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Commit 6020c3be authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: pl2303: clean up line-status handling 



Clean up line-status handling somewhat.
Get tty-reference only when actually needed.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b6934681

drivers/usb/serial/pl2303.c

+15 −11
Original line number Diff line number Diff line
@@ -808,7 +808,8 @@ static void pl2303_update_line_status(struct usb_serial_port *port, 
	struct tty_struct *tty;

	unsigned long flags;

	unsigned int status_idx = UART_STATE_INDEX;

	u8 prev_line_status;

	u8 status;

	u8 delta;



	if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)

		status_idx = 0;
@@ -816,25 +817,28 @@ static void pl2303_update_line_status(struct usb_serial_port *port, 
	if (actual_length < status_idx + 1)

		return;



	status = data[status_idx];



	/* Save off the uart status for others to look at */

	spin_lock_irqsave(&priv->lock, flags);

	prev_line_status = priv->line_status;

	priv->line_status = data[status_idx];

	delta = priv->line_status ^ status;

	priv->line_status = status;

	spin_unlock_irqrestore(&priv->lock, flags);



	if (priv->line_status & UART_BREAK_ERROR)

	if (status & UART_BREAK_ERROR)

		usb_serial_handle_break(port);



	wake_up_interruptible(&port->port.delta_msr_wait);



	if (delta & UART_DCD) {

		tty = tty_port_tty_get(&port->port);

	if (!tty)

		return;

	if ((priv->line_status ^ prev_line_status) & UART_DCD)

		if (tty) {

			usb_serial_handle_dcd_change(port, tty,

				priv->line_status & UART_DCD);

							status & UART_DCD);

			tty_kref_put(tty);

		}

	}

}



static void pl2303_read_int_callback(struct urb *urb)

{