linux-kernel - Re: [patch] suspend/resume debugging: device filter

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Message-ID: <20070126093643.GA4627@ucw.cz>
Date:	Fri, 26 Jan 2007 09:36:43 +0000
From:	Pavel Machek <pavel@....cz>
To:	Greg KH <gregkh@...e.de>
Cc:	Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	linux-pm@...ts.osdl.org
Subject: Re: [patch] suspend/resume debugging: device filter

Hi!

> > it might be better to do this centrally in sysfs, via a per-device 
> > attribute, to individually enable suspend and resume on a per device 
> > basis, but my sysfs-fu is not strong enough for that now ;-)
> 
> Here's a (compile tested only) patch that does this on a per-device
> basis, which is smaller, and should work just as well as your patch.
> 
> It creates a new file in the power/ directory for every device called
> "can_suspend".  Write a '0' to it to prevent that device from being
> suspended.

Maybe we could just introduce debug_flags?

> +static ssize_t can_suspend_store(struct device *dev,
> +				 struct device_attribute *attr,
> +				 const char *buf, size_t n)
> +{
> +	if (!n)
> +		return -EINVAL;
> +
> +	switch (buf[0]) {
> +	case 'y':
> +	case 'Y':
> +	case '1':
> +		dev->no_suspend = 0;
> +		break;
> +	case 'n':
> +	case 'N':
> +	case '0':
> +		dev->no_suspend = 1;
> +		break;

default: return -EINVAL ?

							Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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