[DECNET]: Fix return codes

This patch fixes the return codes from sendmsg/recvmsg when a signal happens.
Instead of always returning ERESTARTSYS (which confuses X11 rather badly) it
should return EINTR for non-blocking operations.
Signed-off-by: Patrick Caulfield <patrick@tykepenguin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/dn_nsp.h

@@ -37,7 +37,7 @@ extern int dn_nsp_rx(struct sk_buff *);
 extern int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
 
 extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri);
-extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, int *err);
+extern struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err);
 
 #define NSP_REASON_OK 0		/* No error */
 #define NSP_REASON_NR 1		/* No resources */

net/decnet/af_decnet.c

@@ -1723,7 +1723,7 @@ static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
 			goto out;
 
 		if (signal_pending(current)) {
-			rv = -ERESTARTSYS;
+			rv = sock_intr_errno(timeo);
 			goto out;
 		}
 
@@ -1957,7 +1957,7 @@ static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
 			goto out;
 
 		if (signal_pending(current)) {
-			err = -ERESTARTSYS;
+			err = sock_intr_errno(timeo);
 			goto out;
 		}
 
@@ -1992,7 +1992,7 @@ static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
 		/*
 		 * Get a suitably sized skb.
 		 */
-		skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, &err);
+		skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, timeo, &err);
 
 		if (err)
 			break;

net/decnet/dn_nsp_out.c

@@ -141,7 +141,7 @@ struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri)
  * whole size thats been asked for (plus 11 bytes of header). If this
  * fails, then we try for any size over 16 bytes for SOCK_STREAMS.
  */
-struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, int *err)
+struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err)
 {
 	int space;
 	int len;
@@ -151,7 +151,7 @@ struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, in
 
 	while(skb == NULL) {
 		if (signal_pending(current)) {
-			*err = ERESTARTSYS;
+			*err = sock_intr_errno(timeo);
 			break;
 		}