[PATCH] add klist_node_attached() to determine if a node is on a list or not.

[Greg KH]

[PATCH] add klist_node_attached() to determine if a node is on a list or not.

Signed-off-by: Patrick Mochel <mochel@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

diff -Nru a/include/linux/klist.h b/include/linux/klist.h

---
commit 8b0c250be489dcbf1a3a33bb4ec4c7f33735a365
tree 17935d1064101df10ad7bb2f7ed94e6a88af295c
parent 2287c322b61fced7e0c326a1a9606aa73147e3df
author mochel@xxxxxxxxxxxxxxxxxx <mochel@xxxxxxxxxxxxxxxxxx> Thu, 24 Mar 2005 12:58:57 -0800
committer Greg Kroah-Hartman <gregkh@xxxxxxx> Mon, 20 Jun 2005 15:15:17 -0700

 include/linux/klist.h |    2 ++
 lib/klist.c           |   16 ++++++++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/include/linux/klist.h b/include/linux/klist.h
--- a/include/linux/klist.h
+++ b/include/linux/klist.h
@@ -37,6 +37,8 @@ extern void klist_add_head(struct klist 
 extern void klist_del(struct klist_node * n);
 extern void klist_remove(struct klist_node * n);
 
+extern int klist_node_attached(struct klist_node * n);
+
 
 struct klist_iter {
 	struct klist		* i_klist;
diff --git a/lib/klist.c b/lib/klist.c
--- a/lib/klist.c
+++ b/lib/klist.c
@@ -112,6 +112,7 @@ static void klist_release(struct kref * 
 	struct klist_node * n = container_of(kref, struct klist_node, n_ref);
 	list_del(&n->n_node);
 	complete(&n->n_removed);
+	n->n_klist = NULL;
 }
 
 static int klist_dec_and_del(struct klist_node * n)
@@ -154,6 +155,19 @@ EXPORT_SYMBOL_GPL(klist_remove);
 
 
 /**
+ *	klist_node_attached - Say whether a node is bound to a list or not.
+ *	@n:	Node that we're testing.
+ */
+
+int klist_node_attached(struct klist_node * n)
+{
+	return (n->n_klist != NULL);
+}
+
+EXPORT_SYMBOL_GPL(klist_node_attached);
+
+
+/**
  *	klist_iter_init_node - Initialize a klist_iter structure.
  *	@k:	klist we're iterating.
  *	@i:	klist_iter we're filling.
@@ -246,3 +260,5 @@ struct klist_node * klist_next(struct kl
 }
 
 EXPORT_SYMBOL_GPL(klist_next);
+
+

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