cfq-iosched: Fix wrong children_weight calculation

[cascardo/linux.git] / block / cfq-iosched.c

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index cadc378..d749463 100644 (file)
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1275,12 +1275,16 @@ __cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg)
 static void
 cfq_update_group_weight(struct cfq_group *cfqg)
 {
-       BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
-
        if (cfqg->new_weight) {
                cfqg->weight = cfqg->new_weight;
                cfqg->new_weight = 0;
        }
+}
+
+static void
+cfq_update_group_leaf_weight(struct cfq_group *cfqg)
+{
+       BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
 
        if (cfqg->new_leaf_weight) {
                cfqg->leaf_weight = cfqg->new_leaf_weight;
@@ -1299,7 +1303,7 @@ cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg)
        /* add to the service tree */
        BUG_ON(!RB_EMPTY_NODE(&cfqg->rb_node));
 
-       cfq_update_group_weight(cfqg);
+       cfq_update_group_leaf_weight(cfqg);
        __cfq_group_service_tree_add(st, cfqg);
 
        /*
@@ -1323,6 +1327,7 @@ cfq_group_service_tree_add(struct cfq_rb_root *st, struct cfq_group *cfqg)
         */
        while ((parent = cfqg_parent(pos))) {
                if (propagate) {
+                       cfq_update_group_weight(pos);
                        propagate = !parent->nr_active++;
                        parent->children_weight += pos->weight;
                }