1 files changed, 116 insertions, 119 deletions

diff --git a/lib/klist.c b/lib/klist.c
index 120bd175aa78..cca37f96faa2 100644
--- a/lib/klist.c
+++ b/lib/klist.c
@@ -1,38 +1,37 @@
 /*
- *      klist.c - Routines for manipulating klists.
+ * klist.c - Routines for manipulating klists.
  *
+ * Copyright (C) 2005 Patrick Mochel
  *
- *      This klist interface provides a couple of structures that wrap around 
- *      struct list_head to provide explicit list "head" (struct klist) and 
- *      list "node" (struct klist_node) objects. For struct klist, a spinlock
- *      is included that protects access to the actual list itself. struct 
- *      klist_node provides a pointer to the klist that owns it and a kref
- *      reference count that indicates the number of current users of that node
- *      in the list.
+ * This file is released under the GPL v2.
  *
- *      The entire point is to provide an interface for iterating over a list
- *      that is safe and allows for modification of the list during the
- *      iteration (e.g. insertion and removal), including modification of the
- *      current node on the list.
+ * This klist interface provides a couple of structures that wrap around
+ * struct list_head to provide explicit list "head" (struct klist) and list
+ * "node" (struct klist_node) objects. For struct klist, a spinlock is
+ * included that protects access to the actual list itself. struct
+ * klist_node provides a pointer to the klist that owns it and a kref
+ * reference count that indicates the number of current users of that node
+ * in the list.
  *
- *      It works using a 3rd object type - struct klist_iter - that is declared
- *      and initialized before an iteration. klist_next() is used to acquire the
- *      next element in the list. It returns NULL if there are no more items.
- *      Internally, that routine takes the klist's lock, decrements the reference
- *      count of the previous klist_node and increments the count of the next
- *      klist_node. It then drops the lock and returns.
+ * The entire point is to provide an interface for iterating over a list
+ * that is safe and allows for modification of the list during the
+ * iteration (e.g. insertion and removal), including modification of the
+ * current node on the list.
  *
- *      There are primitives for adding and removing nodes to/from a klist. 
- *      When deleting, klist_del() will simply decrement the reference count. 
- *      Only when the count goes to 0 is the node removed from the list. 
- *      klist_remove() will try to delete the node from the list and block
- *      until it is actually removed. This is useful for objects (like devices)
- *      that have been removed from the system and must be freed (but must wait
- *      until all accessors have finished).
+ * It works using a 3rd object type - struct klist_iter - that is declared
+ * and initialized before an iteration. klist_next() is used to acquire the
+ * next element in the list. It returns NULL if there are no more items.
+ * Internally, that routine takes the klist's lock, decrements the
+ * reference count of the previous klist_node and increments the count of
+ * the next klist_node. It then drops the lock and returns.
  *
- *      Copyright (C) 2005 Patrick Mochel
- *
- *      This file is released under the GPL v2.
+ * There are primitives for adding and removing nodes to/from a klist.
+ * When deleting, klist_del() will simply decrement the reference count.
+ * Only when the count goes to 0 is the node removed from the list.
+ * klist_remove() will try to delete the node from the list and block until
+ * it is actually removed. This is useful for objects (like devices) that
+ * have been removed from the system and must be freed (but must wait until
+ * all accessors have finished).
  */
 
 #include <linux/klist.h>
@@ -40,10 +39,10 @@
 
 
 /**
- *      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)
+ * 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
@@ -51,8 +50,7 @@
  * functions that take and release references on the embedding
  * objects.
  */
-
-void klist_init(struct klist * k, void (*get)(struct klist_node *),
+void klist_init(struct klist *k, void (*get)(struct klist_node *),
                 void (*put)(struct klist_node *))
 {
         INIT_LIST_HEAD(&k->k_list);
@@ -60,26 +58,23 @@ void klist_init(struct klist * k, void (*get)(struct klist_node *),
         k->get = get;
         k->put = put;
 }
-
 EXPORT_SYMBOL_GPL(klist_init);
 
-
-static void add_head(struct klist * k, struct klist_node * n)
+static void add_head(struct klist *k, struct klist_node *n)
 {
         spin_lock(&k->k_lock);
         list_add(&n->n_node, &k->k_list);
         spin_unlock(&k->k_lock);
 }
 
