Merge tag 'acpi-6.1-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more ACPI updates from Rafael Wysocki:
 "These fix two issues, in APEI and in the int3472 driver, clean up the
  ACPI thermal driver, add ACPI support for non-GPE system wakeup events
  and make the system reboot code use the S5 (system off) state by
  default.

  Specifics:

   - Fix ACPI device object reference counting in (recently updated)
     skl_int3472_fill_clk_pdata() (Andy Shevchenko).

   - Fix a memory leak in APEI by avoiding to add a task_work to kernel
     threads running when an asynchronous error is detected (Shuai Xue).

   - Add ACPI support for handling system wakeups via GPIO wake capable
     IRQs in addition to GPEs (Raul E Rangel).

   - Make the system reboot code put ACPI-enabled systems into the S5
     (system off) state which is necessary for some platforms to work as
     expected (Kai-Heng Feng).

   - Make the white space usage in the ACPI thermal driver more
     consistent and drop redundant code from it (Rafael Wysocki)"

* tag 'acpi-6.1-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: thermal: Drop some redundant code
  ACPI: thermal: Drop redundant parens from expressions
  ACPI: thermal: Use white space more consistently
  platform/x86: int3472: Don't leak reference on error
  ACPI: APEI: do not add task_work to kernel thread to avoid memory leak
  PM: ACPI: reboot: Reinstate S5 for reboot
  kernel/reboot: Add SYS_OFF_MODE_RESTART_PREPARE mode
  ACPI: PM: Take wake IRQ into consideration when entering suspend-to-idle
  i2c: acpi: Use ACPI wake capability bit to set wake_irq
  ACPI: resources: Add wake_capable parameter to acpi_dev_irq_flags
  gpiolib: acpi: Add wake_capable variants of acpi_dev_gpio_irq_get

17 files changed, 245 insertions, 146 deletions

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index d91ad378c00d..80ad530583c9 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -985,7 +985,7 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
 				ghes_estatus_cache_add(generic, estatus);
 		}
 
-		if (task_work_pending && current->mm != &init_mm) {
+		if (task_work_pending && current->mm) {
 			estatus_node->task_work.func = ghes_kick_task_work;
 			estatus_node->task_work_cpu = smp_processor_id();
 			ret = task_work_add(current, &estatus_node->task_work,
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index d594effe905f..97450f4003cc 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -687,7 +687,22 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
 		d_min = ret;
 		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
 			&& adev->wakeup.sleep_state >= target_state;
+	} else if (device_may_wakeup(dev) && dev->power.wakeirq) {
+		/*
+		 * The ACPI subsystem doesn't manage the wake bit for IRQs
+		 * defined with ExclusiveAndWake and SharedAndWake. Instead we
+		 * expect them to be managed via the PM subsystem. Drivers
+		 * should call dev_pm_set_wake_irq to register an IRQ as a wake
+		 * source.
+		 *
+		 * If a device has a wake IRQ attached we need to check the
+		 * _S0W method to get the correct wake D-state. Otherwise we
+		 * end up putting the device into D3Cold which will more than
+		 * likely disable wake functionality.
+		 */
+		wakeup = true;
 	} else {
+		/* ACPI GPE is specified in _PRW. */
 		wakeup = adev->wakeup.flags.valid;
 	}
 
diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c
index 4db5bb587599..1cc4647f78b8 100644
--- a/drivers/acpi/irq.c
+++ b/drivers/acpi/irq.c
@@ -147,6 +147,7 @@ struct acpi_irq_parse_one_ctx {
  * @polarity: polarity attributes of hwirq
  * @polarity: polarity attributes of hwirq
  * @shareable: shareable attributes of hwirq
+ * @wake_capable: wake capable attribute of hwirq
  * @ctx: acpi_irq_parse_one_ctx updated by this function
  *
  * Description:
@@ -156,12 +157,13 @@ struct acpi_irq_parse_one_ctx {
 static inline void acpi_irq_parse_one_match(struct fwnode_handle *fwnode,
 					    u32 hwirq, u8 triggering,
 					    u8 polarity, u8 shareable,
+					    u8 wake_capable,
 					    struct acpi_irq_parse_one_ctx *ctx)
 {
 	if (!fwnode)
 		return;
 	ctx->rc = 0;
-	*ctx->res_flags = acpi_dev_irq_flags(triggering, polarity, shareable);
+	*ctx->res_flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
 	ctx->fwspec->fwnode = fwnode;
 	ctx->fwspec->param[0] = hwirq;
 	ctx->fwspec->param[1] = acpi_dev_get_irq_type(triggering, polarity);
@@ -204,7 +206,7 @@ static acpi_status acpi_irq_parse_one_cb(struct acpi_resource *ares,
 		fwnode = acpi_get_gsi_domain_id(irq->interrupts[ctx->index]);
 		acpi_irq_parse_one_match(fwnode, irq->interrupts[ctx->index],
 					 irq->triggering, irq->polarity,
-					 irq->shareable, ctx);
+					 irq->shareable, irq->wake_capable, ctx);
 		return AE_CTRL_TERMINATE;
 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 		eirq = &ares->data.extended_irq;
@@ -218,7 +220,7 @@ static acpi_status acpi_irq_parse_one_cb(struct acpi_resource *ares,
 						      eirq->interrupts[ctx->index]);
 		acpi_irq_parse_one_match(fwnode, eirq->interrupts[ctx->index],
 					 eirq->triggering, eirq->polarity,
-					 eirq->shareable, ctx);
+					 eirq->shareable, eirq->wake_capable, ctx);
 		return AE_CTRL_TERMINATE;
 	}
 
