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-rw-r--r--block/blk-throttle.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index f1bcb5c320e8..38aed8baacf4 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -638,9 +638,6 @@ static struct throtl_grp *
throtl_rb_first(struct throtl_service_queue *parent_sq)
{
struct rb_node *n;
- /* Service tree is empty */
- if (!parent_sq->nr_pending)
- return NULL;
n = rb_first_cached(&parent_sq->pending_tree);
WARN_ON_ONCE(!n);
@@ -1224,9 +1221,13 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
unsigned int nr_disp = 0;
while (1) {
- struct throtl_grp *tg = throtl_rb_first(parent_sq);
+ struct throtl_grp *tg;
struct throtl_service_queue *sq;
+ if (!parent_sq->nr_pending)
+ break;
+
+ tg = throtl_rb_first(parent_sq);
if (!tg)
break;