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rxrpc: Calls should only have one terminal state

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Condense the terminal states of a call state machine to a single state,
plus a separate completion type value.  The value is then set, along with
error and abort code values, only when the call is transitioned to the
completion state.

Helpers are provided to simplify this.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2016-08-30 09:49:28 +01:00
parent ccbd3dbe85
commit f5c17aaeb2
12 changed files with 226 additions and 184 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
net/rxrpc/conn_event.c
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@@ -27,8 +27,8 @@
/*
* Retransmit terminal ACK or ABORT of the previous call.
*/
static void rxrpc_conn_retransmit(struct rxrpc_connection *conn,
struct sk_buff *skb)
static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
struct sk_buff *skb)
{
struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
struct rxrpc_channel *chan;
@@ -135,14 +135,21 @@ static void rxrpc_conn_retransmit(struct rxrpc_connection *conn,
/*
* pass a connection-level abort onto all calls on that connection
*/
static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
u32 abort_code)
static void rxrpc_abort_calls(struct rxrpc_connection *conn,
enum rxrpc_call_completion compl,
u32 abort_code, int error)
{
struct rxrpc_call *call;
int i;
bool queue;
int i, bit;
_enter("{%d},%x", conn->debug_id, abort_code);
if (compl == RXRPC_CALL_LOCALLY_ABORTED)
bit = RXRPC_CALL_EV_CONN_ABORT;
else
bit = RXRPC_CALL_EV_RCVD_ABORT;
spin_lock(&conn->channel_lock);
for (i = 0; i < RXRPC_MAXCALLS; i++) {
@@ -151,20 +158,14 @@ static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
lockdep_is_held(&conn->channel_lock));
if (call) {
write_lock_bh(&call->state_lock);
if (call->state <= RXRPC_CALL_COMPLETE) {
call->state = state;
if (state == RXRPC_CALL_LOCALLY_ABORTED) {
call->local_abort = conn->local_abort;
set_bit(RXRPC_CALL_EV_CONN_ABORT,
&call->events);
} else {
call->remote_abort = conn->remote_abort;
set_bit(RXRPC_CALL_EV_RCVD_ABORT,
&call->events);
}
rxrpc_queue_call(call);
if (rxrpc_set_call_completion(call, compl, abort_code,
error)) {
set_bit(bit, &call->events);
queue = true;
}
write_unlock_bh(&call->state_lock);
if (queue)
rxrpc_queue_call(call);
}
}
@@ -190,17 +191,16 @@ static int rxrpc_abort_connection(struct rxrpc_connection *conn,
/* generate a connection-level abort */
spin_lock_bh(&conn->state_lock);
if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
conn->state = RXRPC_CONN_LOCALLY_ABORTED;
conn->error = error;
spin_unlock_bh(&conn->state_lock);
} else {
if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
spin_unlock_bh(&conn->state_lock);
_leave(" = 0 [already dead]");
return 0;
}
rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
conn->state = RXRPC_CONN_LOCALLY_ABORTED;
spin_unlock_bh(&conn->state_lock);
rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
msg.msg_name = &conn->params.peer->srx.transport;
msg.msg_namelen = conn->params.peer->srx.transport_len;
@@ -280,7 +280,7 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
switch (sp->hdr.type) {
case RXRPC_PACKET_TYPE_DATA:
case RXRPC_PACKET_TYPE_ACK:
rxrpc_conn_retransmit(conn, skb);
rxrpc_conn_retransmit_call(conn, skb);
rxrpc_free_skb(skb);
return 0;
@@ -291,7 +291,7 @@ static int rxrpc_process_event(struct rxrpc_connection *conn,
_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
conn->state = RXRPC_CONN_REMOTELY_ABORTED;
rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
rxrpc_abort_calls(conn, 0, RXRPC_CALL_REMOTELY_ABORTED,
abort_code);
return -ECONNABORTED;