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forked fromtorvalds/linux

Commit0f27cff

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praritrafaeljw
authored andcommitted
ACPI: sysfs: Make ACPI GPE mask kernel parameter cover all GPEs
The acpi_mask_gpe= kernel parameter documentation states that the rangeof mask is 128 GPEs (0x00 to 0x7F). The acpi_masked_gpes mask is a u64 soonly 64 GPEs (0x00 to 0x3F) can really be masked.Use a bitmap of size 0xFF instead of a u64 for the GPE mask so 256GPEs can be masked.Fixes:9c4aa1e (ACPI / sysfs: Provide quirk mechanism to prevent GPE flooding)Signed-off-by: Prarit Bharava <prarit@redhat.com>Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent50c4c4e commit0f27cff

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2 files changed

+8
-19
lines changed

2 files changed

+8
-19
lines changed

‎Documentation/admin-guide/kernel-parameters.txt‎

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -114,7 +114,6 @@
114114
This facility can be used to prevent such uncontrolled
115115
GPE floodings.
116116
Format: <int>
117-
Support masking of GPEs numbered from 0x00 to 0x7f.
118117

119118
acpi_no_auto_serialize[HW,ACPI]
120119
Disable auto-serialization of AML methods

‎drivers/acpi/sysfs.c‎

Lines changed: 8 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -816,22 +816,16 @@ static ssize_t counter_set(struct kobject *kobj,
816816
* interface:
817817
* echo unmask > /sys/firmware/acpi/interrupts/gpe00
818818
*/
819-
820-
/*
821-
* Currently, the GPE flooding prevention only supports to mask the GPEs
822-
* numbered from 00 to 7f.
823-
*/
824-
#defineACPI_MASKABLE_GPE_MAX0x80
825-
826-
staticu64__initdataacpi_masked_gpes;
819+
#defineACPI_MASKABLE_GPE_MAX0xFF
820+
staticDECLARE_BITMAP(acpi_masked_gpes_map,ACPI_MASKABLE_GPE_MAX)__initdata;
827821

828822
staticint__initacpi_gpe_set_masked_gpes(char*val)
829823
{
830824
u8gpe;
831825

832826
if (kstrtou8(val,0,&gpe)||gpe>ACPI_MASKABLE_GPE_MAX)
833827
return-EINVAL;
834-
acpi_masked_gpes |= ((u64)1<<gpe);
828+
set_bit(gpe,acpi_masked_gpes_map);
835829

836830
return1;
837831
}
@@ -843,15 +837,11 @@ void __init acpi_gpe_apply_masked_gpes(void)
843837
acpi_statusstatus;
844838
u8gpe;
845839

846-
for (gpe=0;
847-
gpe<min_t(u8,ACPI_MASKABLE_GPE_MAX,acpi_current_gpe_count);
848-
gpe++) {
849-
if (acpi_masked_gpes& ((u64)1<<gpe)) {
850-
status=acpi_get_gpe_device(gpe,&handle);
851-
if (ACPI_SUCCESS(status)) {
852-
pr_info("Masking GPE 0x%x.\n",gpe);
853-
(void)acpi_mask_gpe(handle,gpe, TRUE);
854-
}
840+
for_each_set_bit(gpe,acpi_masked_gpes_map,ACPI_MASKABLE_GPE_MAX) {
841+
status=acpi_get_gpe_device(gpe,&handle);
842+
if (ACPI_SUCCESS(status)) {
843+
pr_info("Masking GPE 0x%x.\n",gpe);
844+
(void)acpi_mask_gpe(handle,gpe, TRUE);
855845
}
856846
}
857847
}

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