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/rocket.c b/drivers/char/rocket.c
index e670eae2f510..584d791e84a6 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -1236,13 +1236,13 @@ static void rp_set_termios(struct tty_struct *tty,
         }
 }
 
-static void rp_break(struct tty_struct *tty, int break_state)
+static int rp_break(struct tty_struct *tty, int break_state)
 {
         struct r_port *info = (struct r_port *) tty->driver_data;
         unsigned long flags;
 
         if (rocket_paranoia_check(info, "rp_break"))
-                return;
+                return -EINVAL;
 
         spin_lock_irqsave(&info->slock, flags);
         if (break_state == -1)
@@ -1250,6 +1250,7 @@ static void rp_break(struct tty_struct *tty, int break_state)
         else
                 sClrBreak(&info->channel);
         spin_unlock_irqrestore(&info->slock, flags);
+        return 0;
 }
 
 /*