linux-kernel - Common .suspend()/.resume() template for PCI devices (was: Re: [PATCH 1/3] Misc: phantom, synchronize

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Date:	Tue, 16 Oct 2007 14:09:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Len Brown <lenb@...nel.org>, Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Common .suspend()/.resume() template for PCI devices (was: Re: [PATCH 1/3] Misc: phantom, synchronize_irq() on suspend)

On Tuesday, 16 October 2007 01:23, Andrew Morton wrote:
> On Mon, 15 Oct 2007 09:32:28 -0700
> Jiri Slaby <jirislaby@...il.com> wrote:
> 
> > phantom, synchronize_irq() on suspend
> > 
> > Wait after disabling device's interrupt until the handler finishes its
> > work if still in progress.
> > 
> > Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> > 
> > ---
> > commit 7e792ef384190b517f2fb27cd0237fa30dbe0775
> > tree 17b15e5ab7c90eef0e7ae57e532839e81b831d58
> > parent 5c008a5651ee92ebe020dd5108a66a7db74fe41d
> > author Jiri Slaby <jirislaby@...il.com> Mon, 15 Oct 2007 15:52:21 +0200
> > committer Jiri Slaby <jirislaby@...il.com> Mon, 15 Oct 2007 15:52:21 +0200
> > 
> >  drivers/misc/phantom.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c
> > index 5108b7c..6e61a79 100644
> > --- a/drivers/misc/phantom.c
> > +++ b/drivers/misc/phantom.c
> > @@ -378,6 +378,8 @@ static int phantom_suspend(struct pci_dev *pdev, pm_message_t state)
> >  	iowrite32(0, dev->caddr + PHN_IRQCTL);
> >  	ioread32(dev->caddr + PHN_IRQCTL); /* PCI posting */
> >  
> > +	synchronize_irq(pdev->irq);
> > +
> >  	return 0;
> >  }
> >  
> 
> What inspired this change?  Some bug report, or does it just seem the right
> thing to do?

Probably this thread: http://lkml.org/lkml/2007/10/10/261

> Would it be logical to do this operation from the PCI core somewhere, on
> behalf of all PCI drivers?

Yes, it would.

The problem is that we don't have a common template for PCI devices' .suspend()
and .resume() callbacks and I don't feel confident enough to propose one.
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