![Heikki Krogerus](/assets/img/avatar_default.png)
The software node is searched from a list that may be empty
when the function is called. This makes sure that the
function returns NULL if the list is empty.
Fixes: 1666faedb5
("software node: Add software_node_find_by_name()")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
913 lines
21 KiB
C
913 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Software nodes for the firmware node framework.
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*
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* Copyright (C) 2018, Intel Corporation
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* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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struct swnode {
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int id;
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struct kobject kobj;
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struct fwnode_handle fwnode;
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const struct software_node *node;
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/* hierarchy */
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struct ida child_ids;
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struct list_head entry;
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struct list_head children;
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struct swnode *parent;
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unsigned int allocated:1;
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};
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static DEFINE_IDA(swnode_root_ids);
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static struct kset *swnode_kset;
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#define kobj_to_swnode(_kobj_) container_of(_kobj_, struct swnode, kobj)
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static const struct fwnode_operations software_node_ops;
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bool is_software_node(const struct fwnode_handle *fwnode)
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{
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return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
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}
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EXPORT_SYMBOL_GPL(is_software_node);
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#define to_swnode(__fwnode) \
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({ \
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typeof(__fwnode) __to_swnode_fwnode = __fwnode; \
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\
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is_software_node(__to_swnode_fwnode) ? \
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container_of(__to_swnode_fwnode, \
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struct swnode, fwnode) : NULL; \
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})
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static struct swnode *
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software_node_to_swnode(const struct software_node *node)
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{
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struct swnode *swnode = NULL;
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struct kobject *k;
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if (!node)
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return NULL;
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spin_lock(&swnode_kset->list_lock);
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list_for_each_entry(k, &swnode_kset->list, entry) {
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swnode = kobj_to_swnode(k);
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if (swnode->node == node)
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break;
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swnode = NULL;
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}
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spin_unlock(&swnode_kset->list_lock);
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return swnode;
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}
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const struct software_node *to_software_node(struct fwnode_handle *fwnode)
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{
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struct swnode *swnode = to_swnode(fwnode);
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return swnode ? swnode->node : NULL;
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}
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EXPORT_SYMBOL_GPL(to_software_node);
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struct fwnode_handle *software_node_fwnode(const struct software_node *node)
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{
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struct swnode *swnode = software_node_to_swnode(node);
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return swnode ? &swnode->fwnode : NULL;
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}
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EXPORT_SYMBOL_GPL(software_node_fwnode);
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/* -------------------------------------------------------------------------- */
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/* property_entry processing */
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static const struct property_entry *
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property_entry_get(const struct property_entry *prop, const char *name)
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{
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if (!prop)
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return NULL;
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for (; prop->name; prop++)
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if (!strcmp(name, prop->name))
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return prop;
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return NULL;
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}
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static void
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property_set_pointer(struct property_entry *prop, const void *pointer)
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{
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switch (prop->type) {
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case DEV_PROP_U8:
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if (prop->is_array)
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prop->pointer.u8_data = pointer;
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else
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prop->value.u8_data = *((u8 *)pointer);
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break;
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case DEV_PROP_U16:
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if (prop->is_array)
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prop->pointer.u16_data = pointer;
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else
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prop->value.u16_data = *((u16 *)pointer);
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break;
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case DEV_PROP_U32:
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if (prop->is_array)
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prop->pointer.u32_data = pointer;
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else
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prop->value.u32_data = *((u32 *)pointer);
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break;
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case DEV_PROP_U64:
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if (prop->is_array)
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prop->pointer.u64_data = pointer;
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else
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prop->value.u64_data = *((u64 *)pointer);
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break;
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case DEV_PROP_STRING:
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if (prop->is_array)
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prop->pointer.str = pointer;
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else
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prop->value.str = pointer;
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break;
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default:
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break;
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}
