linux-kernel - Re: [rfc patch] Re: [patch] PM: suspend/resume debugging should depend on SOFTWARE

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Date:	Wed, 29 Nov 2006 11:49:34 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Mike Galbraith <efault@....de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...l.org>,
	Pavel Machek <pavel@...e.cz>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [rfc patch] Re: [patch] PM: suspend/resume debugging should
 depend on SOFTWARE_SUSPEND

On Wed, 29 Nov 2006 11:30:31 +0100
Mike Galbraith <efault@....de> wrote:

> On Wed, 2006-11-29 at 11:21 +0100, Mike Galbraith wrote:
> > > The serial console appears to be innocent.  The suspend/resume methods
> > > for my 16550A serial port aren't even being _called_, apparently because
> > > pnp swiped ttyS0.
> 
> (ahem, bad aim with mouse, resuming)
> 
> Well, after further rummaging, the suspend/resume methods aren't being
> called because we're using 8250_pnp.c when CONFIG_PNP is set, and it
> doesn't have any :)  The below works for me, though I'm not sure it's
> sufficient.  If it is deemed sufficient, I'll submit it to Andrew.
> 
> Add suspend/resume methods to 8250_pnp driver.
> 
> --- linux-2.6.19-rc6-mm2/drivers/serial/8250_pnp.c.org	2006-11-29 07:14:15.000000000 +0100
> +++ linux-2.6.19-rc6-mm2/drivers/serial/8250_pnp.c	2006-11-29 10:55:17.000000000 +0100
> @@ -464,11 +464,38 @@ static void __devexit serial_pnp_remove(
>  		serial8250_unregister_port(line - 1);
>  }
>  
> +#ifdef CONFIG_PM
> +static int serial_pnp_suspend(struct pnp_dev *dev, pm_message_t state)
> +{
> +	long line = (long)pnp_get_drvdata(dev);

Please avoid adding long lines.  (heh, I kill me)

> +	if (!line)
> +		return -ENODEV;
> +	serial8250_suspend_port(line - 1);
> +	return 0;
> +}
> +
> +static int serial_pnp_resume(struct pnp_dev *dev)
> +{
> +	long line = (long)pnp_get_drvdata(dev);
> +
> +	if (!line)
> +		return -ENODEV;
> +	serial8250_resume_port(line - 1);
> +	return 0;
> +}

We'd usually do

#else
#define serial_pnp_suspend NULL
#define serial_pnp_resume NULL

here

> +
> +#endif /* CONFIG_PM */
> +
>  static struct pnp_driver serial_pnp_driver = {
>  	.name		= "serial",
> -	.id_table	= pnp_dev_table,
>  	.probe		= serial_pnp_probe,
>  	.remove		= __devexit_p(serial_pnp_remove),
> +#ifdef CONFIG_PM
> +	.suspend	= serial_pnp_suspend,
> +	.resume		= serial_pnp_resume,
> +#endif

and hence omit the ifdefs here.
-
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