linux-kernel - Re: [GIT PULL] PM updates for 2.6.33

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Date:	Mon, 7 Dec 2009 13:41:50 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Stern <stern@...land.harvard.edu>
cc:	Zhang Rui <rui.zhang@...el.com>, "Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [GIT PULL] PM updates for 2.6.33

On Mon, 7 Dec 2009, Alan Stern wrote:
> 
> It only seems that way because you didn't take into account devices 
> that suspend synchronously but whose children suspend asynchronously.

But why would I care? If somebody suspends synchronously, then that's what 
he wants.

> A synchronous suspend routine for a device with async child suspends
> would have to look just like your usb_node_suspend():

Sure. But that sounds like a "Doctor, it hurts when I do this" situation. 
Don't do that.

Make the USB host controller do its suspend asynchronously. We don't 
suspend PCI bridges anyway, iirc (but I didn't actually check). And at 
worst, we can make the PCI _bridges_ know about async suspends, and solve 
it that way - without actually making any normal PCI drivers do it.

		Linus
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