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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: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-01-02 22:49:21 +01:00 committed by Greg Kroah-Hartman
parent b693468155
commit 6020c3bec3
1 changed files with 15 additions and 11 deletions
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26
drivers/usb/serial/pl2303.c
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@ -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;
@ -816,24 +817,27 @@ 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);
tty = tty_port_tty_get(&port->port);
if (!tty)
return;
if ((priv->line_status ^ prev_line_status) & UART_DCD)
usb_serial_handle_dcd_change(port, tty,
priv->line_status & UART_DCD);
tty_kref_put(tty);
if (delta & UART_DCD) {
tty = tty_port_tty_get(&port->port);
if (tty) {
usb_serial_handle_dcd_change(port, tty,
status & UART_DCD);
tty_kref_put(tty);
}
}
}
static void pl2303_read_int_callback(struct urb *urb)