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| author | Johan Hovold <jhovold@gmail.com> | 2013-05-05 20:32:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-17 02:32:21 +0200 |
| commit | 0693196fe7bbb5e6cafd255dfce91ff6d10bc18f (patch) | |
| tree | 9cc67b83f7757647adea0629a3adf94c05865354 /drivers/usb/serial/usb-serial.c | |
| parent | USB: set device dma_mask without reference to global data (diff) | |
| download | linux-0693196fe7bbb5e6cafd255dfce91ff6d10bc18f.tar.xz linux-0693196fe7bbb5e6cafd255dfce91ff6d10bc18f.zip | |
USB: serial: add wait_until_sent operation
Add wait_until_sent operation which can be used to wait for hardware
buffers to drain.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial/usb-serial.c')
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index cf75beb1251b..31d27686151f 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -375,6 +375,22 @@ static int serial_chars_in_buffer(struct tty_struct *tty) return count; } +static void serial_wait_until_sent(struct tty_struct *tty, int timeout) +{ + struct usb_serial_port *port = tty->driver_data; + struct usb_serial *serial = port->serial; + + dev_dbg(tty->dev, "%s\n", __func__); + + if (!port->serial->type->wait_until_sent) + return; + + mutex_lock(&serial->disc_mutex); + if (!serial->disconnected) + port->serial->type->wait_until_sent(tty, timeout); + mutex_unlock(&serial->disc_mutex); +} + static void serial_throttle(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; @@ -1191,6 +1207,7 @@ static const struct tty_operations serial_ops = { .unthrottle = serial_unthrottle, .break_ctl = serial_break, .chars_in_buffer = serial_chars_in_buffer, + .wait_until_sent = serial_wait_until_sent, .tiocmget = serial_tiocmget, .tiocmset = serial_tiocmset, .get_icount = serial_get_icount, |