2 files changed, 19 insertions, 0 deletions

diff --git a/lib/.gitignore b/lib/.gitignore
new file mode 100644
index 000000000000..3bef1ea94c99
--- /dev/null
+++ b/lib/.gitignore
@@ -0,0 +1,6 @@
+#
+# Generated files
+#
+gen_crc32table
+crc32table.h
+
diff --git a/lib/idr.c b/lib/idr.c
index 6415d053e2bf..d4df21debc4d 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -346,6 +346,19 @@ void idr_remove(struct idr *idp, int id)
 EXPORT_SYMBOL(idr_remove);
 
 /**
+ * idr_destroy - release all cached layers within an idr tree
+ * idp: idr handle
+ */
+void idr_destroy(struct idr *idp)
+{
+        while (idp->id_free_cnt) {
+                struct idr_layer *p = alloc_layer(idp);
+                kmem_cache_free(idr_layer_cache, p);
+        }
+}
+EXPORT_SYMBOL(idr_destroy);
+
+/**
  * idr_find - return pointer for given id
  * @idp: idr handle
  * @id: lookup key