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[PATCH] rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prev

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The conditions got reserved. Also make rb_next() and rb_prev() check
for the empty condition.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-07-11 21:15:52 +02:00 committed by Jens Axboe
parent 9817064b68
commit 10fd48f237
3 changed files with 9 additions and 3 deletions
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4
block/as-iosched.c
View File

@ -336,7 +336,7 @@ static void as_add_arq_rb(struct as_data *ad, struct as_rq *arq)
static inline void as_del_arq_rb(struct as_data *ad, struct as_rq *arq) static inline void as_del_arq_rb(struct as_data *ad, struct as_rq *arq)
{ {
if (!RB_EMPTY_NODE(&arq->rb_node)) { if (RB_EMPTY_NODE(&arq->rb_node)) {
WARN_ON(1); WARN_ON(1);
return; return;
} }
@ -1039,7 +1039,7 @@ static void as_move_to_dispatch(struct as_data *ad, struct as_rq *arq)
struct request *rq = arq->request; struct request *rq = arq->request;
const int data_dir = arq->is_sync; const int data_dir = arq->is_sync;
BUG_ON(!RB_EMPTY_NODE(&arq->rb_node)); BUG_ON(RB_EMPTY_NODE(&arq->rb_node));
as_antic_stop(ad); as_antic_stop(ad);
ad->antic_status = ANTIC_OFF; ad->antic_status = ANTIC_OFF;

2
include/linux/rbtree.h
View File

@ -133,7 +133,7 @@ static inline void rb_set_color(struct rb_node *rb, int color)
#define rb_entry(ptr, type, member) container_of(ptr, type, member) #define rb_entry(ptr, type, member) container_of(ptr, type, member)
#define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL) #define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
#define RB_EMPTY_NODE(node) (rb_parent(node) != node) #define RB_EMPTY_NODE(node) (rb_parent(node) == node)
#define RB_CLEAR_NODE(node) (rb_set_parent(node, node)) #define RB_CLEAR_NODE(node) (rb_set_parent(node, node))
extern void rb_insert_color(struct rb_node *, struct rb_root *); extern void rb_insert_color(struct rb_node *, struct rb_root *);

6
lib/rbtree.c
View File

@ -322,6 +322,9 @@ struct rb_node *rb_next(struct rb_node *node)
{ {
struct rb_node *parent; struct rb_node *parent;
if (rb_parent(node) == node)
return NULL;
/* If we have a right-hand child, go down and then left as far /* If we have a right-hand child, go down and then left as far
as we can. */ as we can. */
if (node->rb_right) { if (node->rb_right) {
@ -348,6 +351,9 @@ struct rb_node *rb_prev(struct rb_node *node)
{ {
struct rb_node *parent; struct rb_node *parent;
if (rb_parent(node) == node)
return NULL;
/* If we have a left-hand child, go down and then right as far /* If we have a left-hand child, go down and then right as far
as we can. */ as we can. */
if (node->rb_left) { if (node->rb_left) {