ACPI, APEI: Fixup incorrect 64-bit access width firmware bug

The bit width check was introduced by 15afae60 (ACPI, APEI: Fix
incorrect APEI register bit width check and usage), and a fixup
for incorrect 32-bit width memory address was given by f712c71
(ACPI, APEI: Fixup common access width firmware bug). Now there
is a similar symptom:

[Firmware Bug]: APEI: Invalid bit width + offset in GAR [0x12345000/64/0/3/0]

Another bogus BIOS reports an incorrect 64-bit width in trigger table.
Thus, apply to a similar workaround for 64-bit width memory address.

Signed-off-by: Lans Zhang <jia.zhang@windriver.com>
Acked-by: Gary Hade <garyhade@us.ibm.com>
Acked-by: Myron Stowe <myron.stowe@redhat.com>
Acked-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/apei/apei-base.c b/drivers/acpi/apei/apei-base.c
index 00a7836..46f80e2 100644 (file)
--- a/drivers/acpi/apei/apei-base.c
+++ b/drivers/acpi/apei/apei-base.c
@@ -590,6 +590,9 @@ static int apei_check_gar(struct acpi_generic_address *reg, u64 *paddr,
        if (bit_width == 32 && bit_offset == 0 && (*paddr & 0x03) == 0 &&
            *access_bit_width < 32)
                *access_bit_width = 32;
+       else if (bit_width == 64 && bit_offset == 0 && (*paddr & 0x07) == 0 &&
+           *access_bit_width < 64)
+               *access_bit_width = 64;
 
        if ((bit_width + bit_offset) > *access_bit_width) {
                pr_warning(FW_BUG APEI_PFX