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 514d89656dde..6f9489edfb4e 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -336,8 +336,9 @@ EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
  * @triggering: Triggering type as provided by ACPI.
  * @polarity: Interrupt polarity as provided by ACPI.
  * @shareable: Whether or not the interrupt is shareable.
+ * @wake_capable: Wake capability as provided by ACPI.
  */
-unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
+unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable, u8 wake_capable)
 {
 	unsigned long flags;
 
@@ -351,6 +352,9 @@ unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
 	if (shareable == ACPI_SHARED)
 		flags |= IORESOURCE_IRQ_SHAREABLE;
 
+	if (wake_capable == ACPI_WAKE_CAPABLE)
+		flags |= IORESOURCE_IRQ_WAKECAPABLE;
+
 	return flags | IORESOURCE_IRQ;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
@@ -468,7 +472,7 @@ static bool acpi_dev_irq_override(u32 gsi, u8 triggering, u8 polarity,
 
 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
 				     u8 triggering, u8 polarity, u8 shareable,
-				     bool check_override)
+				     u8 wake_capable, bool check_override)
 {
 	int irq, p, t;
 
@@ -501,7 +505,7 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
 		}
 	}
 
-	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
+	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable, wake_capable);
 	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
 	if (irq >= 0) {
 		res->start = irq;
@@ -549,7 +553,8 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 		}
 		acpi_dev_get_irqresource(res, irq->interrupts[index],
 					 irq->triggering, irq->polarity,
-					 irq->shareable, true);
+					 irq->shareable, irq->wake_capable,
+					 true);
 		break;
 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 		ext_irq = &ares->data.extended_irq;
@@ -560,7 +565,8 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 		if (is_gsi(ext_irq))
 			acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
 					 ext_irq->triggering, ext_irq->polarity,
-					 ext_irq->shareable, false);
+					 ext_irq->shareable, ext_irq->wake_capable,
+					 false);
 		else
 			irqresource_disabled(res, 0);
 		break;
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index ad4b2987b3d6..0b557c0d405e 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -1088,6 +1088,14 @@ int __init acpi_sleep_init(void)
 		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
 					 SYS_OFF_PRIO_FIRMWARE,
 					 acpi_power_off, NULL);
+
+		/*
+		 * Windows uses S5 for reboot, so some BIOSes depend on it to
+		 * perform proper reboot.
+		 */
+		register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
+					 SYS_OFF_PRIO_FIRMWARE,
+					 acpi_power_off_prepare, NULL);
 	} else {
 		acpi_no_s5 = true;
 	}
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 539660ef93c7..40b07057983e 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -158,7 +158,7 @@ struct acpi_thermal_flags {
 };
 
 struct acpi_thermal {
-	struct acpi_device * device;
+	struct acpi_device *device;
 	acpi_bus_id name;
 	unsigned long temperature;
 	unsigned long last_temperature;
@@ -262,7 +262,7 @@ do {	\
 
 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 {
-	acpi_status status = AE_OK;
+	acpi_status status;
 	unsigned long long tmp;
 	struct acpi_handle_list devices;
 	int valid = 0;
@@ -270,8 +270,7 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 
 	/* Critical Shutdown */
 	if (flag & ACPI_TRIPS_CRITICAL) {
-		status = acpi_evaluate_integer(tz->device->handle,
-				"_CRT", NULL, &tmp);
+		status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
 		tz->trips.critical.temperature = tmp;
 		/*
 		 * Treat freezing temperatures as invalid as well; some
@@ -284,8 +283,7 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 			acpi_handle_debug(tz->device->handle,
 					  "No critical threshold\n");
 		} else if (tmp <= 2732) {
-			pr_info(FW_BUG "Invalid critical threshold (%llu)\n",
-				tmp);
+			pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
 			tz->trips.critical.flags.valid = 0;
 		} else {
 			tz->trips.critical.flags.valid = 1;
@@ -312,8 +310,7 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 
 	/* Critical Sleep (optional) */
 	if (flag & ACPI_TRIPS_HOT) {
-		status = acpi_evaluate_integer(tz->device->handle,
-				"_HOT", NULL, &tmp);
+		status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
 		if (ACPI_FAILURE(status)) {
 			tz->trips.hot.flags.valid = 0;
 			acpi_handle_debug(tz->device->handle,
@@ -329,7 +326,7 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 
 	/* Passive (optional) */
 	if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
-		(flag == ACPI_TRIPS_INIT)) {
+	    flag == ACPI_TRIPS_INIT) {
 		valid = tz->trips.passive.flags.valid;
 		if (psv == -1) {
 			status = AE_SUPPORT;
@@ -338,32 +335,31 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 			status = AE_OK;
 		} else {
 			status = acpi_evaluate_integer(tz->device->handle,
-				"_PSV", NULL, &tmp);
+						       "_PSV", NULL, &tmp);
 		}
 