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}
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static const void *property_get_pointer(const struct property_entry *prop)
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{
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switch (prop->type) {
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case DEV_PROP_U8:
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if (prop->is_array)
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return prop->pointer.u8_data;
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return &prop->value.u8_data;
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case DEV_PROP_U16:
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if (prop->is_array)
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return prop->pointer.u16_data;
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return &prop->value.u16_data;
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case DEV_PROP_U32:
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if (prop->is_array)
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return prop->pointer.u32_data;
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return &prop->value.u32_data;
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case DEV_PROP_U64:
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if (prop->is_array)
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return prop->pointer.u64_data;
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return &prop->value.u64_data;
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case DEV_PROP_STRING:
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if (prop->is_array)
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return prop->pointer.str;
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return &prop->value.str;
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default:
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return NULL;
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}
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}
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static const void *property_entry_find(const struct property_entry *props,
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const char *propname, size_t length)
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{
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const struct property_entry *prop;
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const void *pointer;
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prop = property_entry_get(props, propname);
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if (!prop)
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return ERR_PTR(-EINVAL);
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pointer = property_get_pointer(prop);
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if (!pointer)
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return ERR_PTR(-ENODATA);
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if (length > prop->length)
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return ERR_PTR(-EOVERFLOW);
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return pointer;
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}
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static int property_entry_read_u8_array(const struct property_entry *props,
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const char *propname,
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u8 *values, size_t nval)
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{
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const void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = property_entry_find(props, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int property_entry_read_u16_array(const struct property_entry *props,
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const char *propname,
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u16 *values, size_t nval)
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{
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const void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = property_entry_find(props, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int property_entry_read_u32_array(const struct property_entry *props,
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const char *propname,
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u32 *values, size_t nval)
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{
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const void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = property_entry_find(props, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int property_entry_read_u64_array(const struct property_entry *props,
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const char *propname,
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u64 *values, size_t nval)
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{
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const void *pointer;
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size_t length = nval * sizeof(*values);
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pointer = property_entry_find(props, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(values, pointer, length);
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return 0;
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}
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static int
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property_entry_count_elems_of_size(const struct property_entry *props,
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const char *propname, size_t length)
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{
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const struct property_entry *prop;
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prop = property_entry_get(props, propname);
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if (!prop)
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return -EINVAL;
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return prop->length / length;
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}
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static int property_entry_read_int_array(const struct property_entry *props,
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const char *name,
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unsigned int elem_size, void *val,
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size_t nval)
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{
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if (!val)
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return property_entry_count_elems_of_size(props, name,
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elem_size);
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switch (elem_size) {
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case sizeof(u8):
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return property_entry_read_u8_array(props, name, val, nval);
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case sizeof(u16):
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return property_entry_read_u16_array(props, name, val, nval);
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case sizeof(u32):
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return property_entry_read_u32_array(props, name, val, nval);
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case sizeof(u64):
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return property_entry_read_u64_array(props, name, val, nval);
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}
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return -ENXIO;
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}
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static int property_entry_read_string_array(const struct property_entry *props,
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const char *propname,
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const char **strings, size_t nval)
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{
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const struct property_entry *prop;
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const void *pointer;
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size_t array_len, length;
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/* Find out the array length. */
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prop = property_entry_get(props, propname);
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if (!prop)
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return -EINVAL;
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if (prop->is_array)
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/* Find the length of an array. */
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array_len = property_entry_count_elems_of_size(props, propname,
