Merge tag 'acpi-6.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "Add a new ACPI-related quirk for Vexia EDU ATLA 10 tablet 5V (Hans de
  Goede) and fix the MADT parsing code so that CPUs with different entry
  types (LAPIC and x2APIC) are initialized in the order in which they
  appear in the MADT as required by the ACPI specification (Zhang Rui)"

* tag 'acpi-6.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  x86/acpi: Fix LAPIC/x2APIC parsing order
  ACPI: x86: Add skip i2c clients quirk for Vexia EDU ATLA 10 tablet 5V

Author: torvalds

arch/x86/kernel/acpi/boot.c

@@ -226,6 +226,28 @@ acpi_parse_x2apic(union acpi_subtable_headers *header, const unsigned long end)
 	return 0;
 }
 
+static int __init
+acpi_check_lapic(union acpi_subtable_headers *header, const unsigned long end)
+{
+	struct acpi_madt_local_apic *processor = NULL;
+
+	processor = (struct acpi_madt_local_apic *)header;
+
+	if (BAD_MADT_ENTRY(processor, end))
+		return -EINVAL;
+
+	/* Ignore invalid ID */
+	if (processor->id == 0xff)
+		return 0;
+
+	/* Ignore processors that can not be onlined */
+	if (!acpi_is_processor_usable(processor->lapic_flags))
+		return 0;
+
+	has_lapic_cpus = true;
+	return 0;
+}
+
 static int __init
 acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
 {
@@ -257,7 +279,6 @@ acpi_parse_lapic(union acpi_subtable_headers * header, const unsigned long end)
 			       processor->processor_id, /* ACPI ID */
 			       processor->lapic_flags & ACPI_MADT_ENABLED);
 
-	has_lapic_cpus = true;
 	return 0;
 }
 
@@ -1026,6 +1047,8 @@ static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
 static int __init acpi_parse_madt_lapic_entries(void)
 {
 	int count, x2count = 0;
+	struct acpi_subtable_proc madt_proc[2];
+	int ret;
 
 	if (!boot_cpu_has(X86_FEATURE_APIC))
 		return -ENODEV;
@@ -1034,10 +1057,27 @@ static int __init acpi_parse_madt_lapic_entries(void)
 				      acpi_parse_sapic, MAX_LOCAL_APIC);
 
 	if (!count) {
-		count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC,
-					acpi_parse_lapic, MAX_LOCAL_APIC);
-		x2count = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_X2APIC,
-					acpi_parse_x2apic, MAX_LOCAL_APIC);
+		/* Check if there are valid LAPIC entries */
+		acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC, acpi_check_lapic, MAX_LOCAL_APIC);
+
+		/*
+		 * Enumerate the APIC IDs in the order that they appear in the
+		 * MADT, no matter LAPIC entry or x2APIC entry is used.
+		 */
+		memset(madt_proc, 0, sizeof(madt_proc));
+		madt_proc[0].id = ACPI_MADT_TYPE_LOCAL_APIC;
+		madt_proc[0].handler = acpi_parse_lapic;
+		madt_proc[1].id = ACPI_MADT_TYPE_LOCAL_X2APIC;
+		madt_proc[1].handler = acpi_parse_x2apic;
+		ret = acpi_table_parse_entries_array(ACPI_SIG_MADT,
+				sizeof(struct acpi_table_madt),
+				madt_proc, ARRAY_SIZE(madt_proc), MAX_LOCAL_APIC);
+		if (ret < 0) {
+			pr_err("Error parsing LAPIC/X2APIC entries\n");
+			return ret;
+		}
+		count = madt_proc[0].count;
+		x2count = madt_proc[1].count;
 	}
 	if (!count && !x2count) {
 		pr_err("No LAPIC entries present\n");

drivers/acpi/x86/utils.c

@@ -407,6 +407,19 @@ static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
 		.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
 					ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
 	},
+	{
+		/* Vexia Edu Atla 10 tablet 5V version */
+		.matches = {
+			/* Having all 3 of these not set is somewhat unique */
+			DMI_MATCH(DMI_SYS_VENDOR, "To be filled by O.E.M."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "To be filled by O.E.M."),
+			DMI_MATCH(DMI_BOARD_NAME, "To be filled by O.E.M."),
+			/* Above strings are too generic, also match on BIOS date */
+			DMI_MATCH(DMI_BIOS_DATE, "05/14/2015"),
+		},
+		.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
+					ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
+	},
 	{
 		/* Vexia Edu Atla 10 tablet 9V version */
 		.matches = {