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>
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 7732866..f37476e 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -55,7 +55,6 @@
int status = urb->status;
struct tty_struct *tty;
int result;
- int available_room = 0;
int data_length;
dbg("%s - port %d", __func__, port->number);
@@ -96,13 +95,9 @@
/* real data, send it to the tty layer */
tty = tty_port_tty_get(&port->port);
if (tty) {
- available_room = tty_buffer_request_room(tty,
- data_length);
- if (available_room) {
- tty_insert_flip_string(tty, data,
- available_room);
- tty_flip_buffer_push(tty);
- }
+ tty_insert_flip_string(tty, data,
+ data_length);
+ tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
} else {