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sizeof(const char *));
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else
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/* The array length for a non-array string property is 1. */
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array_len = 1;
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/* Return how many there are if strings is NULL. */
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if (!strings)
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return array_len;
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array_len = min(nval, array_len);
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length = array_len * sizeof(*strings);
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pointer = property_entry_find(props, propname, length);
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if (IS_ERR(pointer))
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return PTR_ERR(pointer);
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memcpy(strings, pointer, length);
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return array_len;
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}
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static void property_entry_free_data(const struct property_entry *p)
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{
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const void *pointer = property_get_pointer(p);
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size_t i, nval;
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if (p->is_array) {
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if (p->type == DEV_PROP_STRING && p->pointer.str) {
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nval = p->length / sizeof(const char *);
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for (i = 0; i < nval; i++)
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kfree(p->pointer.str[i]);
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}
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kfree(pointer);
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} else if (p->type == DEV_PROP_STRING) {
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kfree(p->value.str);
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}
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kfree(p->name);
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}
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static int property_copy_string_array(struct property_entry *dst,
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const struct property_entry *src)
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{
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const char **d;
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size_t nval = src->length / sizeof(*d);
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int i;
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d = kcalloc(nval, sizeof(*d), GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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for (i = 0; i < nval; i++) {
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d[i] = kstrdup(src->pointer.str[i], GFP_KERNEL);
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if (!d[i] && src->pointer.str[i]) {
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while (--i >= 0)
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kfree(d[i]);
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kfree(d);
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return -ENOMEM;
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}
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}
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dst->pointer.str = d;
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return 0;
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}
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static int property_entry_copy_data(struct property_entry *dst,
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const struct property_entry *src)
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{
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const void *pointer = property_get_pointer(src);
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const void *new;
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int error;
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if (src->is_array) {
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if (!src->length)
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return -ENODATA;
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if (src->type == DEV_PROP_STRING) {
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error = property_copy_string_array(dst, src);
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if (error)
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return error;
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new = dst->pointer.str;
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} else {
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new = kmemdup(pointer, src->length, GFP_KERNEL);
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if (!new)
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return -ENOMEM;
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}
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} else if (src->type == DEV_PROP_STRING) {
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new = kstrdup(src->value.str, GFP_KERNEL);
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if (!new && src->value.str)
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return -ENOMEM;
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} else {
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new = pointer;
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}
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dst->length = src->length;
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dst->is_array = src->is_array;
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dst->type = src->type;
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property_set_pointer(dst, new);
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dst->name = kstrdup(src->name, GFP_KERNEL);
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if (!dst->name)
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goto out_free_data;
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return 0;
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out_free_data:
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property_entry_free_data(dst);
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return -ENOMEM;
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}
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/**
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* property_entries_dup - duplicate array of properties
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* @properties: array of properties to copy
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*
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* This function creates a deep copy of the given NULL-terminated array
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* of property entries.
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*/
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struct property_entry *
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property_entries_dup(const struct property_entry *properties)
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{
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struct property_entry *p;
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int i, n = 0;
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int ret;
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if (!properties)
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return NULL;
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while (properties[n].name)
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n++;
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p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
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if (!p)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < n; i++) {
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ret = property_entry_copy_data(&p[i], &properties[i]);
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if (ret) {
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while (--i >= 0)
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property_entry_free_data(&p[i]);
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kfree(p);
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return ERR_PTR(ret);
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}
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}
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return p;
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}
