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Commit b770081f authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: ch341: clean up line-status handling 



Clean up line-status handling.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ac035628

drivers/usb/serial/ch341.c

+14 −8
Original line number Diff line number Diff line
@@ -444,25 +444,31 @@ static void ch341_update_line_status(struct usb_serial_port *port, 
					unsigned char *data, size_t len)

{

	struct ch341_private *priv = usb_get_serial_port_data(port);

	struct tty_struct *tty;

	unsigned long flags;

	u8 prev_line_status = priv->line_status;

	u8 status;

	u8 delta;



	if (len < 4)

		return;



	status = ~data[2] & CH341_BITS_MODEM_STAT;



	spin_lock_irqsave(&priv->lock, flags);

	priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT;

	if ((data[1] & CH341_MULT_STAT))

	delta = status ^ priv->line_status;

	priv->line_status = status;

	if (data[1] & CH341_MULT_STAT)

		priv->multi_status_change = 1;

	spin_unlock_irqrestore(&priv->lock, flags);



	if ((priv->line_status ^ prev_line_status) & CH341_BIT_DCD) {

		struct tty_struct *tty = tty_port_tty_get(&port->port);

		if (tty)

	if (delta & CH341_BIT_DCD) {

		tty = tty_port_tty_get(&port->port);

		if (tty) {

			usb_serial_handle_dcd_change(port, tty,

					priv->line_status & CH341_BIT_DCD);

						status & CH341_BIT_DCD);

			tty_kref_put(tty);

		}

	}



	wake_up_interruptible(&port->port.delta_msr_wait);

}