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authorPeter Hurley <peter@hurleysoftware.com>2014-10-16 15:33:22 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-05 16:34:36 -0800
commit6460fbbf476ad8d4f4196534c00019975b33e1db (patch)
treee3bc22df1f753a369bb23ecd4a308e605ee92d30 /drivers/tty/tty_ioctl.c
parenta361858da327263e04dc521ca39091d3119ccff8 (diff)
downloadlinux-6460fbbf476ad8d4f4196534c00019975b33e1db.tar.bz2
tty: WARN for attempted set_termios() of pty master
The pty master's termios should never be set; currently, all code paths which call the driver's set_termios() method ensure that the pty slave's termios is being set. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_ioctl.c')
-rw-r--r--drivers/tty/tty_ioctl.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 62380ccf70fb..ab4562c06af4 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -528,6 +528,8 @@ EXPORT_SYMBOL(tty_termios_hw_change);
* is a bit of layering violation here with n_tty in terms of the
* internal knowledge of this function.
*
+ * A master pty's termios should never be set.
+ *
* Locking: termios_rwsem
*/
@@ -537,6 +539,8 @@ int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
struct tty_ldisc *ld;
unsigned long flags;
+ WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+ tty->driver->subtype == PTY_TYPE_MASTER);
/*
* Perform the actual termios internal changes under lock.
*/