On Sat, Aug 29, 2026 at 12:43:30AM +0200, Julien wrote: > On Thu, Aug 20, 2026 at 9:11 PM Rafael J. Wysocki <[email protected]> wrote: > > > > From: "Rafael J. Wysocki" <[email protected]> > > > > Commit f234fdaae1ca ("ACPI: scan: Avoid registering platform devices > > with resource overlaps") attempted to avoid platform device registration > > errors due to overlaps of resources of the same type returned by the > > same _CRS object in the ACPI tables. It did that by combining two or > > more overlapping resources into one, but it went too far and also > > caused resources that overlap completely to be combined which broke > > the arm-cmn driver that expects two MMIO resources to be present for > > each device it binds to and it expects those two resources to overlap > > completely. > > > > Address this issue by adding checks for completely overlapping > > resources to acpi_platform_adjust_resources() and add a comment > > explaining what is done there. > > > > Fixes: f234fdaae1ca ("ACPI: scan: Avoid registering platform devices with > > resource overlaps") > > Reported-by: Nathan Chancellor <[email protected]> > > Tested-by: Nathan Chancellor <[email protected]> > > Closes: https://lore.kernel.org/linux-acpi/20260819003752.GA3063251@ax162/ > > Signed-off-by: Rafael J. Wysocki <[email protected]> > > --- > > > > v1 -> v2: > > * It is better to check for complete overlaps both ways as suggested > > by Sashiko. > > > > @Julien: I would appreciate testing this on the machine that needed > > commit f234fdaae1ca. > > > > --- > > drivers/acpi/acpi_platform.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > --- a/drivers/acpi/acpi_platform.c > > +++ b/drivers/acpi/acpi_platform.c > > @@ -85,7 +85,13 @@ static unsigned int acpi_platform_adjust > > for (i = 0; i < count; ) { > > struct resource *res = &resources[i]; > > > > - if (resource_type(new_res) != resource_type(res) || > > + /* > > + * Look for overlaps of resources of the same type that > > would > > + * cause resource insertion to fail down the road. > > + */ > > + if (__resource_contains_unbound(res, new_res) || > > + __resource_contains_unbound(new_res, res) || > > + resource_type(new_res) != resource_type(res) || > > !resource_union(new_res, res, new_res)) { > > i++; > > continue; > > > > > > > > I have tested this on commit 1b78070aaef6. It seems the patch is > already included in it. > > TPM device still works. Here are the logs. > acpi MSFT0101:00: [mem 0xfed40000-0xfed4103f] expanded due to overlap > tpm_crb_acpi MSFT0101:00: [Firmware Bug]: Bad ACPI memory layout > > If in the future if I need to make tests again, should I do them on > the Linus Torvalds' branch?
What was the hardware where this happens? Sorry, if I've ignored it (if it was mentioned previously). BR, Jarkko
