linux-kernel - Re: [PATCH 03/15] tty: serial: 8250

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Date:	Wed, 20 Aug 2014 11:23:21 +0200
From:	Frans Klaver <frans.klaver@...ns.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	<linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <tony@...mide.com>,
	<balbi@...com>, Vinod Koul <vinod.koul@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH 03/15] tty: serial: 8250_core: add run time pm

Hi,

On Fri, Aug 15, 2014 at 07:42:31PM +0200, Sebastian Andrzej Siewior wrote:
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -1899,12 +1984,22 @@ static void wait_for_xmitr(struct uart_8250_port *up, int bits)
>  
>  static int serial8250_get_poll_char(struct uart_port *port)
>  {
> -	unsigned char lsr = serial_port_in(port, UART_LSR);
> +	unsigned char lsr;
> +	int status;
> +
> +	serial8250_rpm_get(up);

or up won't be defined below. You probably need 
+	struct uart_8250_port *up = up_to_u8250p(port);
somewhere in there.

> -	if (!(lsr & UART_LSR_DR))
> -		return NO_POLL_CHAR;
> +	lsr = serial_port_in(port, UART_LSR);
>  
> -	return serial_port_in(port, UART_RX);
> +	if (!(lsr & UART_LSR_DR)) {
> +		status = NO_POLL_CHAR;
> +		goto out;
> +	}
> +
> +	status = serial_port_in(port, UART_RX);
> +out:
> +	serial8250_rpm_put(up);
> +	return status;
>  }

Cheers,
Frans
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