NFC: llcp: Reset RW, LTO, and MIU remote parameters when link goes down

This resets remote parameters in both local and socket llcp structures when the
link goes down. That way, nfc_llcp_getsockopt won't return values corresponding
to the previous link parameters.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

net/nfc/llcp/llcp.c

@@ -47,6 +47,12 @@ void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
 	write_unlock(&l->lock);
 }
 
+void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
+{
+	sock->remote_rw = LLCP_DEFAULT_RW;
+	sock->remote_miu = LLCP_MAX_MIU + 1;
+}
+
 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
 {
 	struct nfc_llcp_local *local = sock->local;
@@ -112,6 +118,7 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
 			}
 
 			if (listen == true) {
+				nfc_llcp_socket_remote_param_init(llcp_sock);
 				bh_unlock_sock(sk);
 				continue;
 			}
@@ -123,6 +130,7 @@ static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
 		 */
 		if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
 		    listen == true) {
+			nfc_llcp_socket_remote_param_init(llcp_sock);
 			bh_unlock_sock(sk);
 			continue;
 		}
@@ -1522,6 +1530,9 @@ void nfc_llcp_mac_is_down(struct nfc_dev *dev)
 	if (local == NULL)
 		return;
 
+	local->remote_miu = LLCP_DEFAULT_MIU;
+	local->remote_lto = LLCP_DEFAULT_LTO;
+
 	/* Close and purge all existing sockets */
 	nfc_llcp_socket_release(local, true, 0);
 }

net/nfc/llcp/llcp.h

@@ -212,6 +212,7 @@ struct nfc_llcp_ui_cb {
 
 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *s);
 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *s);
+void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock);
 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev);
 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local);
 int nfc_llcp_local_put(struct nfc_llcp_local *local);

net/nfc/llcp/sock.c

@@ -933,12 +933,11 @@ struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
 	llcp_sock->dsap = LLCP_SAP_SDP;
 	llcp_sock->rw = LLCP_MAX_RW + 1;
 	llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
-	llcp_sock->remote_rw = LLCP_DEFAULT_RW;
-	llcp_sock->remote_miu = LLCP_MAX_MIU + 1;
 	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
 	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
 	llcp_sock->remote_ready = 1;
 	llcp_sock->reserved_ssap = LLCP_SAP_MAX;
+	nfc_llcp_socket_remote_param_init(llcp_sock);
 	skb_queue_head_init(&llcp_sock->tx_queue);
 	skb_queue_head_init(&llcp_sock->tx_pending_queue);
 	INIT_LIST_HEAD(&llcp_sock->accept_queue);