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rxrpc: Allow listen(sock, 0) to be used to disable listening

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Allow listen() with a backlog of 0 to be used to disable listening on an
AF_RXRPC socket.  This also releases any preallocation, thereby making it
easier for a kernel service to account for all allocated call structures
when shutting down the service.

The socket cannot thereafter have listening reenabled, but must rather be
closed and reopened.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2017-01-05 10:38:36 +00:00
parent 56ff9c8377
commit 210f035316
3 changed files with 11 additions and 1 deletions
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3
net/rxrpc/call_accept.c
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@@ -349,7 +349,8 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
found_service:
spin_lock(&rx->incoming_lock);
if (rx->sk.sk_state == RXRPC_CLOSE) {
if (rx->sk.sk_state == RXRPC_SERVER_LISTEN_DISABLED ||
rx->sk.sk_state == RXRPC_CLOSE) {
trace_rxrpc_abort("CLS", sp->hdr.cid, sp->hdr.callNumber,
sp->hdr.seq, RX_INVALID_OPERATION, ESHUTDOWN);
skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT;