linux-kernel - Re: [PATCH 2/8] PM: Asynchronous suspend and resume of devices

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Date:	Sun, 24 Jan 2010 22:12:29 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	<linux-usb@...r.kernel.org>, Greg KH <gregkh@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Nigel Cunningham <ncunningham@...a.org.au>
Subject: Re: [PATCH 2/8] PM: Asynchronous suspend and resume of devices

On Mon, 25 Jan 2010, Rafael J. Wysocki wrote:

> > I intend to write this code, but merging it will be a little tricky.  
> > You'll have to coordinate with Greg KH.
> 
> OK, I don't think that's a big deal.  I can defer patch 7/8 until that code has
> been merged.

You may have to delay 6/8 as well, since the controllers are PCI
devices.  Writing the new code shouldn't take too long, though.

Is there a good way to iterate through all PCI devices in a particular
slot, or should it be done by going through all PCI devices and
ignoring those in other slots?  Calling pci_get_slot() multiple times
doesn't look very efficient.

> I'll try that, but my mkinitrd automatically puts the USB drivers into
> initramfs.  I guess I'll need to do some research to really verify it. :-)

Then when you install the test kernel, mkinitrd should build a
corresponding initramfs image with the modified drivers, right?  
Otherwise there would be a version mismatch error when the init code
tried to load the old drivers into the new kernel.

If nothing else works, you can simply unload the standard uhci-hcd,
ohci-hcd, and ehci-hcd drivers and then modprobe the modified versions
before starting the hibernation.

Alan Stern

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