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authorThomas Graf <tgraf@suug.ch>2012-12-06 09:25:05 +0000
committerDavid S. Miller <davem@davemloft.net>2012-12-07 14:15:04 -0500
commit45122ca26ced7fae41049326a3797a73f961db2e (patch)
tree347843ccf9b6a9eb9a4507e07b4c19faf0e59f70 /net/sctp/associola.c
parent0b0fe913bf6d551642eb8892ed90be7358906379 (diff)
downloadop-kernel-dev-45122ca26ced7fae41049326a3797a73f961db2e.zip
op-kernel-dev-45122ca26ced7fae41049326a3797a73f961db2e.tar.gz
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/associola.c')
-rw-r--r--net/sctp/associola.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index ba3f9cc..b45ed1f 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -448,7 +448,7 @@ void sctp_association_free(struct sctp_association *asoc)
/* Release the transport structures. */
list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
transport = list_entry(pos, struct sctp_transport, transports);
- list_del(pos);
+ list_del_rcu(pos);
sctp_transport_free(transport);
}
@@ -568,7 +568,7 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc,
sctp_assoc_update_retran_path(asoc);
/* Remove this peer from the list. */
- list_del(&peer->transports);
+ list_del_rcu(&peer->transports);
/* Get the first transport of asoc. */
pos = asoc->peer.transport_addr_list.next;
@@ -769,7 +769,7 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
peer->state = peer_state;
/* Attach the remote transport to our asoc. */
- list_add_tail(&peer->transports, &asoc->peer.transport_addr_list);
+ list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list);
asoc->peer.transport_count++;
/* If we do not yet have a primary path, set one. */
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