-		if (ACPI_FAILURE(status))
+		if (ACPI_FAILURE(status)) {
 			tz->trips.passive.flags.valid = 0;
-		else {
+		} else {
 			tz->trips.passive.temperature = tmp;
 			tz->trips.passive.flags.valid = 1;
 			if (flag == ACPI_TRIPS_INIT) {
-				status = acpi_evaluate_integer(
-						tz->device->handle, "_TC1",
-						NULL, &tmp);
+				status = acpi_evaluate_integer(tz->device->handle,
+							       "_TC1", NULL, &tmp);
 				if (ACPI_FAILURE(status))
 					tz->trips.passive.flags.valid = 0;
 				else
 					tz->trips.passive.tc1 = tmp;
-				status = acpi_evaluate_integer(
-						tz->device->handle, "_TC2",
-						NULL, &tmp);
+
+				status = acpi_evaluate_integer(tz->device->handle,
+							       "_TC2", NULL, &tmp);
 				if (ACPI_FAILURE(status))
 					tz->trips.passive.flags.valid = 0;
 				else
 					tz->trips.passive.tc2 = tmp;
-				status = acpi_evaluate_integer(
-						tz->device->handle, "_TSP",
-						NULL, &tmp);
+
+				status = acpi_evaluate_integer(tz->device->handle,
+							       "_TSP", NULL, &tmp);
 				if (ACPI_FAILURE(status))
 					tz->trips.passive.flags.valid = 0;
 				else
@@ -374,25 +370,25 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 	if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
 		memset(&devices, 0, sizeof(struct acpi_handle_list));
 		status = acpi_evaluate_reference(tz->device->handle, "_PSL",
-							NULL, &devices);
+						 NULL, &devices);
 		if (ACPI_FAILURE(status)) {
 			acpi_handle_info(tz->device->handle,
 					 "Invalid passive threshold\n");
 			tz->trips.passive.flags.valid = 0;
-		}
-		else
+		} else {
 			tz->trips.passive.flags.valid = 1;
+		}
 
 		if (memcmp(&tz->trips.passive.devices, &devices,
-				sizeof(struct acpi_handle_list))) {
+			   sizeof(struct acpi_handle_list))) {
 			memcpy(&tz->trips.passive.devices, &devices,
-				sizeof(struct acpi_handle_list));
+			       sizeof(struct acpi_handle_list));
 			ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
 		}
 	}
 	if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
 		if (valid != tz->trips.passive.flags.valid)
-				ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
+			ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
 	}
 
 	/* Active (optional) */
@@ -403,29 +399,31 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 		if (act == -1)
 			break; /* disable all active trip points */
 
-		if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
-			tz->trips.active[i].flags.valid)) {
+		if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
+		    tz->trips.active[i].flags.valid)) {
 			status = acpi_evaluate_integer(tz->device->handle,
-							name, NULL, &tmp);
+						       name, NULL, &tmp);
 			if (ACPI_FAILURE(status)) {
 				tz->trips.active[i].flags.valid = 0;
 				if (i == 0)
 					break;
+
 				if (act <= 0)
 					break;
+
 				if (i == 1)
-					tz->trips.active[0].temperature =
-						celsius_to_deci_kelvin(act);
+					tz->trips.active[0].temperature = celsius_to_deci_kelvin(act);
 				else
 					/*
 					 * Don't allow override higher than
 					 * the next higher trip point
 					 */
-					tz->trips.active[i - 1].temperature =
-						(tz->trips.active[i - 2].temperature <
+					tz->trips.active[i-1].temperature =
+						(tz->trips.active[i-2].temperature <
 						celsius_to_deci_kelvin(act) ?
-						tz->trips.active[i - 2].temperature :
+						tz->trips.active[i-2].temperature :
 						celsius_to_deci_kelvin(act));
+
 				break;
 			} else {
 				tz->trips.active[i].temperature = tmp;
@@ -434,22 +432,22 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 		}
 
 		name[2] = 'L';
-		if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
+		if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid) {
 			memset(&devices, 0, sizeof(struct acpi_handle_list));
 			status = acpi_evaluate_reference(tz->device->handle,
-						name, NULL, &devices);
+							 name, NULL, &devices);
 			if (ACPI_FAILURE(status)) {
 				acpi_handle_info(tz->device->handle,
 						 "Invalid active%d threshold\n", i);
 				tz->trips.active[i].flags.valid = 0;
-			}
-			else
+			} else {
 				tz->trips.active[i].flags.valid = 1;
+			}
 
