TTY: switch tty_insert_flip_char

Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

tty_insert_flip_char is the next one to proceed. This one is used all
over the code, so the patch is huge.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 8fd1814..7f41124 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -136,7 +136,8 @@
 
 static void handle_rx(struct uart_port *port)
 {
-	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+	struct tty_port *tport = &port->state->port;
+	struct tty_struct *tty = tty_port_tty_get(tport);
 	if (!tty) {
 		/* Discard data: no tty available */
 		int count = (vt8500_read(port, VT8500_URFIDX) & 0x1f00) >> 8;
@@ -151,7 +152,7 @@
 	 */
 	if ((vt8500_read(port, VT8500_URISR) & RXOVER)) {
 		port->icount.overrun++;
-		tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+		tty_insert_flip_char(tport, 0, TTY_OVERRUN);
 	}
 
 	/* and now the main RX loop */
@@ -174,7 +175,7 @@
 		port->icount.rx++;
 
 		if (!uart_handle_sysrq_char(port, c))
-			tty_insert_flip_char(tty, c, flag);
+			tty_insert_flip_char(tport, c, flag);
 	}
 
 	tty_flip_buffer_push(tty);