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ACPI: scan: Do not combine resources that overlap completely

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Commit f234fdaae1 ("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: f234fdaae1 ("ACPI: scan: Avoid registering platform devices with resource overlaps")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Closes: https://lore.kernel.org/linux-acpi/20260819003752.GA3063251@ax162/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://patch.msgid.link/12955564.O9o76ZdvQC@rafael.j.wysocki
This commit is contained in:
Rafael J. Wysocki 2026-08-20 21:11:14 +02:00
parent dc948f8b38
commit 7617cc05df
1 changed files with 7 additions and 1 deletions
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8
drivers/acpi/acpi_platform.c
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@ -85,7 +85,13 @@ static unsigned int acpi_platform_adjust_resources(struct acpi_device *adev,
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;