 			if (memcmp(&tz->trips.active[i].devices, &devices,
-					sizeof(struct acpi_handle_list))) {
+				   sizeof(struct acpi_handle_list))) {
 				memcpy(&tz->trips.active[i].devices, &devices,
-					sizeof(struct acpi_handle_list));
+				       sizeof(struct acpi_handle_list));
 				ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
 			}
 		}
@@ -464,9 +462,9 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 	if (flag & ACPI_TRIPS_DEVICES) {
 		memset(&devices, 0, sizeof(devices));
 		status = acpi_evaluate_reference(tz->device->handle, "_TZD",
-						NULL, &devices);
-		if (ACPI_SUCCESS(status)
-		    && memcmp(&tz->devices, &devices, sizeof(devices))) {
+						 NULL, &devices);
+		if (ACPI_SUCCESS(status) &&
+		    memcmp(&tz->devices, &devices, sizeof(devices))) {
 			tz->devices = devices;
 			ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
 		}
@@ -548,8 +546,7 @@ static int thermal_get_trip_type(struct thermal_zone_device *thermal,
 		trip--;
 	}
 
-	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
-		tz->trips.active[i].flags.valid; i++) {
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid; i++) {
 		if (!trip) {
 			*type = THERMAL_TRIP_ACTIVE;
 			return 0;
@@ -572,8 +569,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	if (tz->trips.critical.flags.valid) {
 		if (!trip) {
 			*temp = deci_kelvin_to_millicelsius_with_offset(
-				tz->trips.critical.temperature,
-				tz->kelvin_offset);
+					tz->trips.critical.temperature,
+					tz->kelvin_offset);
 			return 0;
 		}
 		trip--;
@@ -582,8 +579,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	if (tz->trips.hot.flags.valid) {
 		if (!trip) {
 			*temp = deci_kelvin_to_millicelsius_with_offset(
-				tz->trips.hot.temperature,
-				tz->kelvin_offset);
+					tz->trips.hot.temperature,
+					tz->kelvin_offset);
 			return 0;
 		}
 		trip--;
@@ -592,8 +589,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	if (tz->trips.passive.flags.valid) {
 		if (!trip) {
 			*temp = deci_kelvin_to_millicelsius_with_offset(
-				tz->trips.passive.temperature,
-				tz->kelvin_offset);
+					tz->trips.passive.temperature,
+					tz->kelvin_offset);
 			return 0;
 		}
 		trip--;
@@ -603,8 +600,8 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 		tz->trips.active[i].flags.valid; i++) {
 		if (!trip) {
 			*temp = deci_kelvin_to_millicelsius_with_offset(
-				tz->trips.active[i].temperature,
-				tz->kelvin_offset);
+					tz->trips.active[i].temperature,
+					tz->kelvin_offset);
 			return 0;
 		}
 		trip--;
@@ -620,15 +617,16 @@ static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
 
 	if (tz->trips.critical.flags.valid) {
 		*temperature = deci_kelvin_to_millicelsius_with_offset(
-				tz->trips.critical.temperature,
-				tz->kelvin_offset);
+					tz->trips.critical.temperature,
+					tz->kelvin_offset);
 		return 0;
-	} else
-		return -EINVAL;
+	}
+
+	return -EINVAL;
 }
 
 static int thermal_get_trend(struct thermal_zone_device *thermal,
-				int trip, enum thermal_trend *trend)
+			     int trip, enum thermal_trend *trend)
 {
 	struct acpi_thermal *tz = thermal->devdata;
 	enum thermal_trip_type type;
@@ -657,9 +655,8 @@ static int thermal_get_trend(struct thermal_zone_device *thermal,
 	 * tz->temperature has already been updated by generic thermal layer,
 	 * before this callback being invoked
 	 */
-	i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
-		+ (tz->trips.passive.tc2
-		* (tz->temperature - tz->trips.passive.temperature));
+	i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) +
+	    tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature);
 
 	if (i > 0)
 		*trend = THERMAL_TREND_RAISING;
@@ -667,6 +664,7 @@ static int thermal_get_trend(struct thermal_zone_device *thermal,
 		*trend = THERMAL_TREND_DROPPING;
 	else
 		*trend = THERMAL_TREND_STABLE;
+
 	return 0;
 }
 
@@ -691,8 +689,8 @@ static void acpi_thermal_zone_device_critical(struct thermal_zone_device *therma
 }
 
