linux-kernel - Re: uio: power management of user-space drivers

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Date:	Tue, 15 Feb 2011 17:17:54 -0800
From:	Greg KH <gregkh@...e.de>
To:	"Hans J. Koch" <hjk@...sjkoch.de>
Cc:	"Benenati, Chris J" <chris.j.benenati@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: uio: power management of user-space drivers

On Wed, Feb 16, 2011 at 01:21:04AM +0100, Hans J. Koch wrote:
> Let me guess: suspend/resume functions are supposed to leave your hardware in
> a consistent state and you don't know the state if the suspend() catches you
> in the middle of your userspace processing?
> I remember the Android guys had problems like that and invented some
> "suspend blockers". However, I don't remember what the final answer in that
> discussion was. Greg?

It's all in the kernel today.  See:
	http://lwn.net/Articles/416690/
for all of the details you will ever need.

Hope this helps,

greg k-h
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