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/generic.c b/drivers/usb/serial/generic.c
index 9d57cace3731..4cec9906ccf3 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -122,12 +122,6 @@ int usb_serial_generic_open(struct tty_struct *tty,
 
         dbg("%s - port %d", __func__, port->number);
 
-        /* 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;
-
         /* clear the throttle flags */
         spin_lock_irqsave(&port->lock, flags);
         port->throttled = 0;