diff options
| author | Ingo Molnar <mingo@kernel.org> | 2012-12-08 15:25:06 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-12-08 15:25:06 +0100 |
| commit | f0b9abfb044649bc452fb2fb975ff2fd599cc6a3 (patch) | |
| tree | 7800081c5cb16a4dfee1e57a70f3be90f7b50d9a /block/blk-cgroup.c | |
| parent | Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/... (diff) | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
| download | linux-f0b9abfb044649bc452fb2fb975ff2fd599cc6a3.tar.xz linux-f0b9abfb044649bc452fb2fb975ff2fd599cc6a3.zip | |
Merge branch 'linus' into perf/core
Conflicts:
tools/perf/Makefile
tools/perf/builtin-test.c
tools/perf/perf.h
tools/perf/tests/parse-events.c
tools/perf/util/evsel.h
Signed-off-by: Ingo Molnar <mingo@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 cafcd7431189..d0b770391ad4 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; |