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rhashtable: Add barrier to ensure we see new tables in walker

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The walker is a lockless reader so it too needs an smp_rmb before
reading the future_tbl field in order to see any new tables that
may contain elements that we should have walked over.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2015-03-24 00:50:19 +11:00 committed by David S. Miller
parent e167359be0
commit d88252f9bb
1 changed files with 3 additions and 0 deletions
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3
lib/rhashtable.c
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@ -477,6 +477,9 @@ next:
iter->skip = 0;
}
/* Ensure we see any new tables. */
smp_rmb();
iter->walker->tbl = rht_dereference_rcu(tbl->future_tbl, ht);
if (iter->walker->tbl) {
iter->slot = 0;