diff options
| author | Thomas Graf <tgraf@suug.ch> | 2012-12-06 13:25:05 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-12-07 23:15:04 +0400 |
| commit | 45122ca26ced7fae41049326a3797a73f961db2e (patch) | |
| tree | 347843ccf9b6a9eb9a4507e07b4c19faf0e59f70 /net/sctp/transport.c | |
| parent | 0b0fe913bf6d551642eb8892ed90be7358906379 (diff) | |
| download | linux-45122ca26ced7fae41049326a3797a73f961db2e.tar.xz | |
sctp: Add RCU protection to assoc->transport_addr_list
peer.transport_addr_list is currently only protected by sk_sock
which is inpractical to acquire for procfs dumping purposes.
This patch adds RCU protection allowing for the procfs readers to
enter RCU read-side critical sections.
Modification of the list continues to be serialized via sk_lock.
V2: Use list_del_rcu() in sctp_association_free() to be safe
Skip transports marked dead when dumping for procfs
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/transport.c')
| -rw-r--r-- | net/sctp/transport.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/net/sctp/transport.c b/net/sctp/transport.c index 310f11eb2206..4e45bb68aef0 100644 --- a/net/sctp/transport.c +++ b/net/sctp/transport.c @@ -163,13 +163,11 @@ void sctp_transport_free(struct sctp_transport *transport) sctp_transport_put(transport); } -/* Destroy the transport data structure. - * Assumes there are no more users of this structure. - */ -static void sctp_transport_destroy(struct sctp_transport *transport) +static void sctp_transport_destroy_rcu(struct rcu_head *head) { - SCTP_ASSERT(transport->dead, "Transport is not dead", return); + struct sctp_transport *transport; + transport = container_of(head, struct sctp_transport, rcu); if (transport->asoc) sctp_association_put(transport->asoc); @@ -180,6 +178,16 @@ static void sctp_transport_destroy(struct sctp_transport *transport) SCTP_DBG_OBJCNT_DEC(transport); } +/* Destroy the transport data structure. + * Assumes there are no more users of this structure. + */ +static void sctp_transport_destroy(struct sctp_transport *transport) +{ + SCTP_ASSERT(transport->dead, "Transport is not dead", return); + + call_rcu(&transport->rcu, sctp_transport_destroy_rcu); +} + /* Start T3_rtx timer if it is not already running and update the heartbeat * timer. This routine is called every time a DATA chunk is sent. */ |