Re: [PATCH v1 00/16] ACPI: Get rid of the list of children in struct acpi_device

[Andy Shevchenko]

On Thu, Jun 09, 2022 at 03:44:27PM +0200, Rafael J. Wysocki wrote:
> Hi All,
> 
> Confusingly enough, the ACPI subsystem stores the information on the given ACPI
> device's children in two places: as the list of children in struct acpi_device
> and (as a result of device registration) in the list of children in the embedded
> struct device.
> 
> These two lists agree with each other most of the time, but not always (like in
> error paths in some cases), and the list of children in struct acpi_device is
> not generally safe to use without locking.  In principle, it should always be
> walked under acpi_device_lock, but in practice holding acpi_scan_lock is
> sufficient for that too.  However, its users may not know whether or not
> they operate under acpi_scan_lock and at least in some cases it is not accessed
> in a safe way (note that ACPI devices may go away as a result of hot-remove,
> unlike OF nodes).
> 
> For this reason, it is better to consolidate the code that needs to walk the
> children of an ACPI device which is the purpose of this patch series.
> 
> Overall, it switches over all of the users of the list of children in struct
> acpi_device to using helpers based on the driver core's mechanics and finally
> drops that list, but some extra cleanups are done on the way.
> 
> Please refer to the patch changelogs for details.

Cool series, thanks for doing that!

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Revieweed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
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-- 
With Best Regards,
Andy Shevchenko