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authorPeter Hurley <peter@hurleysoftware.com>2014-10-16 15:33:23 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-05 16:34:36 -0800
commitdbfcd851a9ee0bf6952e538be75230b7c071dafb (patch)
tree83a8d040432dd90ad72c48f5f2158a753f47409a /drivers/tty/pty.c
parent6460fbbf476ad8d4f4196534c00019975b33e1db (diff)
tty: Move pty-specific set_termios() handling to pty driver
Packet mode is unique to the pty driver; move the packet mode state change code from the generic tty ioctl handler to the pty driver. 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/pty.c')
-rw-r--r--drivers/tty/pty.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 6c7602592fe0..7f612c524224 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -259,6 +259,34 @@ out:
static void pty_set_termios(struct tty_struct *tty,
struct ktermios *old_termios)
{
+ unsigned long flags;
+
+ /* See if packet mode change of state. */
+ if (tty->link && tty->link->packet) {
+ int extproc = (old_termios->c_lflag & EXTPROC) |
+ (tty->termios.c_lflag & EXTPROC);
+ int old_flow = ((old_termios->c_iflag & IXON) &&
+ (old_termios->c_cc[VSTOP] == '\023') &&
+ (old_termios->c_cc[VSTART] == '\021'));
+ int new_flow = (I_IXON(tty) &&
+ STOP_CHAR(tty) == '\023' &&
+ START_CHAR(tty) == '\021');
+ if ((old_flow != new_flow) || extproc) {
+ spin_lock_irqsave(&tty->ctrl_lock, flags);
+ if (old_flow != new_flow) {
+ tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
+ if (new_flow)
+ tty->ctrl_status |= TIOCPKT_DOSTOP;
+ else
+ tty->ctrl_status |= TIOCPKT_NOSTOP;
+ }
+ if (extproc)
+ tty->ctrl_status |= TIOCPKT_IOCTL;
+ spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+ wake_up_interruptible(&tty->link->read_wait);
+ }
+ }
+
tty->termios.c_cflag &= ~(CSIZE | PARENB);
tty->termios.c_cflag |= (CS8 | CREAD);
}

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