diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-04-18 17:33:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-19 10:24:13 -0700 |
| commit | 2c992cd73772bd0ef107536e8e3399d28493caa8 (patch) | |
| tree | f596c0810ab88d2c468140931e806bca40c3f067 | |
| parent | b5784f7d8528926d69c5868f1ddb2af99f85e799 (diff) | |
USB: ti_usb_3410_5052: 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>
| -rw-r--r-- | drivers/usb/serial/ti_usb_3410_5052.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c index 3ed8ecafe597..062b6d872ea3 100644 --- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -687,6 +687,8 @@ static int ti_chars_in_buffer(struct tty_struct *tty) struct ti_port *tport = usb_get_serial_port_data(port); int chars = 0; unsigned long flags; + int ret; + u8 lsr; if (tport == NULL) return 0; @@ -695,6 +697,12 @@ static int ti_chars_in_buffer(struct tty_struct *tty) chars = kfifo_len(&tport->write_fifo); spin_unlock_irqrestore(&tport->tp_lock, flags); + if (!chars) { + ret = ti_get_lsr(tport, &lsr); + if (!ret && !(lsr & TI_LSR_TX_EMPTY)) + chars = 1; + } + dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); return chars; } |