must ensure that child->frozen is false. */
 void bdrv_root_unref_child(BdrvChild *child)
 {
-    BlockDriverState *child_bs;
+    BlockDriverState *child_bs = child->bs;
+
+    bdrv_replace_child_noperm(child, NULL);
+    bdrv_child_free(child);
+
+    if (child_bs) {
+        /*
+         * Update permissions for old node. We're just taking a parent away, so
+         * we're loosening restrictions. Errors of permission update are not
+         * fatal in this case, ignore them.
+         */
+        bdrv_refresh_perms(child_bs, NULL);
+
+        /*
+         * When the parent requiring a non-default AioContext is removed, the
+         * node moves back to the main AioContext
+         */
+        bdrv_try_set_aio_context(child_bs, qemu_get_aio_context(), NULL);
+    }
 
-    child_bs = child->bs;
-    bdrv_detach_child(child);
     bdrv_unref(child_bs);
 }
 
-- 
2.35.1