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Commit 85fb0a1c authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'acpi-hotplug' 

* acpi-hotplug:
  PM / hibernate / memory hotplug: Rework mutual exclusion
  PM / hibernate: Create memory bitmaps after freezing user space
  ACPI / scan: Change ordering of locks for device hotplug
parents a9238741 942f4015

drivers/acpi/scan.c

+6 −9
Original line number Diff line number Diff line
@@ -204,8 +204,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device) 
		return -EINVAL;

	}



	lock_device_hotplug();



	/*

	 * Carry out two passes here and ignore errors in the first pass,

	 * because if the devices in question are memory blocks and
@@ -236,9 +234,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device) 
					    ACPI_UINT32_MAX,

					    acpi_bus_online_companions, NULL,

					    NULL, NULL);



			unlock_device_hotplug();



			put_device(&device->dev);

			return -EBUSY;

		}
@@ -249,8 +244,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device) 


	acpi_bus_trim(device);



	unlock_device_hotplug();



	/* Device node has been unregistered. */

	put_device(&device->dev);

	device = NULL;
@@ -289,6 +282,7 @@ static void acpi_bus_device_eject(void *context) 
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;

	int error;



	lock_device_hotplug();

	mutex_lock(&acpi_scan_lock);



	acpi_bus_get_device(handle, &device);
@@ -312,6 +306,7 @@ static void acpi_bus_device_eject(void *context) 


 out:

	mutex_unlock(&acpi_scan_lock);

	unlock_device_hotplug();

	return;



 err_out:
@@ -326,8 +321,8 @@ static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source) 
	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;

	int error;



	mutex_lock(&acpi_scan_lock);

	lock_device_hotplug();

	mutex_lock(&acpi_scan_lock);



	if (ost_source != ACPI_NOTIFY_BUS_CHECK) {

		acpi_bus_get_device(handle, &device);
@@ -353,9 +348,9 @@ static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source) 
		kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);



 out:

	unlock_device_hotplug();

	acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);

	mutex_unlock(&acpi_scan_lock);

	unlock_device_hotplug();

}



static void acpi_scan_bus_check(void *context)
@@ -446,6 +441,7 @@ void acpi_bus_hot_remove_device(void *context) 
	acpi_handle handle = device->handle;

	int error;



	lock_device_hotplug();

	mutex_lock(&acpi_scan_lock);



	error = acpi_scan_hot_remove(device);
@@ -455,6 +451,7 @@ void acpi_bus_hot_remove_device(void *context) 
					  NULL);



	mutex_unlock(&acpi_scan_lock);

	unlock_device_hotplug();

	kfree(context);

}

EXPORT_SYMBOL(acpi_bus_hot_remove_device);

kernel/power/hibernate.c

+23 −22
Original line number Diff line number Diff line
@@ -644,22 +644,23 @@ int hibernate(void) 
	if (error)

		goto Exit;



	/* Allocate memory management structures */

	error = create_basic_memory_bitmaps();

	if (error)

		goto Exit;



	printk(KERN_INFO "PM: Syncing filesystems ... ");

	sys_sync();

	printk("done.\n");



	error = freeze_processes();

	if (error)

		goto Free_bitmaps;

		goto Exit;



	lock_device_hotplug();

	/* Allocate memory management structures */

	error = create_basic_memory_bitmaps();

	if (error)

		goto Thaw;



	error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);

	if (error || freezer_test_done)

		goto Thaw;

		goto Free_bitmaps;



	if (in_suspend) {

		unsigned int flags = 0;
@@ -682,14 +683,14 @@ int hibernate(void) 
		pr_debug("PM: Image restored successfully.\n");

	}



 Free_bitmaps:

	free_basic_memory_bitmaps();

 Thaw:

	unlock_device_hotplug();

	thaw_processes();



	/* Don't bother checking whether freezer_test_done is true */

	freezer_test_done = false;



 Free_bitmaps:

	free_basic_memory_bitmaps();

