linux-kernel - Re: [PATCH] x86/PCI: Don't alloc pcibios-irq when MSI is enabled

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Message-ID: <20151023082314.GW27420@8bytes.org>
Date:	Fri, 23 Oct 2015 10:23:15 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Bjorn Helgaas <helgaas@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH] x86/PCI: Don't alloc pcibios-irq when MSI is enabled

On Fri, Oct 23, 2015 at 10:02:11AM +0800, Jiang Liu wrote:
> 	There's another patch already merged into mainstream kernel,
> which solves this issue in another way by making use of
> pci_dev->match_driver flag. Please refer to:
> cbbc00be2ce3 ("iommu/amd: Prevent binding other PCI drivers to IOMMU PCI
> devices")
> 	So I think this patch is redundant now.

Yeah, it fixes the same problem already fixed by your match_driver fix.
But I think this fix makes still sense as it avoids that the problem can
reappear in the future with other drivers. Setting pci_dev->match_driver
could be easily forgotten when writing new code.


	Joerg

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