diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-01-14 16:52:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-18 15:45:17 -0800 |
| commit | 263e1f9fbb999fb78df5bfed87ddbba1c12ee0f1 (patch) | |
| tree | 07eccb56a78f378488625a69c7957b75e01e2f79 /drivers/usb/serial | |
| parent | 810360a03597afc0d43a45798a52cfb69b8453d3 (diff) | |
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 <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/io_ti.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index 3abbdaad838d..590f27d3bfc1 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; } |