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Commit 1acc36e9 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: oti6858: 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 271ec2d2

drivers/usb/serial/oti6858.c

+5 −1
Original line number Diff line number Diff line
@@ -103,6 +103,7 @@ struct oti6858_control_pkt { 
#define	TX_BUFFER_EMPTIED	0x09

	u8	pin_state;

#define PIN_MASK		0x3f

#define PIN_MSR_MASK		0x1b

#define PIN_RTS			0x20	/* output pin */

#define PIN_CTS			0x10	/* input pin, active low */

#define PIN_DSR			0x08	/* input pin, active low */
@@ -739,8 +740,11 @@ static void oti6858_read_int_callback(struct urb *urb) 
		}



		if (!priv->transient) {

			if (xs->pin_state != priv->status.pin_state)

			u8 delta = xs->pin_state ^ priv->status.pin_state;



			if (delta & PIN_MSR_MASK)

				wake_up_interruptible(&port->port.delta_msr_wait);



			memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);

		}