 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
-					struct thermal_cooling_device *cdev,
-					bool bind)
+					  struct thermal_cooling_device *cdev,
+					  bool bind)
 {
 	struct acpi_device *device = cdev->devdata;
 	struct acpi_thermal *tz = thermal->devdata;
@@ -711,22 +709,23 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 
 	if (tz->trips.passive.flags.valid) {
 		trip++;
-		for (i = 0; i < tz->trips.passive.devices.count;
-		    i++) {
+		for (i = 0; i < tz->trips.passive.devices.count; i++) {
 			handle = tz->trips.passive.devices.handles[i];
 			dev = acpi_fetch_acpi_dev(handle);
 			if (dev != device)
 				continue;
+
 			if (bind)
-				result =
-					thermal_zone_bind_cooling_device
-					(thermal, trip, cdev,
-					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
-					 THERMAL_WEIGHT_DEFAULT);
+				result = thermal_zone_bind_cooling_device(
+						thermal, trip, cdev,
+						THERMAL_NO_LIMIT,
+						THERMAL_NO_LIMIT,
+						THERMAL_WEIGHT_DEFAULT);
 			else
 				result =
-					thermal_zone_unbind_cooling_device
-					(thermal, trip, cdev);
+					thermal_zone_unbind_cooling_device(
+						thermal, trip, cdev);
+
 			if (result)
 				goto failed;
 		}
@@ -735,22 +734,24 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 		if (!tz->trips.active[i].flags.valid)
 			break;
+
 		trip++;
-		for (j = 0;
-		    j < tz->trips.active[i].devices.count;
-		    j++) {
+		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
 			handle = tz->trips.active[i].devices.handles[j];
 			dev = acpi_fetch_acpi_dev(handle);
 			if (dev != device)
 				continue;
+
 			if (bind)
-				result = thermal_zone_bind_cooling_device
-					(thermal, trip, cdev,
-					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
-					 THERMAL_WEIGHT_DEFAULT);
+				result = thermal_zone_bind_cooling_device(
+						thermal, trip, cdev,
+						THERMAL_NO_LIMIT,
+						THERMAL_NO_LIMIT,
+						THERMAL_WEIGHT_DEFAULT);
 			else
-				result = thermal_zone_unbind_cooling_device
-					(thermal, trip, cdev);
+				result = thermal_zone_unbind_cooling_device(
+						thermal, trip, cdev);
+
 			if (result)
 				goto failed;
 		}
@@ -762,14 +763,14 @@ failed:
 
 static int
 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
-					struct thermal_cooling_device *cdev)
+				 struct thermal_cooling_device *cdev)
 {
 	return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 }
 
 static int
 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
-					struct thermal_cooling_device *cdev)
+				   struct thermal_cooling_device *cdev)
 {
 	return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 }
@@ -802,20 +803,20 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 	if (tz->trips.passive.flags.valid)
 		trips++;
 
-	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
-			tz->trips.active[i].flags.valid; i++, trips++);
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid;
+	     i++, trips++);
 
 	if (tz->trips.passive.flags.valid)
-		tz->thermal_zone =
-			thermal_zone_device_register("acpitz", trips, 0, tz,
-						&acpi_thermal_zone_ops, NULL,
-						     tz->trips.passive.tsp*100,
-						     tz->polling_frequency*100);
+		tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
+								&acpi_thermal_zone_ops, NULL,
+								tz->trips.passive.tsp * 100,
+								tz->polling_frequency * 100);
 	else
 		tz->thermal_zone =
 			thermal_zone_device_register("acpitz", trips, 0, tz,
-						&acpi_thermal_zone_ops, NULL,
-						0, tz->polling_frequency*100);
+						     &acpi_thermal_zone_ops, NULL,
+						     0, tz->polling_frequency * 100);
+
 	if (IS_ERR(tz->thermal_zone))
 		return -ENODEV;
 
@@ -881,7 +882,6 @@ static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 {
 	struct acpi_thermal *tz = acpi_driver_data(device);
 
-
 	if (!tz)
 		return;
 
@@ -893,13 +893,13 @@ static void acpi_thermal_notify(struct acpi_device *device, u32 event)
 		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
 		acpi_queue_thermal_check(tz);
 		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  dev_name(&device->dev), event, 0);
+						dev_name(&device->dev), event, 0);
 		break;
 	case ACPI_THERMAL_NOTIFY_DEVICES:
 		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
 		acpi_queue_thermal_check(tz);
 		acpi_bus_generate_netlink_event(device->pnp.device_class,
-						  dev_name(&device->dev), event, 0);
+						dev_name(&device->dev), event, 0);
 		break;
 	default:
 		acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
@@ -942,8 +942,7 @@ static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
 
 static int acpi_thermal_get_info(struct acpi_thermal *tz)
 {
-	int result = 0;
-
+	int result;
 
 	if (!tz)
 		return -EINVAL;
@@ -1020,9 +1019,8 @@ static void acpi_thermal_check_fn(struct work_struct *work)
 
 static int acpi_thermal_add(struct acpi_device *device)
 {
-	int result = 0;
-	struct acpi_thermal *tz = NULL;
-
+	struct acpi_thermal *tz;
+	int result;
 
 	if (!device)
 		return -EINVAL;
@@ -1063,7 +1061,7 @@ end:
 
 static int acpi_thermal_remove(struct acpi_device *device)
 {
-	struct acpi_thermal *tz = NULL;
+	struct acpi_thermal *tz;
 