-static void add_tail(struct klist * k, struct klist_node * n)
+static void add_tail(struct klist *k, struct klist_node *n)
 {
         spin_lock(&k->k_lock);
         list_add_tail(&n->n_node, &k->k_list);
         spin_unlock(&k->k_lock);
 }
 
-
-static void klist_node_init(struct klist * k, struct klist_node * n)
+static void klist_node_init(struct klist *k, struct klist_node *n)
 {
         INIT_LIST_HEAD(&n->n_node);
         init_completion(&n->n_removed);
@@ -89,60 +84,83 @@ static void klist_node_init(struct klist * k, struct klist_node * n)
                 k->get(n);
 }
 
-
 /**
- *      klist_add_head - Initialize a klist_node and add it to front.
- *      @n:     node we're adding.
- *      @k:     klist it's going on.
+ * klist_add_head - Initialize a klist_node and add it to front.
+ * @n: node we're adding.
+ * @k: klist it's going on.
  */
-
-void klist_add_head(struct klist_node * n, struct klist * k)
+void klist_add_head(struct klist_node *n, struct klist *k)
 {
         klist_node_init(k, n);
         add_head(k, n);
 }
-
 EXPORT_SYMBOL_GPL(klist_add_head);
 
-
 /**
- *      klist_add_tail - Initialize a klist_node and add it to back.
- *      @n:     node we're adding.
- *      @k:     klist it's going on.
+ * klist_add_tail - Initialize a klist_node and add it to back.
+ * @n: node we're adding.
+ * @k: klist it's going on.
  */
-
-void klist_add_tail(struct klist_node * n, struct klist * k)
+void klist_add_tail(struct klist_node *n, struct klist *k)
 {
         klist_node_init(k, n);
         add_tail(k, n);
 }
-
 EXPORT_SYMBOL_GPL(klist_add_tail);
 
+/**
+ * klist_add_after - Init a klist_node and add it after an existing node
+ * @n: node we're adding.
+ * @pos: node to put @n after
+ */
+void klist_add_after(struct klist_node *n, struct klist_node *pos)
+{
+        struct klist *k = pos->n_klist;
+
+        klist_node_init(k, n);
+        spin_lock(&k->k_lock);
+        list_add(&n->n_node, &pos->n_node);
+        spin_unlock(&k->k_lock);
+}
+EXPORT_SYMBOL_GPL(klist_add_after);
+
+/**
+ * klist_add_before - Init a klist_node and add it before an existing node
+ * @n: node we're adding.
+ * @pos: node to put @n after
+ */
+void klist_add_before(struct klist_node *n, struct klist_node *pos)
+{
+        struct klist *k = pos->n_klist;
+
+        klist_node_init(k, n);
+        spin_lock(&k->k_lock);
+        list_add_tail(&n->n_node, &pos->n_node);
+        spin_unlock(&k->k_lock);
+}
+EXPORT_SYMBOL_GPL(klist_add_before);
 
-static void klist_release(struct kref * kref)
+static void klist_release(struct kref *kref)
 {
-        struct klist_node * n = container_of(kref, struct klist_node, n_ref);
+        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)
+static int klist_dec_and_del(struct klist_node *n)
 {
         return kref_put(&n->n_ref, klist_release);
 }
 
-
 /**
- *      klist_del - Decrement the reference count of node and try to remove.
- *      @n:     node we're deleting.
+ * klist_del - Decrement the reference count of node and try to remove.
+ * @n: node we're deleting.
  */
-
-void klist_del(struct klist_node * n)
+void klist_del(struct klist_node *n)
 {
-        struct klist * k = n->n_klist;
+        struct klist *k = n->n_klist;
         void (*put)(struct klist_node *) = k->put;
 
         spin_lock(&k->k_lock);
@@ -152,48 +170,40 @@ void klist_del(struct klist_node * n)
         if (put)
                 put(n);
 }
-
 EXPORT_SYMBOL_GPL(klist_del);
 
