linux-kernel - Re: [RFC][PATCH 3/3] PM: New suspend and hibernation callbacks for PCI bus type

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Message-Id: <200803191424.49443.rjw@sisk.pl>
Date:	Wed, 19 Mar 2008 14:24:48 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Greg KH <greg@...ah.com>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	David Brownell <david-b@...bell.net>,
	Pavel Machek <pavel@....cz>
Subject: Re: [RFC][PATCH 3/3] PM: New suspend and hibernation callbacks for PCI bus type

On Wednesday, 19 of March 2008, Greg KH wrote:
> On Mon, Mar 17, 2008 at 12:25:15AM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > Implement new suspend and hibernation callbacks for the PCI busi type.
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > ---
> >  drivers/pci/pci-driver.c |  497 ++++++++++++++++++++++++++++++++++++++++++-----
> >  include/linux/pci.h      |    2 
> >  2 files changed, 453 insertions(+), 46 deletions(-)
> 
> Hm, that's a lot of code added.  What additional functionality did we
> just get?

The possibility to handle suspend/hibernation in a more flexible way, provided
that the drivers define the new callbacks.

> Are we going to have to create a noirq version for every driver and bus
> type now?

No, we aren't.  The PCI and platform bus types already have the noirq callbacks
implemented (they are called _late and _early, but that's the same
essentially).

Thanks,
Rafael
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