 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;
@@ -1099,6 +1097,7 @@ static int acpi_thermal_resume(struct device *dev)
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
 		if (!tz->trips.active[i].flags.valid)
 			break;
+
 		tz->trips.active[i].flags.enabled = 1;
 		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
 			result = acpi_bus_update_power(
@@ -1119,7 +1118,6 @@ static int acpi_thermal_resume(struct device *dev)
 #endif
 
 static int thermal_act(const struct dmi_system_id *d) {
-
 	if (act == 0) {
 		pr_notice("%s detected: disabling all active thermal trip points\n",
 			  d->ident);
@@ -1128,14 +1126,12 @@ static int thermal_act(const struct dmi_system_id *d) {
 	return 0;
 }
 static int thermal_nocrt(const struct dmi_system_id *d) {
-
 	pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
 		  d->ident);
 	nocrt = 1;
 	return 0;
 }
 static int thermal_tzp(const struct dmi_system_id *d) {
-
 	if (tzp == 0) {
 		pr_notice("%s detected: enabling thermal zone polling\n",
 			  d->ident);
@@ -1144,7 +1140,6 @@ static int thermal_tzp(const struct dmi_system_id *d) {
 	return 0;
 }
 static int thermal_psv(const struct dmi_system_id *d) {
-
 	if (psv == 0) {
 		pr_notice("%s detected: disabling all passive thermal trip points\n",
 			  d->ident);
@@ -1195,7 +1190,7 @@ static const struct dmi_system_id thermal_dmi_table[] __initconst = {
 
 static int __init acpi_thermal_init(void)
 {
-	int result = 0;
+	int result;
 
 	dmi_check_system(thermal_dmi_table);
 
@@ -1222,8 +1217,6 @@ static void __exit acpi_thermal_exit(void)
 {
 	acpi_bus_unregister_driver(&acpi_thermal_driver);
 	destroy_workqueue(acpi_thermal_pm_queue);
-
-	return;
 }
 
 module_init(acpi_thermal_init);
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 285ecbf107c9..a7d2358736fe 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -754,6 +754,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 		lookup->info.pin_config = agpio->pin_config;
 		lookup->info.debounce = agpio->debounce_timeout;
 		lookup->info.gpioint = gpioint;
+		lookup->info.wake_capable = agpio->wake_capable == ACPI_WAKE_CAPABLE;
 
 		/*
 		 * Polarity and triggering are only specified for GpioInt
@@ -1000,10 +1001,11 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
 }
 
 /**
- * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
+ * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
  * @adev: pointer to a ACPI device to get IRQ from
  * @name: optional name of GpioInt resource
  * @index: index of GpioInt resource (starting from %0)
+ * @wake_capable: Set to true if the IRQ is wake capable
  *
  * If the device has one or more GpioInt resources, this function can be
  * used to translate from the GPIO offset in the resource to the Linux IRQ
@@ -1015,9 +1017,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
  * The function takes optional @name parameter. If the resource has a property
  * name, then only those will be taken into account.
  *
+ * The GPIO is considered wake capable if the GpioInt resource specifies
+ * SharedAndWake or ExclusiveAndWake.
+ *
  * Return: Linux IRQ number (> %0) on success, negative errno on failure.
  */
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+				  bool *wake_capable)
 {
 	int idx, i;
 	unsigned int irq_flags;
@@ -1074,13 +1080,16 @@ int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
 				dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
 			}
 
+			if (wake_capable)
+				*wake_capable = info.wake_capable;
+
 			return irq;
 		}
 
 	}
 	return -ENOENT;
 }
-EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
 
 static acpi_status
 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h
index e476558d9471..1ac6816839db 100644
--- a/drivers/gpio/gpiolib-acpi.h
+++ b/drivers/gpio/gpiolib-acpi.h
@@ -18,6 +18,7 @@ struct acpi_device;
  * @pin_config: pin bias as provided by ACPI
  * @polarity: interrupt polarity as provided by ACPI
  * @triggering: triggering type as provided by ACPI
+ * @wake_capable: wake capability as provided by ACPI
  * @debounce: debounce timeout as provided by ACPI
  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
  */
@@ -28,6 +29,7 @@ struct acpi_gpio_info {
 	int pin_config;
 	int polarity;
 	int triggering;
+	bool wake_capable;
 	unsigned int debounce;
 	unsigned int quirks;
 };
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index da6568a20177..4dd777cc0c89 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -137,6 +137,11 @@ static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = {
 	{}
 };
 
