Commit dbfd2866 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: pl2303: only wake up MSR queue on changes 



Only wake up MSR wait queue on actual modem-status changes.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6020c3be

drivers/usb/serial/pl2303.c

+10 −7
Original line number Diff line number Diff line
@@ -118,6 +118,7 @@ MODULE_DEVICE_TABLE(usb, id_table); 
#define VENDOR_READ_REQUEST		0x01



#define UART_STATE_INDEX		8

#define UART_STATE_MSR_MASK		0x8b

#define UART_STATE_TRANSIENT_MASK	0x74

#define UART_DCD			0x01

#define UART_DSR			0x02
@@ -828,8 +829,7 @@ static void pl2303_update_line_status(struct usb_serial_port *port, 
	if (status & UART_BREAK_ERROR)

		usb_serial_handle_break(port);



	wake_up_interruptible(&port->port.delta_msr_wait);



	if (delta & UART_STATE_MSR_MASK) {

		if (delta & UART_DCD) {

			tty = tty_port_tty_get(&port->port);

			if (tty) {
@@ -838,6 +838,9 @@ static void pl2303_update_line_status(struct usb_serial_port *port, 
				tty_kref_put(tty);

			}

		}



		wake_up_interruptible(&port->port.delta_msr_wait);

	}

}



static void pl2303_read_int_callback(struct urb *urb)