 Exit:

	pm_notifier_call_chain(PM_POST_HIBERNATION);

	pm_restore_console();
@@ -806,21 +807,20 @@ static int software_resume(void) 
	pm_prepare_console();

	error = pm_notifier_call_chain(PM_RESTORE_PREPARE);

	if (error)

		goto close_finish;



	error = create_basic_memory_bitmaps();

	if (error)

		goto close_finish;

		goto Close_Finish;



	pr_debug("PM: Preparing processes for restore.\n");

	error = freeze_processes();

	if (error) {

		swsusp_close(FMODE_READ);

		goto Done;

	}

	if (error)

		goto Close_Finish;



	pr_debug("PM: Loading hibernation image.\n");



	lock_device_hotplug();

	error = create_basic_memory_bitmaps();

	if (error)

		goto Thaw;



	error = swsusp_read(&flags);

	swsusp_close(FMODE_READ);

	if (!error)
@@ -828,9 +828,10 @@ static int software_resume(void) 


	printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");

	swsusp_free();

	thaw_processes();

 Done:

	free_basic_memory_bitmaps();

 Thaw:

	unlock_device_hotplug();

	thaw_processes();

 Finish:

	pm_notifier_call_chain(PM_POST_RESTORE);

	pm_restore_console();
@@ -840,7 +841,7 @@ static int software_resume(void) 
	mutex_unlock(&pm_mutex);

	pr_debug("PM: Hibernation image not present or could not be loaded.\n");

	return error;

close_finish:

 Close_Finish:

	swsusp_close(FMODE_READ);

	goto Finish;

}

kernel/power/user.c

+14 −10
Original line number Diff line number Diff line
@@ -60,11 +60,6 @@ static int snapshot_open(struct inode *inode, struct file *filp) 
		error = -ENOSYS;

		goto Unlock;

	}

	if(create_basic_memory_bitmaps()) {

		atomic_inc(&snapshot_device_available);

		error = -ENOMEM;

		goto Unlock;

	}

	nonseekable_open(inode, filp);

	data = &snapshot_state;

	filp->private_data = data;
@@ -90,10 +85,9 @@ static int snapshot_open(struct inode *inode, struct file *filp) 
		if (error)

			pm_notifier_call_chain(PM_POST_RESTORE);

	}

	if (error) {

		free_basic_memory_bitmaps();

	if (error)

		atomic_inc(&snapshot_device_available);

	}



	data->frozen = 0;

	data->ready = 0;

	data->platform_support = 0;
@@ -111,11 +105,11 @@ static int snapshot_release(struct inode *inode, struct file *filp) 
	lock_system_sleep();



	swsusp_free();

	free_basic_memory_bitmaps();

	data = filp->private_data;

	free_all_swap_pages(data->swap);

	if (data->frozen) {

		pm_restore_gfp_mask();

		free_basic_memory_bitmaps();

		thaw_processes();

	}

	pm_notifier_call_chain(data->mode == O_RDONLY ?
@@ -207,6 +201,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, 
	if (!mutex_trylock(&pm_mutex))

		return -EBUSY;



	lock_device_hotplug();

	data = filp->private_data;



	switch (cmd) {
@@ -220,14 +215,22 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, 
		printk("done.\n");



		error = freeze_processes();

		if (!error)

		if (error)

			break;



		error = create_basic_memory_bitmaps();

		if (error)

			thaw_processes();

		else

			data->frozen = 1;



		break;



	case SNAPSHOT_UNFREEZE:

		if (!data->frozen || data->ready)

			break;

		pm_restore_gfp_mask();

		free_basic_memory_bitmaps();

		thaw_processes();

		data->frozen = 0;

		break;
@@ -371,6 +374,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, 


	}



	unlock_device_hotplug();

	mutex_unlock(&pm_mutex);



	return error;

mm/memory_hotplug.c

+0 −4
Original line number Diff line number Diff line
@@ -51,14 +51,10 @@ DEFINE_MUTEX(mem_hotplug_mutex); 
void lock_memory_hotplug(void)

{

	mutex_lock(&mem_hotplug_mutex);



	/* for exclusive hibernation if CONFIG_HIBERNATION=y */

	lock_system_sleep();

}



void unlock_memory_hotplug(void)

{

	unlock_system_sleep();

	mutex_unlock(&mem_hotplug_mutex);

}