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, 4 insertions, 2 deletions

diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index 4c00c5550b1a..3969e54744cc 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -521,6 +521,7 @@ void jsm_input(struct jsm_channel *ch)
 {
         struct jsm_board *bd;
         struct tty_struct *tp;
+        struct tty_port *port;
         u32 rmask;
         u16 head;
         u16 tail;
@@ -536,7 +537,8 @@ void jsm_input(struct jsm_channel *ch)
         if (!ch)
                 return;
 
-        tp = ch->uart_port.state->port.tty;
+        port = &ch->uart_port.state->port;
+        tp = port->tty;
 
         bd = ch->ch_bd;
         if(!bd)
@@ -600,7 +602,7 @@ void jsm_input(struct jsm_channel *ch)
                 return;
         }
 
-        len = tty_buffer_request_room(tp, data_len);
+        len = tty_buffer_request_room(port, data_len);
         n = len;
 
         /*