n_tty: Queue buffer work on any available cpu

Scheduling buffer work on the same cpu as the read() thread
limits the parallelism now possible between the receive_buf path
and the n_tty_read() path.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 59eb444fe17c7d95a3cb64c8fc8c839c706aab42..a69470e02bf4c44faae3021992641865cdd0c02b 100644 (file)
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -198,7 +198,7 @@ static void n_tty_set_room(struct tty_struct *tty)
                 */
                WARN_RATELIMIT(test_bit(TTY_LDISC_HALTED, &tty->flags),
                               "scheduling buffer work for halted ldisc\n");
-               schedule_work(&tty->port->buf.work);
+               queue_work(system_unbound_wq, &tty->port->buf.work);
        }
 }