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-rw-r--r--lib/idr.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/idr.c b/lib/idr.c
index ba7d37cf784..1cac726c44b 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -140,7 +140,8 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
id = *starting_id;
restart:
p = idp->top;
- l = p->layer;
+ l = idp->layers;
+ pa[l--] = NULL;
while (1) {
/*
* We run around this while until we reach the leaf node...
@@ -154,8 +155,8 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
oid = id;
id = (id | ((1 << (IDR_BITS * l)) - 1)) + 1;
- /* did id go over the limit? */
- if (id >= (1 << (idp->layers * IDR_BITS))) {
+ /* if already at the top layer, we need to grow */
+ if (!(p = pa[l])) {
*starting_id = id;
return IDR_NEED_TO_GROW;
}