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USB: oti6858: only wake up MSR queue on changes

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

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 22:49:34 +01:00 committed by Greg Kroah-Hartman
parent 271ec2d2d7
commit 1acc36e9c8
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/serial/oti6858.c
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@ -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);
}