6.6-stable review patch. If anyone has any objections, please let me know.
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From: Aubrey Li aubrey.li@linux.intel.com
commit 7f5704b6a143b8eca640cba820968e798d065e91 upstream.
Commit 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context") added unnecessary strict handler address checks, causing the PRM module to fail in translating memory error addresses.
Both static data buffer address and ACPI parameter buffer address may be NULL if they are not needed, as described in section 4.1.2 PRM Handler Information Structure of Platform Runtime Mechanism specification [1].
Here are two examples from real hardware:
----PRMT.dsl----
- staic data address is not used [10Ch 0268 2] Revision : 0000 [10Eh 0270 2] Length : 002C [110h 0272 16] Handler GUID : F6A58D47-E04F-4F5A-86B8-2A50D4AA109B [120h 0288 8] Handler address : 0000000065CE51F4 [128h 0296 8] Satic Data Address : 0000000000000000 [130h 0304 8] ACPI Parameter Address : 000000006522A718
- ACPI parameter address is not used [1B0h 0432 2] Revision : 0000 [1B2h 0434 2] Length : 002C [1B4h 0436 16] Handler GUID : 657E8AE6-A8FC-4877-BB28-42E7DE1899A5 [1C4h 0452 8] Handler address : 0000000065C567C8 [1CCh 0460 8] Satic Data Address : 000000006113FB98 [1D4h 0468 8] ACPI Parameter Address : 0000000000000000
Fixes: 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context") Reported-and-tested-by: Shi Liu aurelianliu@tencent.com Cc: All applicable stable@vger.kernel.org Signed-off-by: Aubrey Li aubrey.li@linux.intel.com Link: https://uefi.org/sites/default/files/resources/Platform%20Runtime%20Mechanis... # [1] Reviewed-by: Koba Ko kobak@nvidia.com Acked-by: Ard Biesheuvel ardb@kernel.org Link: https://patch.msgid.link/20250126022250.3014210-1-aubrey.li@linux.intel.com [ rjw: Minor changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/acpi/prmt.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/acpi/prmt.c +++ b/drivers/acpi/prmt.c @@ -263,9 +263,7 @@ static acpi_status acpi_platformrt_space if (!handler || !module) goto invalid_guid;
- if (!handler->handler_addr || - !handler->static_data_buffer_addr || - !handler->acpi_param_buffer_addr) { + if (!handler->handler_addr) { buffer->prm_status = PRM_HANDLER_ERROR; return AE_OK; }