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, 2 insertions, 1 deletions

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index e9a0abc6a32f..4ff2503a1bb8 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -554,6 +554,7 @@ int parse_chan_pair(char *str, struct line *line, int device,
 
 void chan_interrupt(struct line *line, struct tty_struct *tty, int irq)
 {
+        struct tty_port *port = &line->port;
         struct chan *chan = line->chan_in;
         int err;
         char c;
@@ -562,7 +563,7 @@ void chan_interrupt(struct line *line, struct tty_struct *tty, int irq)
                 goto out;
 
         do {
-                if (tty && !tty_buffer_request_room(tty, 1)) {
+                if (!tty_buffer_request_room(port, 1)) {
                         schedule_delayed_work(&line->task, 1);
                         goto out;
                 }