Commit 194a0837 authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman

staging: erofs: add a full barrier in erofs_workgroup_unfreeze

commit 948bbdb1 upstream.

Just like other generic locks, insert a full barrier
in case of memory reorder.
Reviewed-by: 's avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: 's avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 78c46113
......@@ -209,6 +209,11 @@ static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp,
static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp,
int orig_val)
{
/*
* other observers should notice all modifications
* in the freezing period.
*/
smp_mb();
atomic_set(&grp->refcount, orig_val);
preempt_enable();
}
......
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