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Revert "cgroup: avoid attaching a cgroup root to two different superblocks"

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This reverts commit bfb0b80db5.

Andrei reports CRIU test hangs with the patch applied.  The bug fixed
by the patch isn't too likely to trigger in actual uses.  Revert the
patch for now.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Andrei Vagin <avagin@virtuozzo.com>
Link: http://lkml.kernel.org/r/20170414232737.GC20350@outlook.office365.com
This commit is contained in:
Tejun Heo 2017-04-16 23:17:37 +09:00
parent bfb0b80db5
commit 330c418638
1 changed files with 1 additions and 1 deletions
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2
kernel/cgroup/cgroup-v1.c
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@ -1146,7 +1146,7 @@ struct dentry *cgroup1_mount(struct file_system_type *fs_type, int flags,
* path is super cold. Let's just sleep a bit and retry.
*/
pinned_sb = kernfs_pin_sb(root->kf_root, NULL);
if (IS_ERR_OR_NULL(pinned_sb) ||
if (IS_ERR(pinned_sb) ||
!percpu_ref_tryget_live(&root->cgrp.self.refcnt)) {
mutex_unlock(&cgroup_mutex);
if (!IS_ERR_OR_NULL(pinned_sb))