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path: root/drivers/acpi/acpica/nsalloc.c
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Diffstat (limited to 'drivers/acpi/acpica/nsalloc.c')
-rw-r--r--drivers/acpi/acpica/nsalloc.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/acpi/acpica/nsalloc.c b/drivers/acpi/acpica/nsalloc.c
index 243737363fb8..fd1ff54cda19 100644
--- a/drivers/acpi/acpica/nsalloc.c
+++ b/drivers/acpi/acpica/nsalloc.c
@@ -106,6 +106,7 @@ struct acpi_namespace_node *acpi_ns_create_node(u32 name)
void acpi_ns_delete_node(struct acpi_namespace_node *node)
{
union acpi_operand_object *obj_desc;
+ union acpi_operand_object *next_desc;
ACPI_FUNCTION_NAME(ns_delete_node);
@@ -114,12 +115,13 @@ void acpi_ns_delete_node(struct acpi_namespace_node *node)
acpi_ns_detach_object(node);
/*
- * Delete an attached data object if present (an object that was created
- * and attached via acpi_attach_data). Note: After any normal object is
- * detached above, the only possible remaining object is a data object.
+ * Delete an attached data object list if present (objects that were
+ * attached via acpi_attach_data). Note: After any normal object is
+ * detached above, the only possible remaining object(s) are data
+ * objects, in a linked list.
*/
obj_desc = node->object;
- if (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
+ while (obj_desc && (obj_desc->common.type == ACPI_TYPE_LOCAL_DATA)) {
/* Invoke the attached data deletion handler if present */
@@ -127,7 +129,15 @@ void acpi_ns_delete_node(struct acpi_namespace_node *node)
obj_desc->data.handler(node, obj_desc->data.pointer);
}
+ next_desc = obj_desc->common.next_object;
acpi_ut_remove_reference(obj_desc);
+ obj_desc = next_desc;
+ }
+
+ /* Special case for the statically allocated root node */
+
+ if (node == acpi_gbl_root_node) {
+ return;
}
/* Now we can delete the node */
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-19 08:45:27 +0000
n163' href='#n163'>163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 
/*
 * nvs.c - Routines for saving and restoring ACPI NVS memory region
 *
 * Copyright (C) 2008-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 *
 * This file is released under the GPLv2.
 */

#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/acpi_io.h>
#include <acpi/acpiosxf.h>

/* ACPI NVS regions, APEI may use it */

struct nvs_region {
	__u64 phys_start;
	__u64 size;
	struct list_head node;
};

static LIST_HEAD(nvs_region_list);

#ifdef CONFIG_ACPI_SLEEP
static int suspend_nvs_register(unsigned long start, unsigned long size);
#else
static inline int suspend_nvs_register(unsigned long a, unsigned long b)
{
	return 0;
}
#endif

int acpi_nvs_register(__u64 start, __u64 size)
{
	struct nvs_region *region;

	region = kmalloc(sizeof(*region), GFP_KERNEL);
	if (!region)
		return -ENOMEM;
	region->phys_start = start;
	region->size = size;
	list_add_tail(&region->node, &nvs_region_list);

	return suspend_nvs_register(start, size);
}

int acpi_nvs_for_each_region(int (*func)(__u64 start, __u64 size, void *data),
			     void *data)
{
	int rc;
	struct nvs_region *region;

	list_for_each_entry(region, &nvs_region_list, node) {
		rc = func(region->phys_start, region->size, data);
		if (rc)
			return rc;
	}

	return 0;
}


#ifdef CONFIG_ACPI_SLEEP
/*
 * Platforms, like ACPI, may want us to save some memory used by them during
 * suspend and to restore the contents of this memory during the subsequent
 * resume.  The code below implements a mechanism allowing us to do that.
 */

struct nvs_page {
	unsigned long phys_start;
	unsigned int size;
	void *kaddr;
	void *data;
	bool unmap;
	struct list_head node;
};

static LIST_HEAD(nvs_list);

/**
 *	suspend_nvs_register - register platform NVS memory region to save
 *	@start - physical address of the region
 *	@size - size of the region
 *
 *	The NVS region need not be page-aligned (both ends) and we arrange
 *	things so that the data from page-aligned addresses in this region will
 *	be copied into separate RAM pages.
 */
static int suspend_nvs_register(unsigned long start, unsigned long size)
{
	struct nvs_page *entry, *next;

	pr_info("PM: Registering ACPI NVS region [mem %#010lx-%#010lx] (%ld bytes)\n",
		start, start + size - 1, size);

	while (size > 0) {
		unsigned int nr_bytes;

		entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);
		if (!entry)
			goto Error;

		list_add_tail(&entry->node, &nvs_list);
		entry->phys_start = start;
		nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);
		entry->size = (size < nr_bytes) ? size : nr_bytes;

		start += entry->size;
		size -= entry->size;
	}
	return 0;

 Error:
	list_for_each_entry_safe(entry, next, &nvs_list, node) {
		list_del(&entry->node);
		kfree(entry);
	}
	return -ENOMEM;
}

/**
 *	suspend_nvs_free - free data pages allocated for saving NVS regions
 */
void suspend_nvs_free(void)
{
	struct nvs_page *entry;

	list_for_each_entry(entry, &nvs_list, node)
		if (entry->data) {
			free_page((unsigned long)entry->data);
			entry->data = NULL;
			if (entry->kaddr) {
				if (entry->unmap) {
					iounmap(entry->kaddr);
					entry->unmap = false;
				} else {
					acpi_os_unmap_memory(entry->kaddr,
							     entry->size);
				}
				entry->kaddr = NULL;
			}
		}
}

/**
 *	suspend_nvs_alloc - allocate memory necessary for saving NVS regions
 */
int suspend_nvs_alloc(void)
{
	struct nvs_page *entry;

	list_for_each_entry(entry, &nvs_list, node) {
		entry->data = (void *)__get_free_page(GFP_KERNEL);
		if (!entry->data) {
			suspend_nvs_free();
			return -ENOMEM;
		}
	}
	return 0;
}

/**
 *	suspend_nvs_save - save NVS memory regions
 */
int suspend_nvs_save(void)
{
	struct nvs_page *entry;

	printk(KERN_INFO "PM: Saving platform NVS memory\n");

	list_for_each_entry(entry, &nvs_list, node)
		if (entry->data) {
			unsigned long phys = entry->phys_start;
			unsigned int size = entry->size;

			entry->kaddr = acpi_os_get_iomem(phys, size);
			if (!entry->kaddr) {
				entry->kaddr = acpi_os_ioremap(phys, size);
				entry->unmap = !!entry->kaddr;
			}
			if (!entry->kaddr) {
				suspend_nvs_free();
				return -ENOMEM;
			}
			memcpy(entry->data, entry->kaddr, entry->size);
		}

	return 0;
}

/**
 *	suspend_nvs_restore - restore NVS memory regions
 *
 *	This function is going to be called with interrupts disabled, so it
 *	cannot iounmap the virtual addresses used to access the NVS region.
 */
void suspend_nvs_restore(void)
{
	struct nvs_page *entry;

	printk(KERN_INFO "PM: Restoring platform NVS memory\n");

	list_for_each_entry(entry, &nvs_list, node)
		if (entry->data)
			memcpy(entry->kaddr, entry->data, entry->size);
}
#endif