TTY: switch tty_buffer_request_room to tty_port

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

Here we start with tty_buffer_request_room.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c
index 81d5cb9b6569..9b2232a78ff9 100644
--- a/arch/mn10300/kernel/mn10300-serial.c
+++ b/arch/mn10300/kernel/mn10300-serial.c
@@ -524,7 +524,8 @@ static int mask_test_and_clear(volatile u8 *ptr, u8 mask)
 static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
 {
         struct uart_icount *icount = &port->uart.icount;
-        struct tty_struct *tty = port->uart.state->port.tty;
+        struct tty_port *port = &port->uart.state->port;
+        struct tty_struct *tty = port->tty;
         unsigned ix;
         int count;
         u8 st, ch, push, status, overrun;
@@ -534,7 +535,7 @@ static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
         push = 0;
 
         count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
-        count = tty_buffer_request_room(tty, count);
+        count = tty_buffer_request_room(port, count);
         if (count == 0) {
                 if (!tty->low_latency)
                         tty_flip_buffer_push(tty);