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EXPORT_SYMBOL_GPL(property_entries_dup);
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/**
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* property_entries_free - free previously allocated array of properties
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* @properties: array of properties to destroy
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*
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* This function frees given NULL-terminated array of property entries,
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* along with their data.
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*/
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void property_entries_free(const struct property_entry *properties)
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{
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const struct property_entry *p;
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if (!properties)
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return;
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for (p = properties; p->name; p++)
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property_entry_free_data(p);
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kfree(properties);
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}
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EXPORT_SYMBOL_GPL(property_entries_free);
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/* -------------------------------------------------------------------------- */
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/* fwnode operations */
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static struct fwnode_handle *software_node_get(struct fwnode_handle *fwnode)
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{
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struct swnode *swnode = to_swnode(fwnode);
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kobject_get(&swnode->kobj);
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return &swnode->fwnode;
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}
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static void software_node_put(struct fwnode_handle *fwnode)
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{
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struct swnode *swnode = to_swnode(fwnode);
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kobject_put(&swnode->kobj);
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}
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static bool software_node_property_present(const struct fwnode_handle *fwnode,
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const char *propname)
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{
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struct swnode *swnode = to_swnode(fwnode);
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return !!property_entry_get(swnode->node->properties, propname);
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}
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static int software_node_read_int_array(const struct fwnode_handle *fwnode,
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const char *propname,
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unsigned int elem_size, void *val,
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size_t nval)
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{
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struct swnode *swnode = to_swnode(fwnode);
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return property_entry_read_int_array(swnode->node->properties, propname,
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elem_size, val, nval);
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}
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static int software_node_read_string_array(const struct fwnode_handle *fwnode,
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const char *propname,
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const char **val, size_t nval)
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{
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struct swnode *swnode = to_swnode(fwnode);
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return property_entry_read_string_array(swnode->node->properties,
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propname, val, nval);
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}
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static struct fwnode_handle *
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software_node_get_parent(const struct fwnode_handle *fwnode)
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{
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struct swnode *swnode = to_swnode(fwnode);
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return swnode ? (swnode->parent ? &swnode->parent->fwnode : NULL) : NULL;
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}
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static struct fwnode_handle *
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software_node_get_next_child(const struct fwnode_handle *fwnode,
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struct fwnode_handle *child)
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{
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struct swnode *p = to_swnode(fwnode);
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struct swnode *c = to_swnode(child);
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if (!p || list_empty(&p->children) ||
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(c && list_is_last(&c->entry, &p->children)))
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return NULL;
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if (c)
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c = list_next_entry(c, entry);
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else
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c = list_first_entry(&p->children, struct swnode, entry);
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return &c->fwnode;
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}
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static struct fwnode_handle *
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software_node_get_named_child_node(const struct fwnode_handle *fwnode,
|
|
const char *childname)
|
|
{
|
|
struct swnode *swnode = to_swnode(fwnode);
|
|
struct swnode *child;
|
|
|
|
if (!swnode || list_empty(&swnode->children))
|
|
return NULL;
|
|
|
|
list_for_each_entry(child, &swnode->children, entry) {
|
|
if (!strcmp(childname, kobject_name(&child->kobj))) {
|
|
kobject_get(&child->kobj);
|
|
return &child->fwnode;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
software_node_get_reference_args(const struct fwnode_handle *fwnode,
|
|
const char *propname, const char *nargs_prop,
|
|
unsigned int nargs, unsigned int index,
|
|
struct fwnode_reference_args *args)
|
|
{
|
|
struct swnode *swnode = to_swnode(fwnode);
|
|
const struct software_node_reference *ref;
|
|
const struct property_entry *prop;
|
|
struct fwnode_handle *refnode;
|
|
int i;
|
|
|
|
if (!swnode || !swnode->node->references)
|
|
return -ENOENT;
|
|
|
|
for (ref = swnode->node->references; ref->name; ref++)
|
|
if (!strcmp(ref->name, propname))
|
|
break;
|
|
|
|
if (!ref->name || index > (ref->nrefs - 1))
|
|
return -ENOENT;
|
|
|
|
refnode = software_node_fwnode(ref->refs[index].node);
|
|
if (!refnode)
|
|
return -ENOENT;
|
|
|
|
if (nargs_prop) {
|
|
prop = property_entry_get(swnode->node->properties, nargs_prop);
|
|
if (!prop)
|
|
return -EINVAL;
|
|
|
|
nargs = prop->value.u32_data;
|
|
}
|
|
|
|
if (nargs > NR_FWNODE_REFERENCE_ARGS)
|
|
return -EINVAL;
|
|
|
|
args->fwnode = software_node_get(refnode);
|
|
args->nargs = nargs;
|
|
|
|
for (i = 0; i < nargs; i++)
|
|
args->args[i] = ref->refs[index].args[i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct fwnode_operations software_node_ops = {
|
|
.get = software_node_get,
|
|
.put = software_node_put,
|
|
.property_present = software_node_property_present,
|
|
.property_read_int_array = software_node_read_int_array,
|
|
.property_read_string_array = software_node_read_string_array,
|
|
.get_parent = software_node_get_parent,
|
|
.get_next_child_node = software_node_get_next_child,
|
|
.get_named_child_node = software_node_get_named_child_node,
|
|
.get_reference_args = software_node_get_reference_args
|
|
};
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
/**
|
|
* software_node_find_by_name - Find software node by name
|
|
* @parent: Parent of the software node
|
|
* @name: Name of the software node
|
|
*
|
|
* The function will find a node that is child of @parent and that is named
|
|
* @name. If no node is found, the function returns NULL.
|
|
*
|
|
* NOTE: you will need to drop the reference with fwnode_handle_put() after use.
