serdev: ttyport: do not used keyed wakeup in write_wakeup

Serdev does not use the file abstraction and specifically there will
never be anyone polling a file descriptor for POLLOUT events.

Just use plain wake_up_interruptible() in the write_wakeup callback and
document why it's there.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index c2629ab1bbcf7f832223b22d6b0b3f93a2b12db4..a5abb05be67d0273f49d0ede83dde3c329ad8db4 100644 (file)
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -59,7 +59,8 @@ static void ttyport_write_wakeup(struct tty_port *port)
            test_bit(SERPORT_ACTIVE, &serport->flags))
                serdev_controller_write_wakeup(ctrl);
 
-       wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+       /* Wake up any tty_wait_until_sent() */
+       wake_up_interruptible(&tty->write_wait);
 
        tty_kref_put(tty);
 }