ti-st: use tty_write_room

Don't access tty->ops->write_room directly, use tty_write_room helper
instead.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210505091928.22010-22-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
index 05c015140cad9f8181b164e7d7d1f5f3f863b866..7f6976a9f508bde80812eb3e77ee540ad979e806 100644 (file)
--- a/drivers/misc/ti-st/st_core.c
+++ b/drivers/misc/ti-st/st_core.c
@@ -52,13 +52,12 @@ static void remove_channel_from_table(struct st_data_s *st_gdata,
  */
 int st_get_uart_wr_room(struct st_data_s *st_gdata)
 {
-       struct tty_struct *tty;
        if (unlikely(st_gdata == NULL || st_gdata->tty == NULL)) {
                pr_err("tty unavailable to perform write");
                return -1;
        }
-       tty = st_gdata->tty;
-       return tty->ops->write_room(tty);
+
+       return tty_write_room(st_gdata->tty);
 }
 
 /*