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-rw-r--r--lib/klist.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/lib/klist.c b/lib/klist.c
index a70c836c5c4c..bb2f3551d50a 100644
--- a/lib/klist.c
+++ b/lib/klist.c
@@ -42,12 +42,23 @@
/**
* klist_init - Initialize a klist structure.
* @k: The klist we're initializing.
+ * @get: The get function for the embedding object (NULL if none)
+ * @put: The put function for the embedding object (NULL if none)
+ *
+ * Initialises the klist structure. If the klist_node structures are
+ * going to be embedded in refcounted objects (necessary for safe
+ * deletion) then the get/put arguments are used to initialise
+ * functions that take and release references on the embedding
+ * objects.
*/
-void klist_init(struct klist * k)
+void klist_init(struct klist * k, void (*get)(struct klist_node *),
+ void (*put)(struct klist_node *))
{
INIT_LIST_HEAD(&k->k_list);
spin_lock_init(&k->k_lock);
+ k->get = get;
+ k->put = put;
}
EXPORT_SYMBOL_GPL(klist_init);
@@ -74,6 +85,8 @@ static void klist_node_init(struct klist * k, struct klist_node * n)
init_completion(&n->n_removed);
kref_init(&n->n_ref);
n->n_klist = k;
+ if (k->get)
+ k->get(n);
}
@@ -110,9 +123,12 @@ EXPORT_SYMBOL_GPL(klist_add_tail);
static void klist_release(struct kref * kref)
{
struct klist_node * n = container_of(kref, struct klist_node, n_ref);
+ void (*put)(struct klist_node *) = n->n_klist->put;
list_del(&n->n_node);
complete(&n->n_removed);
n->n_klist = NULL;
+ if (put)
+ put(n);
}
static int klist_dec_and_del(struct klist_node * n)

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