diff options
| -rw-r--r-- | lib/idr.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/idr.c b/lib/idr.c index 7a785a0c2ea0..1c4f9281f412 100644 --- a/lib/idr.c +++ b/lib/idr.c @@ -220,8 +220,14 @@ build_up: */ while ((layers < (MAX_LEVEL - 1)) && (id >= (1 << (layers*IDR_BITS)))) { layers++; - if (!p->count) + if (!p->count) { + /* special case: if the tree is currently empty, + * then we grow the tree by moving the top node + * upwards. + */ + p->layer++; continue; + } if (!(new = get_from_free_list(idp))) { /* * The allocation failed. If we built part of |