|
|
*/
|
|
const struct software_node *
|
|
software_node_find_by_name(const struct software_node *parent, const char *name)
|
|
{
|
|
struct swnode *swnode = NULL;
|
|
struct kobject *k;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
spin_lock(&swnode_kset->list_lock);
|
|
|
|
list_for_each_entry(k, &swnode_kset->list, entry) {
|
|
swnode = kobj_to_swnode(k);
|
|
if (parent == swnode->node->parent && swnode->node->name &&
|
|
!strcmp(name, swnode->node->name)) {
|
|
kobject_get(&swnode->kobj);
|
|
break;
|
|
}
|
|
swnode = NULL;
|
|
}
|
|
|
|
spin_unlock(&swnode_kset->list_lock);
|
|
|
|
return swnode ? swnode->node : NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(software_node_find_by_name);
|
|
|
|
static int
|
|
software_node_register_properties(struct software_node *node,
|
|
const struct property_entry *properties)
|
|
{
|
|
struct property_entry *props;
|
|
|
|
props = property_entries_dup(properties);
|
|
if (IS_ERR(props))
|
|
return PTR_ERR(props);
|
|
|
|
node->properties = props;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void software_node_release(struct kobject *kobj)
|
|
{
|
|
struct swnode *swnode = kobj_to_swnode(kobj);
|
|
|
|
if (swnode->allocated) {
|
|
property_entries_free(swnode->node->properties);
|
|
kfree(swnode->node);
|
|
}
|
|
ida_destroy(&swnode->child_ids);
|
|
kfree(swnode);
|
|
}
|
|
|
|
static struct kobj_type software_node_type = {
|
|
.release = software_node_release,
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
};
|
|
|
|
static struct fwnode_handle *
|
|
swnode_register(const struct software_node *node, struct swnode *parent,
|
|
unsigned int allocated)
|
|
{
|
|
struct swnode *swnode;
|
|
int ret;
|
|
|
|
swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
|
|
if (!swnode) {
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
|
|
0, 0, GFP_KERNEL);
|
|
if (ret < 0) {
|
|
kfree(swnode);
|
|
goto out_err;
|
|
}
|
|
|
|
swnode->id = ret;
|
|
swnode->node = node;
|
|
swnode->parent = parent;
|
|
swnode->allocated = allocated;
|
|
swnode->kobj.kset = swnode_kset;
|
|
swnode->fwnode.ops = &software_node_ops;
|
|
|
|
ida_init(&swnode->child_ids);
|
|
INIT_LIST_HEAD(&swnode->entry);
|
|
INIT_LIST_HEAD(&swnode->children);
|
|
|
|
if (node->name)
|
|
ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
|
|
parent ? &parent->kobj : NULL,
|
|
"%s", node->name);
|
|
else
|
|
ret = kobject_init_and_add(&swnode->kobj, &software_node_type,
|
|
parent ? &parent->kobj : NULL,
|
|
"node%d", swnode->id);
|
|
if (ret) {
|
|
kobject_put(&swnode->kobj);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
if (parent)
|
|
list_add_tail(&swnode->entry, &parent->children);
|
|
|
|
kobject_uevent(&swnode->kobj, KOBJ_ADD);
|
|
return &swnode->fwnode;
|
|
|
|
out_err:
|
|
if (allocated)
|
|
property_entries_free(node->properties);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* software_node_register_nodes - Register an array of software nodes
|
|
* @nodes: Zero terminated array of software nodes to be registered
|
|
*
|
|
* Register multiple software nodes at once.
|
|
*/
|
|
int software_node_register_nodes(const struct software_node *nodes)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
for (i = 0; nodes[i].name; i++) {
|
|
ret = software_node_register(&nodes[i]);
|
|
if (ret) {
|
|
software_node_unregister_nodes(nodes);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(software_node_register_nodes);
|
|
|
|
/**
|
|
* software_node_unregister_nodes - Unregister an array of software nodes
|
|
* @nodes: Zero terminated array of software nodes to be unregistered
|
|
*
|
|
* Unregister multiple software nodes at once.
