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writeback, cgroup: remove extra percpu_ref_exit()

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5.10 stable commit 2b00b2a0e6 ("writeback, cgroup: fix null-ptr-deref
write in bdi_split_work_to_wbs") is a backport of upstream 6.3 commit
1ba1199ec574.

In the 5.10 stable commit backport percpu_ref_exit() is called twice:
first in cgwb_release_workfn() and then in cgwb_free_rcu(). The 2nd call
is benign as percpu_ref_exit() internally detects there's nothing to do.

This fixes an non-upstream issue that only applies to 5.10.y.

Fixes: 2b00b2a0e6 ("writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs")
Signed-off-by: Greg Thelen <gthelen@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Thelen 2023-05-20 12:46:24 -07:00 committed by Greg Kroah-Hartman
parent 84fbe6ad0f
commit 047f618d19
1 changed files with 0 additions and 1 deletions
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mm/backing-dev.c
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@ -404,7 +404,6 @@ static void cgwb_release_workfn(struct work_struct *work)
blkcg_unpin_online(blkcg); blkcg_unpin_online(blkcg);
fprop_local_destroy_percpu(&wb->memcg_completions); fprop_local_destroy_percpu(&wb->memcg_completions);
percpu_ref_exit(&wb->refcnt);
wb_exit(wb); wb_exit(wb);
call_rcu(&wb->rcu, cgwb_free_rcu); call_rcu(&wb->rcu, cgwb_free_rcu);
} }