From: Gao Xiang <gaoxiang25@xxxxxxxxxx>
Just like other generic locks, insert a full barrier
in case of memory reorder.
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
---
drivers/staging/erofs/internal.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index 399a7003e783..892944355867 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -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();
}
--
2.11.0
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