-
 /**
- *      klist_remove - Decrement the refcount of node and wait for it to go away.
- *      @n:     node we're removing.
+ * klist_remove - Decrement the refcount of node and wait for it to go away.
+ * @n: node we're removing.
  */
-
-void klist_remove(struct klist_node * n)
+void klist_remove(struct klist_node *n)
 {
         klist_del(n);
         wait_for_completion(&n->n_removed);
 }
-
 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.
+ * 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)
+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.
- *      @n:     node to start with.
+ * klist_iter_init_node - Initialize a klist_iter structure.
+ * @k: klist we're iterating.
+ * @i: klist_iter we're filling.
+ * @n: node to start with.
  *
- *      Similar to klist_iter_init(), but starts the action off with @n, 
- *      instead of with the list head.
+ * Similar to klist_iter_init(), but starts the action off with @n,
+ * instead of with the list head.
  */
-
-void klist_iter_init_node(struct klist * k, struct klist_iter * i, struct klist_node * n)
+void klist_iter_init_node(struct klist *k, struct klist_iter *i,
+                          struct klist_node *n)
 {
         i->i_klist = k;
         i->i_head = &k->k_list;
@@ -201,66 +211,56 @@ void klist_iter_init_node(struct klist * k, struct klist_iter * i, struct klist_
         if (n)
                 kref_get(&n->n_ref);
 }
-
 EXPORT_SYMBOL_GPL(klist_iter_init_node);
 
-
 /**
- *      klist_iter_init - Iniitalize a klist_iter structure.
- *      @k:     klist we're iterating.
- *      @i:     klist_iter structure we're filling.
+ * klist_iter_init - Iniitalize a klist_iter structure.
+ * @k: klist we're iterating.
+ * @i: klist_iter structure we're filling.
  *
- *      Similar to klist_iter_init_node(), but start with the list head.
+ * Similar to klist_iter_init_node(), but start with the list head.
  */
-
-void klist_iter_init(struct klist * k, struct klist_iter * i)
+void klist_iter_init(struct klist *k, struct klist_iter *i)
 {
         klist_iter_init_node(k, i, NULL);
 }
-
 EXPORT_SYMBOL_GPL(klist_iter_init);
 
-
 /**
- *      klist_iter_exit - Finish a list iteration.
- *      @i:     Iterator structure.
+ * klist_iter_exit - Finish a list iteration.
+ * @i: Iterator structure.
  *
- *      Must be called when done iterating over list, as it decrements the 
- *      refcount of the current node. Necessary in case iteration exited before
- *      the end of the list was reached, and always good form.
+ * Must be called when done iterating over list, as it decrements the
+ * refcount of the current node. Necessary in case iteration exited before
+ * the end of the list was reached, and always good form.
  */
-
-void klist_iter_exit(struct klist_iter * i)
+void klist_iter_exit(struct klist_iter *i)
 {
         if (i->i_cur) {
                 klist_del(i->i_cur);
                 i->i_cur = NULL;
         }
 }
-
 EXPORT_SYMBOL_GPL(klist_iter_exit);
 
-
-static struct klist_node * to_klist_node(struct list_head * n)
+static struct klist_node *to_klist_node(struct list_head *n)
 {
         return container_of(n, struct klist_node, n_node);
 }
 
-
 /**
- *      klist_next - Ante up next node in list.
- *      @i:     Iterator structure.
+ * klist_next - Ante up next node in list.
+ * @i: Iterator structure.
  *
- *      First grab list lock. Decrement the reference count of the previous
- *      node, if there was one. Grab the next node, increment its reference 
- *      count, drop the lock, and return that next node.
+ * First grab list lock. Decrement the reference count of the previous
+ * node, if there was one. Grab the next node, increment its reference
+ * count, drop the lock, and return that next node.
  */
-
-struct klist_node * klist_next(struct klist_iter * i)
+struct klist_node *klist_next(struct klist_iter *i)
 {
-        struct list_head * next;
-        struct klist_node * lnode = i->i_cur;
-        struct klist_node * knode = NULL;
+        struct list_head *next;
+        struct klist_node *lnode = i->i_cur;
+        struct klist_node *knode = NULL;
         void (*put)(struct klist_node *) = i->i_klist->put;
 
         spin_lock(&i->i_klist->k_lock);
@@ -281,7 +281,4 @@ struct klist_node * klist_next(struct klist_iter * i)
                 put(lnode);
         return knode;
 }
-
 EXPORT_SYMBOL_GPL(klist_next);
-
-