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/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 6286baad9392..c148544953b3 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -231,13 +231,7 @@ static int kobil_open(struct tty_struct *tty,
         /* someone sets the dev to 0 if the close method has been called */
         port->interrupt_in_urb->dev = port->serial->dev;
 
-
-        /* force low_latency on so that our tty_push actually forces
-         * the data through, otherwise it is scheduled, and with high
-         * data rates (like with OHCI) data can get lost.
-         */
         if (tty) {
-                tty->low_latency = 1;
 
                 /* Default to echo off and other sane device settings */
                 tty->termios->c_lflag = 0;