linux-kernel - Re: Changes to sysfs PM layer break userspace

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Message-Id: <1166556889.3365.1269.camel@laptopd505.fenrus.org>
Date:	Tue, 19 Dec 2006 20:34:48 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-kernel@...r.kernel.org, david-b@...bell.net, gregkh@...e.de
Subject: Re: Changes to sysfs PM layer break userspace

On Tue, 2006-12-19 at 18:52 +0000, Matthew Garrett wrote:
> Commit 047bda36150d11422b2c7bacca1df324c909c0b3 broke userspace. 
> Previously, /sys/bus/pci/devices/foo/power/state could have values 
> echoed into it for triggering suspend/resume calls in the driver. The 
> breakage is handily mentioned in the comment:
> 
> "Devices with bus.suspend_late(), or bus.resume_early() methods fail 
> this operation; those methods couldn't be called."
> 
> but there's no mention of what previously working code is supposed to do 
> now. That's the second time in the past year or so that this interface 
> has been broken - can we have it working again, please, especially as 
> there doesn't appear to be an alternative yet?


which userspace is using this btw?


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