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-rw-r--r--drivers/acpi/apei/ghes.c2
-rw-r--r--drivers/acpi/device_pm.c15
-rw-r--r--drivers/acpi/irq.c8
-rw-r--r--drivers/acpi/resource.c16
-rw-r--r--drivers/acpi/sleep.c8
-rw-r--r--drivers/gpio/gpiolib-acpi.c15
-rw-r--r--drivers/gpio/gpiolib-acpi.h2
-rw-r--r--drivers/i2c/i2c-core-acpi.c40
-rw-r--r--drivers/i2c/i2c-core-base.c6
-rw-r--r--drivers/i2c/i2c-core.h4
-rw-r--r--drivers/platform/x86/intel/int3472/tps68470.c6
-rw-r--r--drivers/pnp/pnpacpi/rsparser.c7
-rw-r--r--include/linux/acpi.h23
-rw-r--r--include/linux/ioport.h3
-rw-r--r--include/linux/reboot.h8
-rw-r--r--kernel/reboot.c17
16 files changed, 143 insertions, 37 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/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 9be1376f9a62..1f2ade475b36 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -741,6 +741,7 @@ 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
@@ -987,10 +988,11 @@ 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
@@ -1002,9 +1004,13 @@ 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;
@@ -1061,13 +1067,16 @@ 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 08b561f0709d..f88386d732d2 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 91007558bcb2..fc4b85fb90b1 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 49fc379fe680..62093fde187f 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 2f9193b8dfc1..83a4ffbbbfd6 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);
@@ -1210,7 +1210,8 @@ 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)
@@ -1222,16 +1223,28 @@ 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 616b683563a9..3baeea4d903b 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;
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