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authorGui Jianfeng <guijianfeng@cn.fujitsu.com>2010-02-26 08:56:15 +0100
committerJens Axboe <jens.axboe@oracle.com>2010-02-26 08:56:15 +0100
commit024f9066165ffe9c8284431c78adcbcddd309831 (patch)
tree11b64dd7861985aca57bd7624cd25c804afd4b1a /block/cfq-iosched.c
parent7f03292ee16e68be96aa88904afc6152f8d37736 (diff)
cfq: Remove useless css reference get
There's no need to take css reference here, for the caller has already called rcu_read_lock() to prevent cgroup from being removed. Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index e3dedfd3bcb..10eb286f1f4 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -951,10 +951,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
struct backing_dev_info *bdi = &cfqd->queue->backing_dev_info;
unsigned int major, minor;
- /* Do we need to take this reference */
- if (!blkiocg_css_tryget(blkcg))
- return NULL;;
-
cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
if (cfqg || !create)
goto done;
@@ -985,7 +981,6 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list);
done:
- blkiocg_css_put(blkcg);
return cfqg;
}