Re: [PATCH v3] ACPI: scan: Avoid registering platform devices with resource overlaps

[Rafael J. Wysocki (Intel)]

Hi Nathan,

On Wed, Aug 19, 2026 at 2:37 AM Nathan Chancellor <nathan@xxxxxxxxxx> wrote:
>
> Hi Rafael,
>
> On Fri, Aug 07, 2026 at 12:22:37PM +0200, Rafael J. Wysocki wrote:
> > From: "Rafael J. Wysocki" <rafael.j.wysocki@xxxxxxxxx>
> >
> > If acpi_dev_get_resources() returns overlapping I/O or memory resources,
> > the subsequent registration of a platform device will fail with -EBUSY
> > due to a resource conflict.  This is reported to happen on Acer Aspire
> > ES1-572 [1].
> >
> > Avoid that by adjusting resources returned by acpi_dev_get_resources()
> > to eliminate partial overlaps between them.
> >
> > This has not been regarded as necessary before because putting
> > overlapping resources into the _CRS of one device is really pointless,
> > but now that the issue has been reported to actually happen in the
> > field, it needs to be done.
> >
> > Fixes: ab06eb920401 ("ACPI: scan: Register platform devices for fixed event buttons")
> > Reported-by: Julien <julien82453@xxxxxxxxx>
> > Closes: https://lore.kernel.org/linux-integrity/CAJOGg3z6LJPDsdPNBxajgy8_wQxfhYBRxe4EiurZf3kPU5A5Bw@xxxxxxxxxxxxxx/ [1]
> > Cc: All applicable <stable@xxxxxxxxxxxxxxx>
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> I bisected the following kernel message that I see on one of my aarch64
> test machines to this change in -next as commit f234fdaae1ca ("ACPI:
> scan: Avoid registering platform devices with resource overlaps"):
>
>   arm-cmn ARMHC600:00: probe with driver arm-cmn failed with error -22
>
> Is this expected? If not, what information would be helpful for debugging this?

No, it is not.

First, please send a boot log from the failing machine.

Second, I think we may need the acpidump output from it.