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From: NeilBrown <neilb@suse.com>
To: Thomas Graf <tgraf@suug.ch>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/4] rhashtable: reset iter when rhashtable_walk_start sees new table
Date: Tue, 24 Apr 2018 08:29:13 +1000	[thread overview]
Message-ID: <152452255348.1456.1629211529227597992.stgit@noble> (raw)
In-Reply-To: <152452244405.1456.8175298512483573078.stgit@noble>

The documentation claims that when rhashtable_walk_start_check()
detects a resize event, it will rewind back to the beginning
of the table.  This is not true.  We need to set ->slot and
->skip to be zero for it to be true.

Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NeilBrown <neilb@suse.com>
---
 lib/rhashtable.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 6d490f51174e..81edf1ab38ab 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -737,6 +737,8 @@ int rhashtable_walk_start_check(struct rhashtable_iter *iter)
 
 	if (!iter->walker.tbl && !iter->end_of_table) {
 		iter->walker.tbl = rht_dereference_rcu(ht->tbl, ht);
+		iter->slot = 0;
+		iter->skip = 0;
 		return -EAGAIN;
 	}
 

  parent reply	other threads:[~2018-04-23 22:30 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-23 22:29 [PATCH 0/4] A few rhashtables cleanups NeilBrown
2018-04-23 22:29 ` [PATCH 4/4] rhashtable: improve rhashtable_walk stability when stop/start used NeilBrown
2018-07-05 11:20   ` [4/4] " Paolo Abeni
2018-07-05 22:56     ` NeilBrown
2018-07-07 22:11     ` NeilBrown
2018-04-23 22:29 ` [PATCH 2/4] rhashtable: Revise incorrect comment on r{hl, hash}table_walk_enter() NeilBrown
2018-04-23 22:29 ` NeilBrown [this message]
2018-04-23 22:29 ` [PATCH 1/4] rhashtable: remove outdated comments about grow_decision etc NeilBrown
2018-04-24 17:38 ` [PATCH 0/4] A few rhashtables cleanups David Miller

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