Re: [PATCH v1 0/3] ACPI: bus: Rework acquiring the primary physical for a given ACPI one

On Mon, Aug 10, 2026 at 1:40 PM Rafael J. Wysocki <[email protected]> wrote:
>
> Hi All,
>
> This is somewhat late, but since there will be follow-up changes tree-wide,
> it would be good to get it into the mainline sooner than later.
>
> It is based on the observation that the majority of
> acpi_get_first_physical_node() callers want to hold a reference on the returned
> device and the function is potentially racy because it doesn't get such a
> reference itself.  There were also some comments from Sashiko pointing
> out to this as a "preexisting issue".
>
> The first patch adds a acpi_get_first_physical_node() replacement called
> acpi_bus_get_primary_device() and returning a reference-counted device (the
> former is retained for the time being, but made use the same code as the
> latter).
>
> The next two patches change the core ACPI code to use the new function
> instead of the old one.
>
> Later on, patches will be sent to switch all of the callers of
> acpi_get_first_physical_node() over to using acpi_bus_get_primary_device()
> and finally to drop the former.
>
> Thanks!

I should have mentioned that this series applies to the linux-next
branch of the linux-pm.git tree (and will apply to linux-next when
that branch is included into it).