Commit d88252f9 authored Mar 24, 2015 by Herbert Xu Committed by David S. Miller Mar 23, 2015

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



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>

parent e167359b

lib/rhashtable.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -477,6 +477,9 @@ void rhashtable_walk_next(struct rhashtable_iter iter)
		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;