USB: removal of tty->low_latency hack dating back to the old serial code

This removes tty->low_latency from all USB serial drivers that push
data into the tty layer at hard interrupt context. It's no longer needed
and actually harmful.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 6 deletions

diff --git a/drivers/usb/serial/empeg.c b/drivers/usb/serial/empeg.c
index 8a69cce40b6d..c709ec474a80 100644
--- a/drivers/usb/serial/empeg.c
+++ b/drivers/usb/serial/empeg.c
@@ -478,12 +478,6 @@ static void empeg_set_termios(struct tty_struct *tty,
         termios->c_cflag
                 |= CS8;         /* character size 8 bits */
 
-        /*
-         * Force low_latency on; otherwise the pushes are scheduled;
-         * this is bad as it opens up the possibility of dropping bytes
-         * on the floor.  We don't want to drop bytes on the floor. :)
-         */
-        tty->low_latency = 1;
         tty_encode_baud_rate(tty, 115200, 115200);
 }