[PATCH] ppp: disconnect on hangup (synctty)

Here is the hangup implementation for ppp_synctty.c (same as patch
previously for ppp_asynctty.c)

Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/net/ppp_synctty.c

@@ -284,6 +284,18 @@ ppp_sync_close(struct tty_struct *tty)
 	kfree(ap);
 }
 
+/*
+ * Called on tty hangup in process context.
+ *
+ * Wait for I/O to driver to complete and unregister PPP channel.
+ * This is already done by the close routine, so just call that.
+ */
+static int ppp_sync_hangup(struct tty_struct *tty)
+{
+	ppp_sync_close(tty);
+	return 0;
+}
+
 /*
  * Read does nothing - no data is ever available this way.
  * Pppd reads and writes packets via /dev/ppp instead.
@@ -422,6 +434,7 @@ static struct tty_ldisc ppp_sync_ldisc = {
 	.name	= "pppsync",
 	.open	= ppp_sync_open,
 	.close	= ppp_sync_close,
+	.hangup	= ppp_sync_hangup,
 	.read	= ppp_sync_read,
 	.write	= ppp_sync_write,
 	.ioctl	= ppp_synctty_ioctl,