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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: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -103,6 +103,7 @@ struct oti6858_control_pkt {
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#define TX_BUFFER_EMPTIED 0x09
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u8 pin_state;
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#define PIN_MASK 0x3f
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#define PIN_MSR_MASK 0x1b
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#define PIN_RTS 0x20 /* output pin */
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#define PIN_CTS 0x10 /* input pin, active low */
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#define PIN_DSR 0x08 /* input pin, active low */
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@ -739,8 +740,11 @@ static void oti6858_read_int_callback(struct urb *urb)
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}
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if (!priv->transient) {
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if (xs->pin_state != priv->status.pin_state)
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u8 delta = xs->pin_state ^ priv->status.pin_state;
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if (delta & PIN_MSR_MASK)
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wake_up_interruptible(&port->port.delta_msr_wait);
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memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
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}
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