@@ -320,7 +320,6 @@ void rxrpc_process_call(struct work_struct *work)
if (call->state == RXRPC_CALL_COMPLETE) {
del_timer_sync(&call->timer);
- rxrpc_notify_socket(call);
goto out_put;
}
@@ -173,10 +173,9 @@ static void rxrpc_abort_calls(struct rxrpc_connection *conn,
else
trace_rxrpc_rx_abort(call, serial,
conn->abort_code);
- if (rxrpc_set_call_completion(call, compl,
- conn->abort_code,
- conn->error))
- rxrpc_notify_socket(call);
+ rxrpc_set_call_completion(call, compl,
+ conn->abort_code,
+ conn->error);
}
}
@@ -275,7 +275,6 @@ static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
case RXRPC_CALL_SERVER_AWAIT_ACK:
__rxrpc_call_completed(call);
- rxrpc_notify_socket(call);
state = call->state;
break;
@@ -1013,9 +1012,8 @@ static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb)
_proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code);
- if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
- abort_code, -ECONNABORTED))
- rxrpc_notify_socket(call);
+ rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
+ abort_code, -ECONNABORTED);
}
/*
@@ -1102,7 +1100,6 @@ static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx,
spin_lock(&rx->incoming_lock);
__rxrpc_disconnect_call(conn, call);
spin_unlock(&rx->incoming_lock);
- rxrpc_notify_socket(call);
}
/*
@@ -289,9 +289,7 @@ static void rxrpc_distribute_error(struct rxrpc_peer *peer, int error,
hlist_for_each_entry_rcu(call, &peer->error_targets, error_link) {
rxrpc_see_call(call);
- if (call->state < RXRPC_CALL_COMPLETE &&
- rxrpc_set_call_completion(call, compl, 0, -error))
- rxrpc_notify_socket(call);
+ rxrpc_set_call_completion(call, compl, 0, -error);
}
}
@@ -73,6 +73,7 @@ bool __rxrpc_set_call_completion(struct rxrpc_call *call,
call->state = RXRPC_CALL_COMPLETE;
trace_rxrpc_call_complete(call);
wake_up(&call->waitq);
+ rxrpc_notify_socket(call);
return true;
}
return false;
@@ -83,11 +84,13 @@ bool rxrpc_set_call_completion(struct rxrpc_call *call,
u32 abort_code,
int error)
{
- bool ret;
+ bool ret = false;
- write_lock_bh(&call->state_lock);
- ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
- write_unlock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ write_lock_bh(&call->state_lock);
+ ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
+ write_unlock_bh(&call->state_lock);
+ }
return ret;
}
@@ -101,11 +104,13 @@ bool __rxrpc_call_completed(struct rxrpc_call *call)
bool rxrpc_call_completed(struct rxrpc_call *call)
{
- bool ret;
+ bool ret = false;
- write_lock_bh(&call->state_lock);
- ret = __rxrpc_call_completed(call);
- write_unlock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ write_lock_bh(&call->state_lock);
+ ret = __rxrpc_call_completed(call);
+ write_unlock_bh(&call->state_lock);
+ }
return ret;
}
@@ -261,10 +261,8 @@ static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
case -ENETUNREACH:
case -EHOSTUNREACH:
case -ECONNREFUSED:
- if (rxrpc_set_call_completion(call,
- RXRPC_CALL_LOCAL_ERROR,
- 0, ret))
- rxrpc_notify_socket(call);
+ rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
+ 0, ret);
goto out;
}
_debug("need instant resend %d", ret);
Under some circumstances, rxrpc will fail a transmit a packet through the underlying UDP socket (ie. UDP sendmsg returns an error). This may result in a call getting stuck. In the instance being seen, where AFS tries to send a probe to the Volume Location server, tracepoints show the UDP Tx failure (in this case returing error 99 EADDRNOTAVAIL) and then nothing more: afs_make_vl_call: c=0000015d VL.GetCapabilities rxrpc_call: c=0000015d NWc u=1 sp=rxrpc_kernel_begin_call+0x106/0x170 [rxrpc] a=00000000dd89ee8a rxrpc_call: c=0000015d Gus u=2 sp=rxrpc_new_client_call+0x14f/0x580 [rxrpc] a=00000000e20e4b08 rxrpc_call: c=0000015d SEE u=2 sp=rxrpc_activate_one_channel+0x7b/0x1c0 [rxrpc] a=00000000e20e4b08 rxrpc_call: c=0000015d CON u=2 sp=rxrpc_kernel_begin_call+0x106/0x170 [rxrpc] a=00000000e20e4b08 rxrpc_tx_fail: c=0000015d r=1 ret=-99 CallDataNofrag The problem is that if the initial packet fails and the retransmission timer hasn't been started, the call is set to completed and an error is returned from rxrpc_send_data_packet() to rxrpc_queue_packet(). Though rxrpc_instant_resend() is called, this does nothing because the call is marked completed. So rxrpc_notify_socket() isn't called and the error is passed back up to rxrpc_send_data(), rxrpc_kernel_send_data() and thence to afs_make_call() and afs_vl_get_capabilities() where it is simply ignored because it is assumed that the result of a probe will be collected asynchronously. Fileserver probing is similarly affected via afs_fs_get_capabilities(). Fix this by always issuing a notification in __rxrpc_set_call_completion() if it shifts a call to the completed state, even if an error is also returned to the caller through the function return value. Also put in a little bit of optimisation to avoid taking the call state_lock and disabling softirqs if the call is already in the completed state and remove some now redundant rxrpc_notify_socket() calls. Fixes: f5c17aaeb2ae ("rxrpc: Calls should only have one terminal state") Reported-by: Gerry Seidman <gerry@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Marc Dionne <marc.dionne@auristor.com> --- net/rxrpc/call_event.c | 1 - net/rxrpc/conn_event.c | 7 +++---- net/rxrpc/input.c | 7 ++----- net/rxrpc/peer_event.c | 4 +--- net/rxrpc/recvmsg.c | 21 +++++++++++++-------- net/rxrpc/sendmsg.c | 6 ++---- 6 files changed, 21 insertions(+), 25 deletions(-)