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authorHerbert Xu <herbert@gondor.apana.org.au>2015-12-19 05:45:28 +0300
committerDavid S. Miller <davem@davemloft.net>2015-12-19 07:44:18 +0300
commit179ccc0a73641ffd24e44ff10a7bd494efe98d8d (patch)
treee0a36b2c0879b531ccd9f0e8707e59afbc474f7b /lib/rhashtable.c
parente905eabc90a5b787d8708df164543ee295bea5f2 (diff)
downloadlinux-179ccc0a73641ffd24e44ff10a7bd494efe98d8d.tar.xz
rhashtable: Kill harmless RCU warning in rhashtable_walk_init
The commit c6ff5268293ef98e48a99597e765ffc417e39fa5 ("rhashtable: Fix walker list corruption") causes a suspicious RCU usage warning because we no longer hold ht->mutex when we dereference ht->tbl. However, this is a false positive because we now hold ht->lock which also guarantees that ht->tbl won't disppear from under us. This patch kills the warning by using rcu_dereference_protected. Reported-by: kernel test robot <ying.huang@linux.intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/rhashtable.c')
-rw-r--r--lib/rhashtable.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index eb9240c458fa..51282f579760 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -519,7 +519,8 @@ int rhashtable_walk_init(struct rhashtable *ht, struct rhashtable_iter *iter)
return -ENOMEM;
spin_lock(&ht->lock);
- iter->walker->tbl = rht_dereference(ht->tbl, ht);
+ iter->walker->tbl =
+ rcu_dereference_protected(ht->tbl, lockdep_is_held(&ht->lock));
list_add(&iter->walker->list, &iter->walker->tbl->walkers);
spin_unlock(&ht->lock);