+struct i2c_acpi_irq_context {
+	int irq;
+	bool wake_capable;
+};
+
 static int i2c_acpi_do_lookup(struct acpi_device *adev,
 			      struct i2c_acpi_lookup *lookup)
 {
@@ -168,13 +173,19 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
 	return 0;
 }
 
-static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
+static int i2c_acpi_add_irq_resource(struct acpi_resource *ares, void *data)
 {
-	int *irq = data;
+	struct i2c_acpi_irq_context *irq_ctx = data;
 	struct resource r;
 
-	if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
-		*irq = i2c_dev_irq_from_resources(&r, 1);
+	if (irq_ctx->irq > 0)
+		return 1;
+
+	if (!acpi_dev_resource_interrupt(ares, 0, &r))
+		return 1;
+
+	irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1);
+	irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE;
 
 	return 1; /* No need to add resource to the list */
 }
@@ -182,31 +193,40 @@ static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
 /**
  * i2c_acpi_get_irq - get device IRQ number from ACPI
  * @client: Pointer to the I2C client device
+ * @wake_capable: Set to true if the IRQ is wake capable
  *
  * Find the IRQ number used by a specific client device.
  *
  * Return: The IRQ number or an error code.
  */
-int i2c_acpi_get_irq(struct i2c_client *client)
+int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&client->dev);
 	struct list_head resource_list;
-	int irq = -ENOENT;
+	struct i2c_acpi_irq_context irq_ctx = {
+		.irq = -ENOENT,
+	};
 	int ret;
 
 	INIT_LIST_HEAD(&resource_list);
 
 	ret = acpi_dev_get_resources(adev, &resource_list,
-				     i2c_acpi_add_resource, &irq);
+				     i2c_acpi_add_irq_resource, &irq_ctx);
 	if (ret < 0)
 		return ret;
 
 	acpi_dev_free_resource_list(&resource_list);
 
-	if (irq == -ENOENT)
-		irq = acpi_dev_gpio_irq_get(adev, 0);
+	if (irq_ctx.irq == -ENOENT)
+		irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, 0, &irq_ctx.wake_capable);
+
+	if (irq_ctx.irq < 0)
+		return irq_ctx.irq;
+
+	if (wake_capable)
+		*wake_capable = irq_ctx.wake_capable;
 
-	return irq;
+	return irq_ctx.irq;
 }
 
 static int i2c_acpi_get_info(struct acpi_device *adev,
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 8c7e3494ca5f..b4edf10e8fd0 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -487,7 +487,11 @@ static int i2c_device_probe(struct device *dev)
 			if (irq == -EINVAL || irq == -ENODATA)
 				irq = of_irq_get(dev->of_node, 0);
 		} else if (ACPI_COMPANION(dev)) {
-			irq = i2c_acpi_get_irq(client);
+			bool wake_capable;
+
+			irq = i2c_acpi_get_irq(client, &wake_capable);
+			if (irq > 0 && wake_capable)
+				client->flags |= I2C_CLIENT_WAKE;
 		}
 		if (irq == -EPROBE_DEFER) {
 			status = irq;
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h
index 87e2c914f1c5..1247e6e6e975 100644
--- a/drivers/i2c/i2c-core.h
+++ b/drivers/i2c/i2c-core.h
@@ -61,11 +61,11 @@ static inline int __i2c_check_suspended(struct i2c_adapter *adap)
 #ifdef CONFIG_ACPI
 void i2c_acpi_register_devices(struct i2c_adapter *adap);
 
-int i2c_acpi_get_irq(struct i2c_client *client);
+int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable);
 #else /* CONFIG_ACPI */
 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
 
-static inline int i2c_acpi_get_irq(struct i2c_client *client)
+static inline int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable)
 {
 	return 0;
 }
diff --git a/drivers/platform/x86/intel/int3472/tps68470.c b/drivers/platform/x86/intel/int3472/tps68470.c
index f83e9c393f31..5b8d1a9620a5 100644
--- a/drivers/platform/x86/intel/int3472/tps68470.c
+++ b/drivers/platform/x86/intel/int3472/tps68470.c
@@ -128,15 +128,15 @@ skl_int3472_fill_clk_pdata(struct device *dev, struct tps68470_clk_platform_data
 	for_each_acpi_consumer_dev(adev, consumer) {
 		sensor_name = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
 					     acpi_dev_name(consumer));
-		if (!sensor_name)
+		if (!sensor_name) {
+			acpi_dev_put(consumer);
 			return -ENOMEM;
+		}
 
 		(*clk_pdata)->consumers[i].consumer_dev_name = sensor_name;
 		i++;
 	}
 
-	acpi_dev_put(consumer);
-
 	return n_consumers;
 }
 
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index da78dc77aed3..4f05f610391b 100644
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -206,7 +206,8 @@ static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
 		if (i >= 0) {
 			flags = acpi_dev_irq_flags(gpio->triggering,
 						   gpio->polarity,
-						   gpio->shareable);
+						   gpio->shareable,
+						   gpio->wake_capable);
 		} else {
 			flags = IORESOURCE_DISABLED;
 		}
@@ -315,7 +316,7 @@ static __init void pnpacpi_parse_irq_option(struct pnp_dev *dev,
 		if (p->interrupts[i])
 			__set_bit(p->interrupts[i], map.bits);
 
