[bug report] rxrpc: Make the I/O thread take over the call and local processor work

[David Howells]

How about the attached?

David
---
commit bba0f024db5a5ced0b7e3c7236fc6661aa55fb8f
Author: David Howells <dhowells at redhat.com>
Date:   Thu Dec 15 13:48:47 2022 +0000

    rxrpc: Fix the return value of rxrpc_new_incoming_call()
    
    Dan Carpenter sayeth[1]:
    
      The patch 5e6ef4f1017c: "rxrpc: Make the I/O thread take over the
      call and local processor work" from Jan 23, 2020, leads to the
      following Smatch static checker warning:
    
            net/rxrpc/io_thread.c:283 rxrpc_input_packet()
            warn: bool is not less than zero.
    
    Fix this (for now) by changing rxrpc_new_incoming_call() to return an int
    with 0 or error code rather than bool.
    
    Reported-by: Dan Carpenter <error27 at gmail.com>
    Signed-off-by: David Howells <dhowells at redhat.com>
    cc: Marc Dionne <marc.dionne at auristor.com>
    cc: linux-afs at lists.infradead.org
    Link: http://lists.infradead.org/pipermail/linux-afs/2022-December/006123.html [1]

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 5b732a4af009..18092526d3c8 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -812,9 +812,9 @@ extern struct workqueue_struct *rxrpc_workqueue;
  */
 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 void rxrpc_discard_prealloc(struct rxrpc_sock *);
-bool rxrpc_new_incoming_call(struct rxrpc_local *, struct rxrpc_peer *,
-			     struct rxrpc_connection *, struct sockaddr_rxrpc *,
-			     struct sk_buff *);
+int rxrpc_new_incoming_call(struct rxrpc_local *, struct rxrpc_peer *,
+			    struct rxrpc_connection *, struct sockaddr_rxrpc *,
+			    struct sk_buff *);
 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
 
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index d1850863507f..c02401656fa9 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -326,11 +326,11 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
  * If we want to report an error, we mark the skb with the packet type and
  * abort code and return false.
  */
-bool rxrpc_new_incoming_call(struct rxrpc_local *local,
-			     struct rxrpc_peer *peer,
-			     struct rxrpc_connection *conn,
-			     struct sockaddr_rxrpc *peer_srx,
-			     struct sk_buff *skb)
+int rxrpc_new_incoming_call(struct rxrpc_local *local,
+			    struct rxrpc_peer *peer,
+			    struct rxrpc_connection *conn,
+			    struct sockaddr_rxrpc *peer_srx,
+			    struct sk_buff *skb)
 {
 	const struct rxrpc_security *sec = NULL;
 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
@@ -342,7 +342,7 @@ bool rxrpc_new_incoming_call(struct rxrpc_local *local,
 	/* Don't set up a call for anything other than the first DATA packet. */
 	if (sp->hdr.seq != 1 ||
 	    sp->hdr.type != RXRPC_PACKET_TYPE_DATA)
-		return true; /* Just discard */
+		return 0; /* Just discard */
 
 	rcu_read_lock();
 
@@ -413,7 +413,7 @@ bool rxrpc_new_incoming_call(struct rxrpc_local *local,
 	_leave(" = %p{%d}", call, call->debug_id);
 	rxrpc_input_call_event(call, skb);
 	rxrpc_put_call(call, rxrpc_call_put_input);
-	return true;
+	return 0;
 
 unsupported_service:
 	trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
@@ -425,10 +425,10 @@ bool rxrpc_new_incoming_call(struct rxrpc_local *local,
 reject:
 	rcu_read_unlock();
 	_leave(" = f [%u]", skb->mark);
-	return false;
+	return -EPROTO;
 discard:
 	rcu_read_unlock();
-	return true;
+	return 0;
 }
 
 /*
diff --git a/net/rxrpc/io_thread.c b/net/rxrpc/io_thread.c
index e6b9f0ceae17..1ad067d66fb6 100644
--- a/net/rxrpc/io_thread.c
+++ b/net/rxrpc/io_thread.c
@@ -292,7 +292,7 @@ static int rxrpc_input_packet(struct rxrpc_local *local, struct sk_buff **_skb)
 	skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
 reject_packet:
 	rxrpc_reject_packet(local, skb);
-	return ret;
+	return 0;
 }
 
 /*
@@ -384,7 +384,7 @@ static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
 		if (rxrpc_to_client(sp))
 			goto bad_message;
 		if (rxrpc_new_incoming_call(conn->local, conn->peer, conn,
-					    peer_srx, skb))
+					    peer_srx, skb) == 0)
 			return 0;
 		goto reject_packet;
 	}