linux-kernel - Re: [PATCH] x86, pci: Fix all early PCI scans to check the vendor ID first

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Message-ID: <50259FCE.4070205@zytor.com>
Date:	Fri, 10 Aug 2012 16:57:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Betty Dall <betty.dall@...com>
CC:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86, pci: Fix all early PCI scans to check the vendor
 ID first

On 08/09/2012 03:34 PM, Betty Dall wrote:
> 
> I thought this should be a break instead of a continue since the code
> does a break if the class is 0xffffffff. If the function does not have a
> valid VENDOR_ID, then the remaining function numbers do not have to be
> scanned because functions are required to be implemented in order (no
> skipping a function number.)
> 

Is that true?  This is certainly not true in PCI in general: there is
required to be a function 0, but there is no guarantee that functions
1-7 don't have gaps.

	-hpa

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