|
|
*/
|
|
void software_node_unregister_nodes(const struct software_node *nodes)
|
|
{
|
|
struct swnode *swnode;
|
|
int i;
|
|
|
|
for (i = 0; nodes[i].name; i++) {
|
|
swnode = software_node_to_swnode(&nodes[i]);
|
|
if (swnode)
|
|
fwnode_remove_software_node(&swnode->fwnode);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
|
|
|
|
/**
|
|
* software_node_register - Register static software node
|
|
* @node: The software node to be registered
|
|
*/
|
|
int software_node_register(const struct software_node *node)
|
|
{
|
|
struct swnode *parent = software_node_to_swnode(node->parent);
|
|
|
|
if (software_node_to_swnode(node))
|
|
return -EEXIST;
|
|
|
|
return PTR_ERR_OR_ZERO(swnode_register(node, parent, 0));
|
|
}
|
|
EXPORT_SYMBOL_GPL(software_node_register);
|
|
|
|
struct fwnode_handle *
|
|
fwnode_create_software_node(const struct property_entry *properties,
|
|
const struct fwnode_handle *parent)
|
|
{
|
|
struct software_node *node;
|
|
struct swnode *p = NULL;
|
|
int ret;
|
|
|
|
if (parent) {
|
|
if (IS_ERR(parent))
|
|
return ERR_CAST(parent);
|
|
if (!is_software_node(parent))
|
|
return ERR_PTR(-EINVAL);
|
|
p = to_swnode(parent);
|
|
}
|
|
|
|
node = kzalloc(sizeof(*node), GFP_KERNEL);
|
|
if (!node)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = software_node_register_properties(node, properties);
|
|
if (ret) {
|
|
kfree(node);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
node->parent = p ? p->node : NULL;
|
|
|
|
return swnode_register(node, p, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_create_software_node);
|
|
|
|
void fwnode_remove_software_node(struct fwnode_handle *fwnode)
|
|
{
|
|
struct swnode *swnode = to_swnode(fwnode);
|
|
|
|
if (!swnode)
|
|
return;
|
|
|
|
if (swnode->parent) {
|
|
ida_simple_remove(&swnode->parent->child_ids, swnode->id);
|
|
list_del(&swnode->entry);
|
|
} else {
|
|
ida_simple_remove(&swnode_root_ids, swnode->id);
|
|
}
|
|
|
|
kobject_put(&swnode->kobj);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fwnode_remove_software_node);
|
|
|
|
int software_node_notify(struct device *dev, unsigned long action)
|
|
{
|
|
struct fwnode_handle *fwnode = dev_fwnode(dev);
|
|
struct swnode *swnode;
|
|
int ret;
|
|
|
|
if (!fwnode)
|
|
return 0;
|
|
|
|
if (!is_software_node(fwnode))
|
|
fwnode = fwnode->secondary;
|
|
if (!is_software_node(fwnode))
|
|
return 0;
|
|
|
|
swnode = to_swnode(fwnode);
|
|
|
|
switch (action) {
|
|
case KOBJ_ADD:
|
|
ret = sysfs_create_link(&dev->kobj, &swnode->kobj,
|
|
"software_node");
|
|
if (ret)
|
|
break;
|
|
|
|
ret = sysfs_create_link(&swnode->kobj, &dev->kobj,
|
|
dev_name(dev));
|
|
if (ret) {
|
|
sysfs_remove_link(&dev->kobj, "software_node");
|
|
break;
|
|
}
|
|
kobject_get(&swnode->kobj);
|
|
break;
|
|
case KOBJ_REMOVE:
|
|
sysfs_remove_link(&swnode->kobj, dev_name(dev));
|
|
sysfs_remove_link(&dev->kobj, "software_node");
|
|
kobject_put(&swnode->kobj);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init software_node_init(void)
|
|
{
|
|
swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
|
|
if (!swnode_kset)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
postcore_initcall(software_node_init);
|
|
|
|
static void __exit software_node_exit(void)
|
|
{
|
|
ida_destroy(&swnode_root_ids);
|
|
kset_unregister(swnode_kset);
|
|
}
|
|
__exitcall(software_node_exit);
|