mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
5801169a2e
Non-overlay dynamic devicetree node removal may leave the node in
the phandle cache. Subsequent calls to of_find_node_by_phandle()
will incorrectly find the stale entry. Remove the node from the
cache.
Add paranoia checks in of_find_node_by_phandle() as a second level
of defense (do not return cached node if detached, do not add node
to cache if detached).
Fixes: 0b3ce78e90 ("of: cache phandle nodes to reduce cost of of_find_node_by_phandle()")
Reported-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # v4.17+
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
162 lines
5.4 KiB
C
162 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
#ifndef _LINUX_OF_PRIVATE_H
|
|
#define _LINUX_OF_PRIVATE_H
|
|
/*
|
|
* Private symbols used by OF support code
|
|
*
|
|
* Paul Mackerras August 1996.
|
|
* Copyright (C) 1996-2005 Paul Mackerras.
|
|
*/
|
|
|
|
/**
|
|
* struct alias_prop - Alias property in 'aliases' node
|
|
* @link: List node to link the structure in aliases_lookup list
|
|
* @alias: Alias property name
|
|
* @np: Pointer to device_node that the alias stands for
|
|
* @id: Index value from end of alias name
|
|
* @stem: Alias string without the index
|
|
*
|
|
* The structure represents one alias property of 'aliases' node as
|
|
* an entry in aliases_lookup list.
|
|
*/
|
|
struct alias_prop {
|
|
struct list_head link;
|
|
const char *alias;
|
|
struct device_node *np;
|
|
int id;
|
|
char stem[0];
|
|
};
|
|
|
|
#if defined(CONFIG_SPARC)
|
|
#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 2
|
|
#else
|
|
#define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
|
|
#endif
|
|
|
|
#define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
|
|
|
|
extern struct mutex of_mutex;
|
|
extern struct list_head aliases_lookup;
|
|
extern struct kset *of_kset;
|
|
|
|
#if defined(CONFIG_OF_DYNAMIC)
|
|
extern int of_property_notify(int action, struct device_node *np,
|
|
struct property *prop, struct property *old_prop);
|
|
extern void of_node_release(struct kobject *kobj);
|
|
extern int __of_changeset_apply_entries(struct of_changeset *ocs,
|
|
int *ret_revert);
|
|
extern int __of_changeset_apply_notify(struct of_changeset *ocs);
|
|
extern int __of_changeset_revert_entries(struct of_changeset *ocs,
|
|
int *ret_apply);
|
|
extern int __of_changeset_revert_notify(struct of_changeset *ocs);
|
|
#else /* CONFIG_OF_DYNAMIC */
|
|
static inline int of_property_notify(int action, struct device_node *np,
|
|
struct property *prop, struct property *old_prop)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_OF_DYNAMIC */
|
|
|
|
#if defined(CONFIG_OF_KOBJ)
|
|
int of_node_is_attached(struct device_node *node);
|
|
int __of_add_property_sysfs(struct device_node *np, struct property *pp);
|
|
void __of_remove_property_sysfs(struct device_node *np, struct property *prop);
|
|
void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
|
|
struct property *oldprop);
|
|
int __of_attach_node_sysfs(struct device_node *np);
|
|
void __of_detach_node_sysfs(struct device_node *np);
|
|
#else
|
|
static inline int __of_add_property_sysfs(struct device_node *np, struct property *pp)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void __of_remove_property_sysfs(struct device_node *np, struct property *prop) {}
|
|
static inline void __of_update_property_sysfs(struct device_node *np,
|
|
struct property *newprop, struct property *oldprop) {}
|
|
static inline int __of_attach_node_sysfs(struct device_node *np)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void __of_detach_node_sysfs(struct device_node *np) {}
|
|
#endif
|
|
|
|
#if defined(CONFIG_OF_RESOLVE)
|
|
int of_resolve_phandles(struct device_node *tree);
|
|
#endif
|
|
|
|
#if defined(CONFIG_OF_DYNAMIC)
|
|
void __of_free_phandle_cache_entry(phandle handle);
|
|
#endif
|
|
|
|
#if defined(CONFIG_OF_OVERLAY)
|
|
void of_overlay_mutex_lock(void);
|
|
void of_overlay_mutex_unlock(void);
|
|
int of_free_phandle_cache(void);
|
|
void of_populate_phandle_cache(void);
|
|
#else
|
|
static inline void of_overlay_mutex_lock(void) {};
|
|
static inline void of_overlay_mutex_unlock(void) {};
|
|
#endif
|
|
|
|
#if defined(CONFIG_OF_UNITTEST) && defined(CONFIG_OF_OVERLAY)
|
|
extern void __init unittest_unflatten_overlay_base(void);
|
|
#else
|
|
static inline void unittest_unflatten_overlay_base(void) {};
|
|
#endif
|
|
|
|
extern void *__unflatten_device_tree(const void *blob,
|
|
struct device_node *dad,
|
|
struct device_node **mynodes,
|
|
void *(*dt_alloc)(u64 size, u64 align),
|
|
bool detached);
|
|
|
|
/**
|
|
* General utilities for working with live trees.
|
|
*
|
|
* All functions with two leading underscores operate
|
|
* without taking node references, so you either have to
|
|
* own the devtree lock or work on detached trees only.
|
|
*/
|
|
struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
|
|
struct device_node *__of_node_dup(const struct device_node *np,
|
|
const char *full_name);
|
|
|
|
struct device_node *__of_find_node_by_path(struct device_node *parent,
|
|
const char *path);
|
|
struct device_node *__of_find_node_by_full_path(struct device_node *node,
|
|
const char *path);
|
|
|
|
extern const void *__of_get_property(const struct device_node *np,
|
|
const char *name, int *lenp);
|
|
extern int __of_add_property(struct device_node *np, struct property *prop);
|
|
extern int __of_add_property_sysfs(struct device_node *np,
|
|
struct property *prop);
|
|
extern int __of_remove_property(struct device_node *np, struct property *prop);
|
|
extern void __of_remove_property_sysfs(struct device_node *np,
|
|
struct property *prop);
|
|
extern int __of_update_property(struct device_node *np,
|
|
struct property *newprop, struct property **oldprop);
|
|
extern void __of_update_property_sysfs(struct device_node *np,
|
|
struct property *newprop, struct property *oldprop);
|
|
|
|
extern int __of_attach_node_sysfs(struct device_node *np);
|
|
extern void __of_detach_node(struct device_node *np);
|
|
extern void __of_detach_node_sysfs(struct device_node *np);
|
|
|
|
extern void __of_sysfs_remove_bin_file(struct device_node *np,
|
|
struct property *prop);
|
|
|
|
/* illegal phandle value (set when unresolved) */
|
|
#define OF_PHANDLE_ILLEGAL 0xdeadbeef
|
|
|
|
/* iterators for transactions, used for overlays */
|
|
/* forward iterator */
|
|
#define for_each_transaction_entry(_oft, _te) \
|
|
list_for_each_entry(_te, &(_oft)->te_list, node)
|
|
|
|
/* reverse iterator */
|
|
#define for_each_transaction_entry_reverse(_oft, _te) \
|
|
list_for_each_entry_reverse(_te, &(_oft)->te_list, node)
|
|
|
|
#endif /* _LINUX_OF_PRIVATE_H */
|