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

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

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/block/as-iosched.c b/block/as-iosched.c
index 6db494333c3a..9d0f15a54c64 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -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)
 {
-        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 as_data *ad, struct as_rq *arq)
         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;