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/pl2303.c b/drivers/usb/serial/pl2303.c
index 767000c70149..a3e5a56dc066 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -1042,7 +1042,6 @@ static void pl2303_push_data(struct tty_struct *tty,
                 tty_flag = TTY_FRAME;
         dbg("%s - tty_flag = %d", __func__, tty_flag);
 
-        tty_buffer_request_room(tty, urb->actual_length + 1);
         /* overrun is special, not associated with a char */
         if (line_status & UART_OVERRUN_ERROR)
                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);