![Rafael J. Wysocki](/assets/img/avatar_default.png)
Move some duplicated code from acpi_bind_one() and acpi_unbind_one() into a separate function and make that function use snprintf() instead of sprintf() for extra safety. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
380 lines
8.6 KiB
C
380 lines
8.6 KiB
C
/*
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* Link physical devices with ACPI devices support
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*
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* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2005 Intel Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/rwsem.h>
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#include <linux/acpi.h>
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#include "internal.h"
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#define ACPI_GLUE_DEBUG 0
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#if ACPI_GLUE_DEBUG
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#define DBG(fmt, ...) \
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printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
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#else
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#define DBG(fmt, ...) \
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do { \
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if (0) \
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printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
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} while (0)
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#endif
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static LIST_HEAD(bus_type_list);
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static DECLARE_RWSEM(bus_type_sem);
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#define PHYSICAL_NODE_STRING "physical_node"
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#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
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int register_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return -ENODEV;
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if (type && type->match && type->find_device) {
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down_write(&bus_type_sem);
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list_add_tail(&type->list, &bus_type_list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(register_acpi_bus_type);
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int unregister_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return 0;
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if (type) {
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down_write(&bus_type_sem);
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list_del_init(&type->list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s unregistered\n",
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type->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
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static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
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{
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struct acpi_bus_type *tmp, *ret = NULL;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->match(dev)) {
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ret = tmp;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used,
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void *not_used, void **ret_p)
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{
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struct acpi_device *adev = NULL;
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acpi_bus_get_device(handle, &adev);
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if (adev) {
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*ret_p = handle;
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return AE_CTRL_TERMINATE;
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}
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return AE_OK;
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}
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static bool acpi_extra_checks_passed(acpi_handle handle, bool is_bridge)
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{
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unsigned long long sta;
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acpi_status status;
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status = acpi_bus_get_status_handle(handle, &sta);
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if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
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return false;
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if (is_bridge) {
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void *test = NULL;
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/* Check if this object has at least one child device. */
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
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acpi_dev_present, NULL, NULL, &test);
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return !!test;
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}
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return true;
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}
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struct find_child_context {
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u64 addr;
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bool is_bridge;
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acpi_handle ret;
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bool ret_checked;
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};
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static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
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void *data, void **not_used)
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{
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struct find_child_context *context = data;
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unsigned long long addr;
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acpi_status status;
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status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
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if (ACPI_FAILURE(status) || addr != context->addr)
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return AE_OK;
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if (!context->ret) {
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/* This is the first matching object. Save its handle. */
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context->ret = handle;
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return AE_OK;
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}
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/*
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* There is more than one matching object with the same _ADR value.
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* That really is unexpected, so we are kind of beyond the scope of the
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* spec here. We have to choose which one to return, though.
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*
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* First, check if the previously found object is good enough and return
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* its handle if so. Second, check the same for the object that we've
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* just found.
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*/
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if (!context->ret_checked) {
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if (acpi_extra_checks_passed(context->ret, context->is_bridge))
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return AE_CTRL_TERMINATE;
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else
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context->ret_checked = true;
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}
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if (acpi_extra_checks_passed(handle, context->is_bridge)) {
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context->ret = handle;
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return AE_CTRL_TERMINATE;
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}
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return AE_OK;
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}
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acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge)
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{
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if (parent) {
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struct find_child_context context = {
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.addr = addr,
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.is_bridge = is_bridge,
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};
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acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child,
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NULL, &context, NULL);
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return context.ret;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(acpi_find_child);
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static void acpi_physnode_link_name(char *buf, unsigned int node_id)
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{
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if (node_id > 0)
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snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
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PHYSICAL_NODE_STRING "%u", node_id);
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else
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strcpy(buf, PHYSICAL_NODE_STRING);
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}
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int acpi_bind_one(struct device *dev, acpi_handle handle)
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{
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struct acpi_device *acpi_dev;
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acpi_status status;
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struct acpi_device_physical_node *physical_node, *pn;
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char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
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struct list_head *physnode_list;
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unsigned int node_id;
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int retval = -EINVAL;
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if (ACPI_HANDLE(dev)) {
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if (handle) {
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dev_warn(dev, "ACPI handle is already set\n");
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return -EINVAL;
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} else {
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handle = ACPI_HANDLE(dev);
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}
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}
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if (!handle)
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return -EINVAL;
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get_device(dev);
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status = acpi_bus_get_device(handle, &acpi_dev);
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if (ACPI_FAILURE(status))
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goto err;
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physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
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if (!physical_node) {
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retval = -ENOMEM;
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goto err;
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}
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mutex_lock(&acpi_dev->physical_node_lock);
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/*
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* Keep the list sorted by node_id so that the IDs of removed nodes can
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* be recycled easily.
