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USB: cypress_m8: 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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2 changed files with 5 additions and 1 deletions
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@ -1187,7 +1187,10 @@ static void cypress_read_int_callback(struct urb *urb)
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if (priv->current_status != priv->prev_status) {
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priv->diff_status |= priv->current_status ^
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priv->prev_status;
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wake_up_interruptible(&port->port.delta_msr_wait);
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if (priv->diff_status & UART_MSR_MASK)
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wake_up_interruptible(&port->port.delta_msr_wait);
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priv->prev_status = priv->current_status;
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}
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spin_unlock_irqrestore(&priv->lock, flags);
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@ -66,6 +66,7 @@
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#define CONTROL_RTS 0x10 /* request to send */
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#define CONTROL_RESET 0x08 /* sent with output report */
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#define UART_MSR_MASK 0xf0
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#define UART_RI 0x80 /* ring indicator */
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#define UART_CD 0x40 /* carrier detect */
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#define UART_DSR 0x20 /* data set ready */
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