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/mos7840.c b/drivers/usb/serial/mos7840.c
index 499b7b82a0ec..84fb1dcd30dc 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1007,12 +1007,6 @@ static int mos7840_open(struct tty_struct *tty,
         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
                                                                         Data);
 
-        /* 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;
-
         /* Check to see if we've set up our endpoint info yet    *
          * (can't set it up in mos7840_startup as the structures *
          * were not set up at that time.)                        */