Re: [PATCH 2/4] PCI/sysfs: Decouple acpi_index from the optional device name element

[sashiko-bot@kernel.org]

> Currently, dsm_get_label() validates both elements of the Device Name
> _DSM result in a single conditional.  The _DSM returns an ACPI package
> of two elements, the instance number and the device name, where the
> instance number is mandatory and the name is optional.  Firmware that
> implements no name must return a NULL string for it.
> 
> Reads of "acpi_index" therefore fail whenever the name element is
> malformed.  That attribute exports only the instance number, and the
> two elements do not depend on each other.
> 
> Thus, validate each element only for the attribute that exports it.
> So "acpi_index" now depends on the instance number alone, and "label"
> reads fail with -EIO when the name element is neither a string nor a
> buffer.  The package elements pointer is read only after the object
> type has been checked.
> 
> On platforms with a valid instance number and a malformed name element
> the "acpi_index" attribute starts returning data.  Because udev derives
> the onboard interface name from "acpi_index", an interface on such a
> platform may be renamed once, on the first boot after this change.
> That is the attribute assuming the value the firmware always
> provided.
> 
> Link: https://github.com/pciutils/pciutils/issues/175
> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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