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ACPI: sysfs: Change ACPI_MASKABLE_GPE_MAX to 0x100

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The commit 0f27cff859 ("ACPI: sysfs: Make ACPI GPE mask kernel
parameter cover all GPEs") says:
  "Use a bitmap of size 0xFF instead of a u64 for the GPE mask so 256
   GPEs can be masked"

But the masking of GPE 0xFF it not supported and the check condition
"gpe > ACPI_MASKABLE_GPE_MAX" is not valid because the type of gpe is
u8.

So modify the macro ACPI_MASKABLE_GPE_MAX to 0x100, and drop the "gpe >
ACPI_MASKABLE_GPE_MAX" check. In addition, update the docs "Format" for
acpi_mask_gpe parameter.

Fixes: 0f27cff859 ("ACPI: sysfs: Make ACPI GPE mask kernel parameter cover all GPEs")
Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
[ rjw: Use u16 as gpe data type in acpi_gpe_apply_masked_gpes() ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Yunfeng Ye 2019-11-14 15:16:24 +08:00 committed by Rafael J. Wysocki
parent af42d3466b
commit a7583e72a5
2 changed files with 4 additions and 4 deletions
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2
Documentation/admin-guide/kernel-parameters.txt
View File

@ -113,7 +113,7 @@
the GPE dispatcher.
This facility can be used to prevent such uncontrolled
GPE floodings.
Format: <int>
Format: <byte>
acpi_no_auto_serialize [HW,ACPI]
Disable auto-serialization of AML methods

6
drivers/acpi/sysfs.c
View File

@ -819,14 +819,14 @@ end:
* interface:
* echo unmask > /sys/firmware/acpi/interrupts/gpe00
*/
#define ACPI_MASKABLE_GPE_MAX 0xFF
#define ACPI_MASKABLE_GPE_MAX 0x100
static DECLARE_BITMAP(acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) __initdata;
static int __init acpi_gpe_set_masked_gpes(char *val)
{
u8 gpe;
if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX)
if (kstrtou8(val, 0, &gpe))
return -EINVAL;
set_bit(gpe, acpi_masked_gpes_map);
@ -838,7 +838,7 @@ void __init acpi_gpe_apply_masked_gpes(void)
{
acpi_handle handle;
acpi_status status;
u8 gpe;
u16 gpe;
for_each_set_bit(gpe, acpi_masked_gpes_map, ACPI_MASKABLE_GPE_MAX) {
status = acpi_get_gpe_device(gpe, &handle);