diff options
| author | Tejun Heo <tj@kernel.org> | 2012-11-06 12:26:23 -0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-11-06 12:26:23 -0800 |
| commit | 5b805f2a7675634fbdf9ac1c9b2256905ab2ea68 (patch) | |
| tree | ee00d1e3d757458d66209b926d274491c6c3f61c /block/blk-cgroup.c | |
| parent | 1db1e31b1ee3ae126ef98f39083b5f213c7b41bf (diff) | |
| parent | 201e72acb2d3821e2de9ce6091e98859c316b29a (diff) | |
Merge branch 'cgroup/for-3.7-fixes' into cgroup/for-3.8
This is to receive device_cgroup fixes so that further device_cgroup
changes can be made in cgroup/for-3.8.
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 6ce36ff98a41..3dc60fc441cb 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -285,6 +285,13 @@ static void blkg_destroy_all(struct request_queue *q) blkg_destroy(blkg); spin_unlock(&blkcg->lock); } + + /* + * root blkg is destroyed. Just clear the pointer since + * root_rl does not take reference on root blkg. + */ + q->root_blkg = NULL; + q->root_rl.blkg = NULL; } static void blkg_rcu_free(struct rcu_head *rcu_head) @@ -326,6 +333,9 @@ struct request_list *__blk_queue_next_rl(struct request_list *rl, */ if (rl == &q->root_rl) { ent = &q->blkg_list; + /* There are no more block groups, hence no request lists */ + if (list_empty(ent)) + return NULL; } else { blkg = container_of(rl, struct blkcg_gq, rl); ent = &blkg->q_node; |