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cgroup: cgroup_idr_lock should be bh

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cgroup_idr_remove() can be invoked from bh leading to lockdep
detecting possible AA deadlock (IN_BH/ON_BH).  Make the lock bh-safe.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-05-13 12:10:59 -04:00
parent 0cee8b7786
commit 54504e977c
1 changed files with 6 additions and 6 deletions
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12
kernel/cgroup.c
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@ -203,9 +203,9 @@ static int cgroup_idr_alloc(struct idr *idr, void *ptr, int start, int end,
int ret;
idr_preload(gfp_mask);
spin_lock(&cgroup_idr_lock);
spin_lock_bh(&cgroup_idr_lock);
ret = idr_alloc(idr, ptr, start, end, gfp_mask);
spin_unlock(&cgroup_idr_lock);
spin_unlock_bh(&cgroup_idr_lock);
idr_preload_end();
return ret;
}
@ -214,17 +214,17 @@ static void *cgroup_idr_replace(struct idr *idr, void *ptr, int id)
{
void *ret;
spin_lock(&cgroup_idr_lock);
spin_lock_bh(&cgroup_idr_lock);
ret = idr_replace(idr, ptr, id);
spin_unlock(&cgroup_idr_lock);
spin_unlock_bh(&cgroup_idr_lock);
return ret;
}
static void cgroup_idr_remove(struct idr *idr, int id)
{
spin_lock(&cgroup_idr_lock);
spin_lock_bh(&cgroup_idr_lock);
idr_remove(idr, id);
spin_unlock(&cgroup_idr_lock);
spin_unlock_bh(&cgroup_idr_lock);
}
/**