block: kill some useless goto's in blk-cgroup.c
goto has its place, but lets cut back on some of the more
frivolous uses of it.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index d02bbf8..60bb049 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -376,17 +376,16 @@
rcu_read_lock();
css = css_lookup(&blkio_subsys, blkg->blkcg_id);
- if (!css)
- goto out;
-
- blkcg = container_of(css, struct blkio_cgroup, css);
- spin_lock_irqsave(&blkcg->lock, flags);
- if (!hlist_unhashed(&blkg->blkcg_node)) {
- __blkiocg_del_blkio_group(blkg);
- ret = 0;
+ if (css) {
+ blkcg = container_of(css, struct blkio_cgroup, css);
+ spin_lock_irqsave(&blkcg->lock, flags);
+ if (!hlist_unhashed(&blkg->blkcg_node)) {
+ __blkiocg_del_blkio_group(blkg);
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&blkcg->lock, flags);
}
- spin_unlock_irqrestore(&blkcg->lock, flags);
-out:
+
rcu_read_unlock();
return ret;
}
@@ -815,17 +814,15 @@
seq_printf(m, "dev\tweight\n");
blkcg = cgroup_to_blkio_cgroup(cgrp);
- if (list_empty(&blkcg->policy_list))
- goto out;
-
- spin_lock_irq(&blkcg->lock);
- list_for_each_entry(pn, &blkcg->policy_list, node) {
- seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),
- MINOR(pn->dev), pn->weight);
+ if (!list_empty(&blkcg->policy_list)) {
+ spin_lock_irq(&blkcg->lock);
+ list_for_each_entry(pn, &blkcg->policy_list, node) {
+ seq_printf(m, "%u:%u\t%u\n", MAJOR(pn->dev),
+ MINOR(pn->dev), pn->weight);
+ }
+ spin_unlock_irq(&blkcg->lock);
}
- spin_unlock_irq(&blkcg->lock);
-out:
return 0;
}
@@ -917,40 +914,39 @@
struct blkio_policy_node *pn, *pntmp;
rcu_read_lock();
-remove_entry:
- spin_lock_irqsave(&blkcg->lock, flags);
+ do {
+ spin_lock_irqsave(&blkcg->lock, flags);
- if (hlist_empty(&blkcg->blkg_list)) {
+ if (hlist_empty(&blkcg->blkg_list)) {
+ spin_unlock_irqrestore(&blkcg->lock, flags);
+ break;
+ }
+
+ blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group,
+ blkcg_node);
+ key = rcu_dereference(blkg->key);
+ __blkiocg_del_blkio_group(blkg);
+
spin_unlock_irqrestore(&blkcg->lock, flags);
- goto done;
- }
- blkg = hlist_entry(blkcg->blkg_list.first, struct blkio_group,
- blkcg_node);
- key = rcu_dereference(blkg->key);
- __blkiocg_del_blkio_group(blkg);
+ /*
+ * This blkio_group is being unlinked as associated cgroup is
+ * going away. Let all the IO controlling policies know about
+ * this event. Currently this is static call to one io
+ * controlling policy. Once we have more policies in place, we
+ * need some dynamic registration of callback function.
+ */
+ spin_lock(&blkio_list_lock);
+ list_for_each_entry(blkiop, &blkio_list, list)
+ blkiop->ops.blkio_unlink_group_fn(key, blkg);
+ spin_unlock(&blkio_list_lock);
+ } while (1);
- spin_unlock_irqrestore(&blkcg->lock, flags);
-
- /*
- * This blkio_group is being unlinked as associated cgroup is going
- * away. Let all the IO controlling policies know about this event.
- *
- * Currently this is static call to one io controlling policy. Once
- * we have more policies in place, we need some dynamic registration
- * of callback function.
- */
- spin_lock(&blkio_list_lock);
- list_for_each_entry(blkiop, &blkio_list, list)
- blkiop->ops.blkio_unlink_group_fn(key, blkg);
- spin_unlock(&blkio_list_lock);
- goto remove_entry;
-
-done:
list_for_each_entry_safe(pn, pntmp, &blkcg->policy_list, node) {
blkio_policy_delete_node(pn);
kfree(pn);
}
+
free_css_id(&blkio_subsys, &blkcg->css);
rcu_read_unlock();
if (blkcg != &blkio_root_cgroup)