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| author | Grant Likely <grant.likely@secretlab.ca> | 2011-02-28 01:36:21 -0700 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-02-28 01:36:21 -0700 |
| commit | 38a5d6736e7f714cc56d58692001e66dcbb98799 (patch) | |
| tree | 337d32375e10b04642013710c2c424514474b32c /block/blk-throttle.c | |
| parent | 0bfd95a2a104dfc2469d68de52df99939371c0d4 (diff) | |
| parent | f5412be599602124d2bdd49947b231dd77c0bf99 (diff) | |
Merge commit 'v2.6.38-rc6' into devicetree/next
Conflicts:
drivers/spi/pxa2xx_spi_pci.c
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 381b09bb562b..a89043a3caa4 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -168,7 +168,15 @@ static struct throtl_grp * throtl_find_alloc_tg(struct throtl_data *td, * tree of blkg (instead of traversing through hash list all * the time. */ - tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key)); + + /* + * This is the common case when there are no blkio cgroups. + * Avoid lookup in this case + */ + if (blkcg == &blkio_root_cgroup) + tg = &td->root_tg; + else + tg = tg_of_blkg(blkiocg_lookup_group(blkcg, key)); /* Fill in device details for root group */ if (tg && !tg->blkg.dev && bdi->dev && dev_name(bdi->dev)) { |