tty: rework break handling

Some hardware needs to do break handling itself and may have partial
support only. Make break_ctl return an error code. Add a tty driver flag
so you can indicate driver hardware side break support.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index b694d430f10..d1fceabe3ae 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -2230,7 +2230,7 @@ static int tiocmset(struct tty_struct *tty, struct file *file,
  * Arguments:           tty             pointer to tty instance data
  *                      break_state     -1=set break condition, 0=clear
  */
-static void mgslpc_break(struct tty_struct *tty, int break_state)
+static int mgslpc_break(struct tty_struct *tty, int break_state)
 {
         MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
         unsigned long flags;
@@ -2240,7 +2240,7 @@ static void mgslpc_break(struct tty_struct *tty, int break_state)
                          __FILE__,__LINE__, info->device_name, break_state);
 
         if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
-                return;
+                return -EINVAL;
 
         spin_lock_irqsave(&info->lock,flags);
         if (break_state == -1)
@@ -2248,6 +2248,7 @@ static void mgslpc_break(struct tty_struct *tty, int break_state)
         else
                 clear_reg_bits(info, CHA+DAFO, BIT6);
         spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
 }
 
 /* Service an IOCTL request