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-rw-r--r--block/blk-cgroup.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 2ff74ffcbb27..05b893de516b 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -844,6 +844,8 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
goto free_blkcg;
}
+ mutex_lock(&blkcg_pol_mutex);
+
for (i = 0; i < BLKCG_MAX_POLS ; i++) {
struct blkcg_policy *pol = blkcg_policy[i];
struct blkcg_policy_data *cpd;
@@ -860,6 +862,7 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
BUG_ON(blkcg->pd[i]);
cpd = kzalloc(pol->cpd_size, GFP_KERNEL);
if (!cpd) {
+ mutex_unlock(&blkcg_pol_mutex);
ret = ERR_PTR(-ENOMEM);
goto free_pd_blkcg;
}
@@ -868,6 +871,7 @@ blkcg_css_alloc(struct cgroup_subsys_state *parent_css)
pol->cpd_init_fn(blkcg);
}
+ mutex_unlock(&blkcg_pol_mutex);
done:
spin_lock_init(&blkcg->lock);
INIT_RADIX_TREE(&blkcg->blkg_tree, GFP_ATOMIC);