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cfq: Remove useless css reference get

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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 <[email protected]>
Reviewed-by: Li Zefan <[email protected]>
Acked-by: Vivek Goyal <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Gui Jianfeng 2010-02-26 08:56:15 +01:00 • committed by Jens Axboe
commit 024f906616
3 changed files with 0 additions and 22 deletions
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5
block/cfq-iosched.c
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@ -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;
}