linux-kernel - Re: [PATCH] x86 PCI: Do not use interrupt links for devices using MSI-X

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Date:	Mon, 5 Jan 2009 14:04:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86 PCI: Do not use interrupt links for devices using
	MSI-X


* Rafael J. Wysocki <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> pcibios_enable_device() and pcibios_disable_device() don't handle
> IRQs for devices that have MSI enabled and it should tread the

s/tread/treat

> devices with MSI-X enabled in the same way.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  arch/x86/pci/common.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

looks good - Jesse, what do you think?

Rafael, i'm curious is this in response to some regression/bug? Did some 
box or driver get confused by us enabling/disabling the GSI? Some IRQ 
flood perhaps?

btw., there's a small observation:

> +     if (!dev->msi_enabled && !dev->msix_enabled)

maybe a "pci_has_gsi_irq()" wrapper would make these checks cleaner and 
would make things more robust, should there be any new IRQ delivery method 
be introduced in the future?

	Ingo
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