Li Zefan f50daa704f
cgroup: no need to check css refs for release notification ...
We no longer fail rmdir() when there're still css refs, so we don't
need to check css refs in check_for_release().
This also voids a bug. cgroup_has_css_refs() accesses subsys[i]
without cgroup_mutex, so it can race with cgroup_unload_subsys().
cgroup_has_css_refs()
...
if (ss == NULL || ss->root != cgrp->root)
if ss pointers to net_cls_subsys, and cls_cgroup module is unloaded
right after the former check but before the latter, the memory that
net_cls_subsys resides has become invalid.
Signed-off-by: Li Zefan <lizefan@huawei.com >
Signed-off-by: Tejun Heo <tj@kernel.org >
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