From fdade4f69e4ca29753963f858dc42c5f8faf1d0b Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Mon, 4 Sep 2017 15:28:28 +0100
Subject: [PATCH] rxrpc: Make service connection lookup always check for retry
When an RxRPC service packet comes in, the target connection is looked up
by an rb-tree search under RCU and a read-locked seqlock; the seqlock retry
check is, however, currently skipped if we got a match, but probably
shouldn't be in case the connection we found gets replaced whilst we're
doing a search.
Make the lookup procedure always go through need_seqretry(), even if the
lookup was successful. This makes sure we always pick up on a write-lock
event.
On the other hand, since we don't take a ref on the object, but rely on RCU
to prevent its destruction after dropping the seqlock, I'm not sure this is
necessary.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/rxrpc/conn_service.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/net/rxrpc/conn_service.c b/net/rxrpc/conn_service.c
index e60fcd2a4a021..f6fcdb3130a19 100644
--- a/net/rxrpc/conn_service.c
+++ b/net/rxrpc/conn_service.c
@@ -50,12 +50,11 @@ struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *peer,
else if (conn->proto.index_key > k.index_key)
p = rcu_dereference_raw(p->rb_right);
else
- goto done;
+ break;
conn = NULL;
}
} while (need_seqretry(&peer->service_conn_lock, seq));
-done:
done_seqretry(&peer->service_conn_lock, seq);
_leave(" = %d", conn ? conn->debug_id : -1);
return conn;
--
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