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-rw-r--r--lib/rhashtable.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 811d51b7cb86..6c4f5c8e9baa 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -131,9 +131,11 @@ static union nested_table *nested_table_alloc(struct rhashtable *ht,
INIT_RHT_NULLS_HEAD(ntbl[i].bucket);
}
- rcu_assign_pointer(*prev, ntbl);
-
- return ntbl;
+ if (cmpxchg(prev, NULL, ntbl) == NULL)
+ return ntbl;
+ /* Raced with another thread. */
+ kfree(ntbl);
+ return rcu_dereference(*prev);
}
static struct bucket_table *nested_bucket_table_alloc(struct rhashtable *ht,