rxrpc: Carry call state out of locked section in rxrpc_rotate_tx_window()

Carry the call state out of the locked section in rxrpc_rotate_tx_window()
rather than sampling it afterwards.  This is only used to select tracepoint
data, but could have changed by the time we do the tracepoint.

Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 8834aa6..af8ce64 100644 (file)
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -278,23 +278,26 @@ static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to,
 static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
                               const char *abort_why)
 {
+       unsigned int state;
 
        ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags));
 
        write_lock(&call->state_lock);
 
-       switch (call->state) {
+       state = call->state;
+       switch (state) {
        case RXRPC_CALL_CLIENT_SEND_REQUEST:
        case RXRPC_CALL_CLIENT_AWAIT_REPLY:
                if (reply_begun)
-                       call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
+                       call->state = state = RXRPC_CALL_CLIENT_RECV_REPLY;
                else
-                       call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
+                       call->state = state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
                break;
 
        case RXRPC_CALL_SERVER_AWAIT_ACK:
                __rxrpc_call_completed(call);
                rxrpc_notify_socket(call);
+               state = call->state;
                break;
 
        default:
@@ -302,11 +305,10 @@ static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
        }
 
        write_unlock(&call->state_lock);
-       if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) {
+       if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
                trace_rxrpc_transmit(call, rxrpc_transmit_await_reply);
-       } else {
+       else
                trace_rxrpc_transmit(call, rxrpc_transmit_end);
-       }
        _leave(" = ok");
        return true;