From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

We don't need this check: bdrv_set_backing_noperm() will do it anyway
(actually in bdrv_attach_child_common()).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210610120537.196183-4-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c | 33 ---------------------------------
 1 file changed, 33 deletions(-)

diff --git a/block.c b/block.c
index 14711ce7ab..69dc9d188d 100644
--- a/block.c
+++ b/block.c
@@ -4215,29 +4215,6 @@ int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only,
     return ret;
 }
 
-static bool bdrv_reopen_can_attach(BlockDriverState *parent,
-                                   BdrvChild *child,
-                                   BlockDriverState *new_child,
-                                   Error **errp)
-{
-    AioContext *parent_ctx = bdrv_get_aio_context(parent);
-    AioContext *child_ctx = bdrv_get_aio_context(new_child);
-    GSList *ignore;
-    bool ret;
-
-    ignore = g_slist_prepend(NULL, child);
-    ret = bdrv_can_set_aio_context(new_child, parent_ctx, &ignore, NULL);
-    g_slist_free(ignore);
-    if (ret) {
-        return ret;
-    }
-
-    ignore = g_slist_prepend(NULL, child);
-    ret = bdrv_can_set_aio_context(parent, child_ctx, &ignore, errp);
-    g_slist_free(ignore);
-    return ret;
-}
-
 /*
  * Take a BDRVReopenState and check if the value of 'backing' in the
  * reopen_state->options QDict is valid or not.
@@ -4289,16 +4266,6 @@ static int bdrv_reopen_parse_backing(BDRVReopenState *reopen_state,
         g_assert_not_reached();
     }
 
-    /*
-     * Check AioContext compatibility so that the bdrv_set_backing_hd() call in
-     * bdrv_reopen_commit() won't fail.
-     */
-    if (new_backing_bs) {
-        if (!bdrv_reopen_can_attach(bs, bs->backing, new_backing_bs, errp)) {
-            return -EINVAL;
-        }
-    }
-
     /*
      * Ensure that @bs can really handle backing files, because we are
      * about to give it one (or swap the existing one)
-- 
2.31.1