tty: Convert termios_mutex to termios_rwsem

termios is commonly accessed unsafely (especially by N_TTY)
because the existing mutex forces exclusive access.
Convert existing usage.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index c677829baa8b..02af6ccefe6a 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -828,7 +828,7 @@ static inline int resize_screen(struct vc_data *vc, int width, int height,
  *      If the caller passes a tty structure then update the termios winsize
  *      information and perform any necessary signal handling.
  *
- *      Caller must hold the console semaphore. Takes the termios mutex and
+ *      Caller must hold the console semaphore. Takes the termios rwsem and
  *      ctrl_lock of the tty IFF a tty is passed.
  */
 
@@ -972,7 +972,7 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
  *      the actual work.
  *
  *      Takes the console sem and the called methods then take the tty
- *      termios_mutex and the tty ctrl_lock in that order.
+ *      termios_rwsem and the tty ctrl_lock in that order.
  */
 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 {