-	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable);
+	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
 	pnp_register_irq_resource(dev, option_flags, &map, flags);
 }
 
@@ -339,7 +340,7 @@ static __init void pnpacpi_parse_ext_irq_option(struct pnp_dev *dev,
 		}
 	}
 
-	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable);
+	flags = acpi_dev_irq_flags(p->triggering, p->polarity, p->shareable, p->wake_capable);
 	pnp_register_irq_resource(dev, option_flags, &map, flags);
 }
 
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 729cff1ee3f8..3015235d65e3 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -498,7 +498,7 @@ bool acpi_dev_resource_address_space(struct acpi_resource *ares,
 				     struct resource_win *win);
 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
 					 struct resource_win *win);
-unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable);
+unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable, u8 wake_capable);
 unsigned int acpi_dev_get_irq_type(int triggering, int polarity);
 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 				 struct resource *res);
@@ -1211,7 +1211,8 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 				struct acpi_resource_gpio **agpio);
 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
 			       struct acpi_resource_gpio **agpio);
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
+int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
+				  bool *wake_capable);
 #else
 static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 					      struct acpi_resource_gpio **agpio)
@@ -1223,16 +1224,28 @@ static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
 {
 	return false;
 }
-static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
-					   const char *name, int index)
+static inline int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name,
+						int index, bool *wake_capable)
 {
 	return -ENXIO;
 }
 #endif
 
+static inline int acpi_dev_gpio_irq_wake_get(struct acpi_device *adev, int index,
+					     bool *wake_capable)
+{
+	return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, wake_capable);
+}
+
+static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name,
+					   int index)
+{
+	return acpi_dev_gpio_irq_wake_get_by(adev, name, index, NULL);
+}
+
 static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 {
-	return acpi_dev_gpio_irq_get_by(adev, NULL, index);
+	return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, NULL);
 }
 
 /* Device properties */
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 8a76dca9deee..27642ca15d93 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -79,7 +79,8 @@ struct resource {
 #define IORESOURCE_IRQ_HIGHLEVEL	(1<<2)
 #define IORESOURCE_IRQ_LOWLEVEL		(1<<3)
 #define IORESOURCE_IRQ_SHAREABLE	(1<<4)
-#define IORESOURCE_IRQ_OPTIONAL 	(1<<5)
+#define IORESOURCE_IRQ_OPTIONAL		(1<<5)
+#define IORESOURCE_IRQ_WAKECAPABLE	(1<<6)
 
 /* PnP DMA specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_DMA_TYPE_MASK	(3<<0)
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index e5d9ef886179..2b6bb593be5b 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -106,6 +106,14 @@ enum sys_off_mode {
 	SYS_OFF_MODE_POWER_OFF,
 
 	/**
+	 * @SYS_OFF_MODE_RESTART_PREPARE:
+	 *
+	 * Handlers prepare system to be restarted. Handlers are
+	 * allowed to sleep.
+	 */
+	SYS_OFF_MODE_RESTART_PREPARE,
+
+	/**
 	 * @SYS_OFF_MODE_RESTART:
 	 *
 	 * Handlers restart system. Handlers are disallowed to sleep.
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 3c35445bf5ad..3bba88c7ffc6 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -243,6 +243,17 @@ void migrate_to_reboot_cpu(void)
 	set_cpus_allowed_ptr(current, cpumask_of(cpu));
 }
 
+/*
+ *	Notifier list for kernel code which wants to be called
+ *	to prepare system for restart.
+ */
+static BLOCKING_NOTIFIER_HEAD(restart_prep_handler_list);
+
+static void do_kernel_restart_prepare(void)
+{
+	blocking_notifier_call_chain(&restart_prep_handler_list, 0, NULL);
+}
+
 /**
  *	kernel_restart - reboot the system
  *	@cmd: pointer to buffer containing command to execute for restart
@@ -254,6 +265,7 @@ void migrate_to_reboot_cpu(void)
 void kernel_restart(char *cmd)
 {
 	kernel_restart_prepare(cmd);
+	do_kernel_restart_prepare();
 	migrate_to_reboot_cpu();
 	syscore_shutdown();
 	if (!cmd)
@@ -396,6 +408,11 @@ register_sys_off_handler(enum sys_off_mode mode,
 		handler->list = &power_off_handler_list;
 		break;
 
+	case SYS_OFF_MODE_RESTART_PREPARE:
+		handler->list = &restart_prep_handler_list;
+		handler->blocking = true;
+		break;
+
 	case SYS_OFF_MODE_RESTART:
 		handler->list = &restart_handler_list;
 		break;