From 263e1f9fbb999fb78df5bfed87ddbba1c12ee0f1 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 14 Jan 2013 16:52:57 +0100 Subject: [PATCH] USB: io_ti: query hardware-buffer status in chars_in_buffer Query hardware-buffer status in chars_in_buffer should the write fifo be empty. This is needed to make the tty layer wait for hardware buffers to drain on close. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/io_ti.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index 3abbdaa..590f27d 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -2088,6 +2088,7 @@ static int edge_chars_in_buffer(struct tty_struct *tty) struct edgeport_port *edge_port = usb_get_serial_port_data(port); int chars = 0; unsigned long flags; + int ret; if (edge_port == NULL) return 0; @@ -2098,6 +2099,12 @@ static int edge_chars_in_buffer(struct tty_struct *tty) chars = kfifo_len(&edge_port->write_fifo); spin_unlock_irqrestore(&edge_port->ep_lock, flags); + if (!chars) { + ret = tx_active(edge_port); + if (ret > 0) + chars = ret; + } + dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); return chars; } -- 2.7.4