USB: tty: Prune uses of tty_request_room in the USB layer

We have lots of callers that do not need to do this in the first place.
Remove the calls as they both cost CPU and for big buffers can mess up the
multi-page allocation avoidance.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 1 deletions

diff --git a/drivers/usb/serial/navman.c b/drivers/usb/serial/navman.c
index efa61bcd3297..04a6cbbed2c0 100644
--- a/drivers/usb/serial/navman.c
+++ b/drivers/usb/serial/navman.c
@@ -66,7 +66,6 @@ static void navman_read_int_callback(struct urb *urb)
 
         tty = tty_port_tty_get(&port->port);
         if (tty && urb->actual_length) {
-                tty_buffer_request_room(tty, urb->actual_length);
                 tty_insert_flip_string(tty, data, urb->actual_length);
                 tty_flip_buffer_push(tty);
         }