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Commit 7bc583d1 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'acpi-hotplug' 

* acpi-hotplug:
  ACPI / hotplug: Remove containers synchronously
  driver core / ACPI: Avoid device hot remove locking issues
parents da48afb2 f943db40

drivers/acpi/scan.c

+15 −34
Original line number Diff line number Diff line
@@ -287,6 +287,7 @@ static void acpi_bus_device_eject(void *context) 
	struct acpi_device *device = NULL;

	struct acpi_scan_handler *handler;

	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;

	int error;



	mutex_lock(&acpi_scan_lock);
@@ -301,17 +302,13 @@ static void acpi_bus_device_eject(void *context) 
	}

	acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,

				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);

	if (handler->hotplug.mode == AHM_CONTAINER) {

		device->flags.eject_pending = true;

	if (handler->hotplug.mode == AHM_CONTAINER)

		kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);

	} else {

		int error;



	get_device(&device->dev);

	error = acpi_scan_hot_remove(device);

	if (error)

		goto err_out;

	}



 out:

	mutex_unlock(&acpi_scan_lock);
@@ -496,7 +493,6 @@ acpi_eject_store(struct device *d, struct device_attribute *attr, 
	struct acpi_eject_event *ej_event;

	acpi_object_type not_used;

	acpi_status status;

	u32 ost_source;

	int ret;



	if (!count || buf[0] != '1')
@@ -510,43 +506,28 @@ acpi_eject_store(struct device *d, struct device_attribute *attr, 
	if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)

		return -ENODEV;



	mutex_lock(&acpi_scan_lock);



	if (acpi_device->flags.eject_pending) {

		/* ACPI eject notification event. */

		ost_source = ACPI_NOTIFY_EJECT_REQUEST;

		acpi_device->flags.eject_pending = 0;

	} else {

		/* Eject initiated by user space. */

		ost_source = ACPI_OST_EC_OSPM_EJECT;

	}

	ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);

	if (!ej_event) {

		ret = -ENOMEM;

		goto err_out;

	}

	acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,

	acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,

				  ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);

	ej_event->device = acpi_device;

	ej_event->event = ost_source;

	ej_event->event = ACPI_OST_EC_OSPM_EJECT;

	get_device(&acpi_device->dev);

	status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);

	if (ACPI_FAILURE(status)) {

	if (ACPI_SUCCESS(status))

		return count;



	put_device(&acpi_device->dev);

	kfree(ej_event);

	ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;

		goto err_out;

	}

	ret = count;



 out:

	mutex_unlock(&acpi_scan_lock);

	return ret;



 err_out:

	acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,

	acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,

				  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);

	goto out;

	return ret;

}



static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);

drivers/base/core.c

+28 −15
Original line number Diff line number Diff line
@@ -49,6 +49,28 @@ static struct kobject *dev_kobj; 
struct kobject *sysfs_dev_char_kobj;

struct kobject *sysfs_dev_block_kobj;



static DEFINE_MUTEX(device_hotplug_lock);



void lock_device_hotplug(void)

{

	mutex_lock(&device_hotplug_lock);

}



void unlock_device_hotplug(void)

{

	mutex_unlock(&device_hotplug_lock);

}



int lock_device_hotplug_sysfs(void)

{

	if (mutex_trylock(&device_hotplug_lock))

		return 0;



	/* Avoid busy looping (5 ms of sleep should do). */

	msleep(5);

	return restart_syscall();

}



#ifdef CONFIG_BLOCK

static inline int device_is_not_partition(struct device *dev)

{
@@ -408,9 +430,9 @@ static ssize_t show_online(struct device *dev, struct device_attribute *attr, 
{

	bool val;



	lock_device_hotplug();

	device_lock(dev);

	val = !dev->offline;

	unlock_device_hotplug();

	device_unlock(dev);

	return sprintf(buf, "%u\n", val);

}
@@ -424,7 +446,10 @@ static ssize_t store_online(struct device *dev, struct device_attribute *attr, 
	if (ret < 0)

		return ret;



	lock_device_hotplug();

	ret = lock_device_hotplug_sysfs();

	if (ret)

		return ret;



	ret = val ? device_online(dev) : device_offline(dev);

	unlock_device_hotplug();

	return ret < 0 ? ret : count;
@@ -1479,18 +1504,6 @@ EXPORT_SYMBOL_GPL(put_device); 
EXPORT_SYMBOL_GPL(device_create_file);

EXPORT_SYMBOL_GPL(device_remove_file);



static DEFINE_MUTEX(device_hotplug_lock);



void lock_device_hotplug(void)

{

	mutex_lock(&device_hotplug_lock);

}



void unlock_device_hotplug(void)

{

	mutex_unlock(&device_hotplug_lock);

}



static int device_check_offline(struct device *dev, void *not_used)

{

	int ret;

drivers/base/memory.c

+3 −1
Original line number Diff line number Diff line
@@ -351,7 +351,9 @@ store_mem_state(struct device *dev, 


	mem = container_of(dev, struct memory_block, dev);



	lock_device_hotplug();

	ret = lock_device_hotplug_sysfs();

	if (ret)

		return ret;



	if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) {

		offline = false;

include/acpi/acpi_bus.h

+1 −2
Original line number Diff line number Diff line
@@ -167,9 +167,8 @@ struct acpi_device_flags { 
	u32 removable:1;

	u32 ejectable:1;

	u32 power_manageable:1;

	u32 eject_pending:1;

	u32 match_driver:1;

	u32 reserved:26;

	u32 reserved:27;

};



/* File System */

include/linux/device.h

+1 −0
Original line number Diff line number Diff line
@@ -895,6 +895,7 @@ static inline bool device_supports_offline(struct device *dev) 


extern void lock_device_hotplug(void);

extern void unlock_device_hotplug(void);

extern int lock_device_hotplug_sysfs(void);

extern int device_offline(struct device *dev);

extern int device_online(struct device *dev);

/*