When the permissions could not be changed as would be necessary for
updating the keys, reset updating_keys to false so
block_crypto_child_perms() will not continue to try claiming these
permissions.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
---
 block/crypto.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/block/crypto.c b/block/crypto.c
index 5225a68a54..9d5fecbef8 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -781,10 +781,16 @@ static int
 block_crypto_amend_prepare(BlockDriverState *bs, Error **errp)
 {
     BlockCrypto *crypto = bs->opaque;
+    int ret;
 
     /* apply for exclusive read/write permissions to the underlying file */
     crypto->updating_keys = true;
-    return bdrv_child_refresh_perms(bs, bs->file, errp);
+    ret = bdrv_child_refresh_perms(bs, bs->file, errp);
+    if (ret < 0) {
+        /* Well, in this case we will not be updating any keys */
+        crypto->updating_keys = false;
+    }
+    return ret;
 }
 
 static void
-- 
2.34.1