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*/
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physnode_list = &acpi_dev->physical_node_list;
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node_id = 0;
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list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
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/* Sanity check. */
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if (pn->dev == dev) {
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dev_warn(dev, "Already associated with ACPI node\n");
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if (ACPI_HANDLE(dev) == handle)
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retval = 0;
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goto out_free;
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}
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if (pn->node_id == node_id) {
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physnode_list = &pn->node;
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node_id++;
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}
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}
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physical_node->node_id = node_id;
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physical_node->dev = dev;
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list_add(&physical_node->node, physnode_list);
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acpi_dev->physical_node_count++;
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mutex_unlock(&acpi_dev->physical_node_lock);
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if (!ACPI_HANDLE(dev))
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ACPI_HANDLE_SET(dev, acpi_dev->handle);
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acpi_physnode_link_name(physical_node_name, node_id);
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retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
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physical_node_name);
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retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
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"firmware_node");
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if (acpi_dev->wakeup.flags.valid)
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device_set_wakeup_capable(dev, true);
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return 0;
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err:
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ACPI_HANDLE_SET(dev, NULL);
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put_device(dev);
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return retval;
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out_free:
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mutex_unlock(&acpi_dev->physical_node_lock);
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kfree(physical_node);
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if (retval)
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goto err;
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put_device(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_bind_one);
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int acpi_unbind_one(struct device *dev)
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{
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struct acpi_device_physical_node *entry;
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struct acpi_device *acpi_dev;
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acpi_status status;
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struct list_head *node, *next;
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if (!ACPI_HANDLE(dev))
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return 0;
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status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
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if (ACPI_FAILURE(status))
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goto err;
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mutex_lock(&acpi_dev->physical_node_lock);
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list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
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char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
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entry = list_entry(node, struct acpi_device_physical_node,
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node);
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if (entry->dev != dev)
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continue;
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list_del(node);
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acpi_dev->physical_node_count--;
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acpi_physnode_link_name(physical_node_name, entry->node_id);
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sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
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sysfs_remove_link(&dev->kobj, "firmware_node");
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ACPI_HANDLE_SET(dev, NULL);
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/* acpi_bind_one increase refcnt by one */
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put_device(dev);
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kfree(entry);
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}
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mutex_unlock(&acpi_dev->physical_node_lock);
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return 0;
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err:
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dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(acpi_unbind_one);
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static int acpi_platform_notify(struct device *dev)
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{
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struct acpi_bus_type *type = acpi_get_bus_type(dev);
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acpi_handle handle;
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int ret;
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ret = acpi_bind_one(dev, NULL);
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if (ret && type) {
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ret = type->find_device(dev, &handle);
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if (ret) {
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DBG("Unable to get handle for %s\n", dev_name(dev));
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goto out;
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}
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ret = acpi_bind_one(dev, handle);
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if (ret)
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goto out;
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}
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if (type && type->setup)
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type->setup(dev);
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out:
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#if ACPI_GLUE_DEBUG
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if (!ret) {
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
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DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
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kfree(buffer.pointer);
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} else
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DBG("Device %s -> No ACPI support\n", dev_name(dev));
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#endif
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return ret;
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}
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static int acpi_platform_notify_remove(struct device *dev)
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{
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struct acpi_bus_type *type;
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type = acpi_get_bus_type(dev);
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if (type && type->cleanup)
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type->cleanup(dev);
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acpi_unbind_one(dev);
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return 0;
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}
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int __init init_acpi_device_notify(void)
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{
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if (platform_notify || platform_notify_remove) {
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printk(KERN_ERR PREFIX "Can't use platform_notify\n");
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return 0;
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}
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platform_notify = acpi_platform_notify;
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platform_notify_remove = acpi_platform_notify_remove;
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return 0;
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}
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