path: root/net/rxrpc/call_object.c
diff options
authorDavid Howells <dhowells@redhat.com>2018-09-27 15:13:09 +0100
committerDavid Howells <dhowells@redhat.com>2018-09-28 10:33:17 +0100
commitf334430316e7fd37c4821ebec627e27714bb5d76 (patch)
treea8e7fb558d409f5a36ba8104975272ed91b5ab9a /net/rxrpc/call_object.c
parent37a675e768d7606fe8a53e0c459c9b53e121ac20 (diff)
rxrpc: Fix error distribution
Fix error distribution by immediately delivering the errors to all the affected calls rather than deferring them to a worker thread. The problem with the latter is that retries and things can happen in the meantime when we want to stop that sooner. To this end: (1) Stop the error distributor from removing calls from the error_targets list so that peer->lock isn't needed to synchronise against other adds and removals. (2) Require the peer's error_targets list to be accessed with RCU, thereby avoiding the need to take peer->lock over distribution. (3) Don't attempt to affect a call's state if it is already marked complete. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/call_object.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index 9486293fef5c..799f75b6900d 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -400,7 +400,7 @@ void rxrpc_incoming_call(struct rxrpc_sock *rx,
rcu_assign_pointer(conn->channels[chan].call, call);
- hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
+ hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
_net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);