[PATCH] agp/amd64: Bind to unsupported devices only if AGP is present

[Ben Hutchings]

On Sat, 2025-06-21 at 11:40 +0200, Lukas Wunner wrote:
> Since commit 172efbb40333 ("AGP: Try unsupported AGP chipsets on x86-64 by
> default"), the AGP driver for AMD Opteron/Athlon64 CPUs attempts to bind
> to any PCI device.
> 
> On modern CPUs exposing an AMD IOMMU, this results in a message with
> KERN_CRIT severity:
> 
>   pci 0000:00:00.2: Resources present before probing
> 
> The driver used to bind only to devices exposing the AGP Capability, but
> that restriction was removed by commit 6fd024893911 ("amd64-agp: Probe
> unknown AGP devices the right way").
[...]

That didn't remove any restriction as the probe function still started
by checking for an AGP capability.  The change I made was that the
driver would actually bind to devices with the AGP capability instead of
starting to use them without binding.

Ben.

-- 
Ben Hutchings
All the simple programs have been written, and all the good names taken
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