4 files changed, 46 insertions, 11 deletions

diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c
index ffdcfcd4a10d..01abf26764b0 100644
--- a/drivers/acpi/acpi_pnp.c
+++ b/drivers/acpi/acpi_pnp.c
@@ -348,10 +348,22 @@ static bool acpi_pnp_match(const char *idstr, const struct acpi_device_id **matc
 	return false;
 }
 
+/*
+ * If one of the device IDs below is present in the list of device IDs of a
+ * given ACPI device object, the PNP scan handler will not attach to that
+ * object, because there is a proper non-PNP driver in the kernel for the
+ * device represented by it.
+ */
+static const struct acpi_device_id acpi_nonpnp_device_ids[] = {
+	{"INTC1080"},
+	{"INTC1081"},
+	{""},
+};
+
 static int acpi_pnp_attach(struct acpi_device *adev,
 			   const struct acpi_device_id *id)
 {
-	return 1;
+	return !!acpi_match_device_ids(adev, acpi_nonpnp_device_ids);
 }
 
 static struct acpi_scan_handler acpi_pnp_handler = {
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 7bf882fcd64b..5a01c2a1567f 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -147,7 +147,7 @@ static void lapic_timer_check_state(int state, struct acpi_processor *pr,
 
 static void __lapic_timer_propagate_broadcast(void *arg)
 {
-	struct acpi_processor *pr = (struct acpi_processor *) arg;
+	struct acpi_processor *pr = arg;
 
 	if (pr->power.timer_broadcast_on_state < INT_MAX)
 		tick_broadcast_enable();
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 970f04a958cd..4265814c74f8 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -53,6 +53,8 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 {
 	acpi_status status = 0;
 	unsigned long long ppc = 0;
+	s32 qos_value;
+	int index;
 	int ret;
 
 	if (!pr)
@@ -72,17 +74,30 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 		}
 	}
 
+	index = ppc;
+
+	if (pr->performance_platform_limit == index ||
+	    ppc >= pr->performance->state_count)
+		return 0;
+
 	pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
-		       (int)ppc, ppc ? "" : "not");
+		 index, index ? "is" : "is not");
 
-	pr->performance_platform_limit = (int)ppc;
+	pr->performance_platform_limit = index;
 
-	if (ppc >= pr->performance->state_count ||
-	    unlikely(!freq_qos_request_active(&pr->perflib_req)))
+	if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
 		return 0;
 
-	ret = freq_qos_update_request(&pr->perflib_req,
-			pr->performance->states[ppc].core_frequency * 1000);
+	/*
+	 * If _PPC returns 0, it means that all of the available states can be
+	 * used ("no limit").
+	 */
+	if (index == 0)
+		qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
+	else
+		qos_value = pr->performance->states[index].core_frequency * 1000;
+
+	ret = freq_qos_update_request(&pr->perflib_req, qos_value);
 	if (ret < 0) {
 		pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
 			pr->id, ret);
@@ -166,9 +181,16 @@ void acpi_processor_ppc_init(struct cpufreq_policy *policy)
 		if (!pr)
 			continue;
 
+		/*
+		 * Reset performance_platform_limit in case there is a stale
+		 * value in it, so as to make it match the "no limit" QoS value
+		 * below.
+		 */
+		pr->performance_platform_limit = 0;
+
 		ret = freq_qos_add_request(&policy->constraints,
-					   &pr->perflib_req,
-					   FREQ_QOS_MAX, INT_MAX);
+					   &pr->perflib_req, FREQ_QOS_MAX,
+					   FREQ_QOS_MAX_DEFAULT_VALUE);
 		if (ret < 0)
 			pr_err("Failed to add freq constraint for CPU%d (%d)\n",
 			       cpu, ret);
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 5fbc32b802d0..7b4680da57d7 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -555,7 +555,8 @@ static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
 	ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
 	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
-	ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI };
+	ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
+	ACPI_SIG_NBFT };
 
 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)