diff --git a/include/block/block_int.h b/include/block/block_int.h
index 737ec632c4..dd2de6bd1d 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -1308,7 +1308,6 @@ BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
                                   const char *child_name,
                                   const BdrvChildClass *child_class,
                                   BdrvChildRole child_role,
-                                  AioContext *ctx,
                                   uint64_t perm, uint64_t shared_perm,
                                   void *opaque, Error **errp);
 void bdrv_root_unref_child(BdrvChild *child);
diff --git a/block.c b/block.c
index 2c80fc1639..61703027ec 100644
--- a/block.c
+++ b/block.c
@@ -2666,13 +2666,13 @@ BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
                                   const char *child_name,
                                   const BdrvChildClass *child_class,
                                   BdrvChildRole child_role,
-                                  AioContext *ctx,
                                   uint64_t perm, uint64_t shared_perm,
                                   void *opaque, Error **errp)
 {
     BdrvChild *child;
     Error *local_err = NULL;
     int ret;
+    AioContext *ctx;
 
     ret = bdrv_check_update_perm(child_bs, NULL, perm, shared_perm, NULL, errp);
     if (ret < 0) {
@@ -2692,6 +2692,8 @@ BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
         .opaque         = opaque,
     };
 
+    ctx = bdrv_child_get_parent_aio_context(child);
+
     /* If the AioContexts don't match, first try to move the subtree of
      * child_bs into the AioContext of the new parent. If this doesn't work,
      * try moving the parent into the AioContext of child_bs instead. */
@@ -2752,8 +2754,8 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
                     perm, shared_perm, &perm, &shared_perm);
 
     child = bdrv_root_attach_child(child_bs, child_name, child_class,
-                                   child_role, bdrv_get_aio_context(parent_bs),
-                                   perm, shared_perm, parent_bs, errp);
+                                   child_role, perm, shared_perm, parent_bs,
+                                   errp);
     if (child == NULL) {
         return NULL;
     }
diff --git a/block/block-backend.c b/block/block-backend.c
index 3f656ef361..e4892fd6a5 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -435,7 +435,7 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
 
     blk->root = bdrv_root_attach_child(bs, "root", &child_root,
                                        BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
-                                       blk->ctx, perm, BLK_PERM_ALL, blk, errp);
+                                       perm, BLK_PERM_ALL, blk, errp);
     if (!blk->root) {
         blk_unref(blk);
         return NULL;
@@ -849,7 +849,7 @@ int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
     bdrv_ref(bs);
     blk->root = bdrv_root_attach_child(bs, "root", &child_root,
                                        BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
-                                       blk->ctx, blk->perm, blk->shared_perm,
+                                       blk->perm, blk->shared_perm,
                                        blk, errp);
     if (blk->root == NULL) {
         return -EPERM;
diff --git a/blockjob.c b/blockjob.c
index 160bf38b19..2fe1d788ba 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -229,8 +229,7 @@ int block_job_add_bdrv(BlockJob *job, const char *name, BlockDriverState *bs,
     if (need_context_ops && job->job.aio_context != qemu_get_aio_context()) {
         aio_context_release(job->job.aio_context);
     }
-    c = bdrv_root_attach_child(bs, name, &child_job, 0,
-                               job->job.aio_context, perm, shared_perm, job,
+    c = bdrv_root_attach_child(bs, name, &child_job, 0, perm, shared_perm, job,
                                errp);
     if (need_context_ops && job->job.aio_context != qemu_get_aio_context()) {
         aio_context_acquire(job->job.aio_context);
