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USB: serial: ftdi_sio: fix TIOCGSERIAL implementation 

TIOCSSERIAL is a horrid, underspecified, legacy interface which for most
serial devices is only useful for setting the close_delay and
closing_wait parameters.

The FTDI driver is the only USB serial driver supporting the deprecated
ASYNC_SPD flags, which are reported back as they should by TIOCGSERIAL,
but the returned parameters did not include the line number.

The close_delay and closing_wait parameters returned by TIOCGSERIAL are
specified in centiseconds. The driver does not yet support changing
these, but let's report back the default values actually used (0.5 and
30 seconds, respectively).

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2021-04-07 12:39:05 +02:00
parent 5c1426df9b
commit 2ab5836101
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/serial/ftdi_sio.c
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@ -1483,9 +1483,13 @@ static int get_serial_info(struct tty_struct *tty,
struct usb_serial_port *port = tty->driver_data; struct usb_serial_port *port = tty->driver_data;
struct ftdi_private *priv = usb_get_serial_port_data(port); struct ftdi_private *priv = usb_get_serial_port_data(port);
ss->line = port->minor;
ss->flags = priv->flags; ss->flags = priv->flags;
ss->baud_base = priv->baud_base; ss->baud_base = priv->baud_base;
ss->custom_divisor = priv->custom_divisor; ss->custom_divisor = priv->custom_divisor;
ss->close_delay = 50;
ss->closing_wait = 3000;
return 0; return 0;
} }