The conditions got reserved. Also make rb_next() and rb_prev() check
for the empty condition.
Signed-off-by: Jens Axboe <[email protected]>
---
block/as-iosched.c | 4 ++--
include/linux/rbtree.h | 2 +-
lib/rbtree.c | 6 ++++++
3 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 1c44ce3..d677029 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -336,7 +336,7 @@ static void as_add_arq_rb(struct as_data
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);
return;
}
@@ -1039,7 +1039,7 @@ static void as_move_to_dispatch(struct a
struct request *rq = arq->request;
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);
ad->antic_status = ANTIC_OFF;
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index 8d5382e..344bc34 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -133,7 +133,7 @@ #define RB_ROOT (struct rb_root) { NULL,
#define rb_entry(ptr, type, member) container_of(ptr, type, member)
#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))
extern void rb_insert_color(struct rb_node *, struct rb_root *);
diff --git a/lib/rbtree.c b/lib/rbtree.c
index 1e55ba1..48499c2 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -322,6 +322,9 @@ struct rb_node *rb_next(struct rb_node *
{
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
as we can. */
if (node->rb_right) {
@@ -348,6 +351,9 @@ struct rb_node *rb_prev(struct rb_node *
{
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
as we can. */
if (node->rb_left) {
--
1.4.1.ged0e0
-
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