X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=lib%2Fidr.c;h=80ca9aca038be447573b8130cbc22c1133f34867;hb=13bba6fda98fe03a955665c9d4bf63c8fd9c19c0;hp=dab4bca86f5d1981027c0be5104a69ce7d05fbe9;hpb=5a54bd1307471c1cd0521402fe65e2057edcab2f;p=karo-tx-linux.git

diff --git a/lib/idr.c b/lib/idr.c
index dab4bca86f5d..80ca9aca038b 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -578,6 +578,52 @@ int idr_for_each(struct idr *idp,
 }
 EXPORT_SYMBOL(idr_for_each);
 
+/**
+ * idr_get_next - lookup next object of id to given id.
+ * @idp: idr handle
+ * @id:  pointer to lookup key
+ *
+ * Returns pointer to registered object with id, which is next number to
+ * given id.
+ */
+
+void *idr_get_next(struct idr *idp, int *nextidp)
+{
+	struct idr_layer *p, *pa[MAX_LEVEL];
+	struct idr_layer **paa = &pa[0];
+	int id = *nextidp;
+	int n, max;
+
+	/* find first ent */
+	n = idp->layers * IDR_BITS;
+	max = 1 << n;
+	p = rcu_dereference(idp->top);
+	if (!p)
+		return NULL;
+
+	while (id < max) {
+		while (n > 0 && p) {
+			n -= IDR_BITS;
+			*paa++ = p;
+			p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]);
+		}
+
+		if (p) {
+			*nextidp = id;
+			return p;
+		}
+
+		id += 1 << n;
+		while (n < fls(id)) {
+			n += IDR_BITS;
+			p = *--paa;
+		}
+	}
+	return NULL;
+}
+
+
+
 /**
  * idr_replace - replace pointer for given id
  * @idp: idr handle