linux-kernel - Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi

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Date:	Tue, 25 Sep 2012 15:59:05 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
CC:	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<joro@...tes.org>, Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 17/19] x86, msi: Introduce x86_msi.compose_msi_msg
 call-back

On Sun, Aug 26, 2012 at 08:41:40PM +0200, Sebastian Andrzej Siewior wrote:
> On Mon, Aug 20, 2012 at 03:56:03PM +0200, Joerg Roedel wrote:
> > This call-back points to the right function for initializing
> > the msi_msg structure.
> 
> So you pull out the compose_remapped_msi_msg() out of msi_compose_msg() and
> put this in a callback. Such information is good since you don't see this in
> diff and even --patience does not help here.

Added that to the commit message.

> 
> > --- a/drivers/iommu/irq_remapping.c
> > +++ b/drivers/iommu/irq_remapping.c
> > @@ -242,10 +243,12 @@ void compose_remapped_msi_msg(struct pci_dev *pdev,
> >  			      unsigned int irq, unsigned int dest,
> >  			      struct msi_msg *msg, u8 hpet_id)
> >  {
> > -	if (!remap_ops || !remap_ops->compose_msi_msg)
> > -		return;
> > +	struct irq_cfg *cfg = irq_get_chip_data(irq);
> >  
> > -	remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> > +	if (cfg && !irq_remapped(cfg))
> > +		native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> > +	else if (remap_ops && remap_ops->compose_msi_msg)
> > +		remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
> 
> cfg _has_ to be valid here and if it is not than you shouldn't assume that
> this irq is remapped.
> Also remap_ops has to be set here. And ->compose_msi_msg() should be set
> here as well. Would it make sense if it is not set?

I removed the check for cfg, but I am still conservative on calling
function pointers without checking them first.


	Joerg

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