diff options
| -rw-r--r-- | drivers/tty/ipwireless/tty.c | 3 | ||||
| -rw-r--r-- | drivers/tty/tty_buffer.c | 20 | ||||
| -rw-r--r-- | drivers/usb/gadget/u_serial.c | 4 | ||||
| -rw-r--r-- | include/linux/tty.h | 2 |
4 files changed, 7 insertions, 22 deletions
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c index ebd5bff0f5c1..17ee3bf0926b 100644 --- a/drivers/tty/ipwireless/tty.c +++ b/drivers/tty/ipwireless/tty.c @@ -176,9 +176,6 @@ void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data, ": %d chars not inserted to flip buffer!\n", length - work); - /* - * This may sleep if ->low_latency is set - */ if (work) tty_flip_buffer_push(&tty->port); } diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 765125dff20e..8ebd9f88a6f6 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -351,14 +351,11 @@ EXPORT_SYMBOL(tty_insert_flip_string_flags); * Takes any pending buffers and transfers their ownership to the * ldisc side of the queue. It then schedules those characters for * processing by the line discipline. - * Note that this function can only be used when the low_latency flag - * is unset. Otherwise the workqueue won't be flushed. */ void tty_schedule_flip(struct tty_port *port) { struct tty_bufhead *buf = &port->buf; - WARN_ON(port->low_latency); buf->tail->commit = buf->tail->used; schedule_work(&buf->work); @@ -482,17 +479,15 @@ static void flush_to_ldisc(struct work_struct *work) */ void tty_flush_to_ldisc(struct tty_struct *tty) { - if (!tty->port->low_latency) - flush_work(&tty->port->buf.work); + flush_work(&tty->port->buf.work); } /** * tty_flip_buffer_push - terminal * @port: tty port to push * - * Queue a push of the terminal flip buffers to the line discipline. This - * function must not be called from IRQ context if port->low_latency is - * set. + * Queue a push of the terminal flip buffers to the line discipline. + * Can be called from IRQ/atomic context. * * In the event of the queue being busy for flipping the work will be * held off and retried later. @@ -500,14 +495,7 @@ void tty_flush_to_ldisc(struct tty_struct *tty) void tty_flip_buffer_push(struct tty_port *port) { - struct tty_bufhead *buf = &port->buf; - - buf->tail->commit = buf->tail->used; - - if (port->low_latency) - flush_to_ldisc(&buf->work); - else - schedule_work(&buf->work); + tty_schedule_flip(port); } EXPORT_SYMBOL(tty_flip_buffer_push); diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c index b369292d4b90..ad0aca812002 100644 --- a/drivers/usb/gadget/u_serial.c +++ b/drivers/usb/gadget/u_serial.c @@ -549,8 +549,8 @@ static void gs_rx_push(unsigned long _port) port->read_started--; } - /* Push from tty to ldisc; without low_latency set this is handled by - * a workqueue, so we won't get callbacks and can hold port_lock + /* Push from tty to ldisc; this is handled by a workqueue, + * so we won't get callbacks and can hold port_lock */ if (do_push) tty_flip_buffer_push(&port->port); diff --git a/include/linux/tty.h b/include/linux/tty.h index 90b4fdc8a61f..b90b5c221ff0 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -208,7 +208,7 @@ struct tty_port { wait_queue_head_t delta_msr_wait; /* Modem status change */ unsigned long flags; /* TTY flags ASY_*/ unsigned char console:1, /* port is a console */ - low_latency:1; /* direct buffer flush */ + low_latency:1; /* optional: tune for latency */ struct mutex mutex; /* Locking */ struct mutex buf_mutex; /* Buffer alloc lock */ unsigned char *xmit_buf; /* Optional buffer */ |