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rhashtable: future table needs to be traversed when remove an object

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When remove an object from hash table, we currently only traverse old
bucket table to check whether the object exists. If the object is not
found in it, we will try again. But in the second search loop, we still
search the object from the old table instead of future table. As a
result, the object may be not removed from hash table especially when
resizing is currently in progress and the object is just saved in the
future table.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Cc: Thomas Graf <tgraf@suug.ch>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2015-01-07 13:41:55 +08:00 committed by David S. Miller
parent db30485408
commit bd6d4db552
1 changed files with 2 additions and 2 deletions
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4
lib/rhashtable.c
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@ -608,10 +608,10 @@ restart:
return true;
}
if (tbl != rht_dereference_rcu(ht->tbl, ht)) {
if (tbl != rht_dereference_rcu(ht->future_tbl, ht)) {
spin_unlock_bh(lock);
tbl = rht_dereference_rcu(ht->tbl, ht);
tbl = rht_dereference_rcu(ht->future_tbl, ht);
hash = head_hashfn(ht, tbl, obj);
lock = bucket_lock(tbl, hash);