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-rw-r--r--drivers/of/base.c96
-rw-r--r--drivers/of/dynamic.c12
-rw-r--r--drivers/of/of_private.h10
-rw-r--r--include/linux/of.h2
4 files changed, 69 insertions, 51 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index b403f9d98461..ad4929cbd876 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -37,10 +37,13 @@ struct device_node *of_chosen;
struct device_node *of_aliases;
static struct device_node *of_stdout;
-static struct kset *of_kset;
+struct kset *of_kset;
/*
- * Used to protect the of_aliases, to hold off addition of nodes to sysfs
+ * Used to protect the of_aliases, to hold off addition of nodes to sysfs.
+ * This mutex must be held whenever modifications are being made to the
+ * device tree. The of_{attach,detach}_node() and
+ * of_{add,remove,update}_property() helpers make sure this happens.
*/
DEFINE_MUTEX(of_mutex);
@@ -127,13 +130,16 @@ static const char *safe_name(struct kobject *kobj, const char *orig_name)
return name;
}
-static int __of_add_property_sysfs(struct device_node *np, struct property *pp)
+int __of_add_property_sysfs(struct device_node *np, struct property *pp)
{
int rc;
/* Important: Don't leak passwords */
bool secure = strncmp(pp->name, "security-", 9) == 0;
+ if (!of_kset || !of_node_is_attached(np))
+ return 0;
+
sysfs_bin_attr_init(&pp->attr);
pp->attr.attr.name = safe_name(&np->kobj, pp->name);
pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO;
@@ -145,12 +151,15 @@ static int __of_add_property_sysfs(struct device_node *np, struct property *pp)
return rc;
}
-static int __of_node_add(struct device_node *np)
+int __of_attach_node_sysfs(struct device_node *np)
{
const char *name;
struct property *pp;
int rc;
+ if (!of_kset)
+ return 0;
+
np->kobj.kset = of_kset;
if (!np->parent) {
/* Nodes without parents are new top level trees */
@@ -172,26 +181,6 @@ static int __of_node_add(struct device_node *np)
return 0;
}
-int of_node_add(struct device_node *np)
-{
- int rc = 0;
-
- BUG_ON(!of_node_is_initialized(np));
-
- /*
- * Grab the mutex here so that in a race condition between of_init() and
- * of_node_add(), node addition will still be consistent.
- */
- mutex_lock(&of_mutex);
- if (of_kset)
- rc = __of_node_add(np);
- else
- /* This scenario may be perfectly valid, but report it anyway */
- pr_info("of_node_add(%s) before of_init()\n", np->full_name);
- mutex_unlock(&of_mutex);
- return rc;
-}
-
static int __init of_init(void)
{
struct device_node *np;
@@ -204,7 +193,7 @@ static int __init of_init(void)
return -ENOMEM;
}
for_each_of_allnodes(np)
- __of_node_add(np);
+ __of_attach_node_sysfs(np);
mutex_unlock(&of_mutex);
/* Symlink in /proc as required by userspace ABI */
@@ -1689,15 +1678,17 @@ int of_add_property(struct device_node *np, struct property *prop)
if (rc)
return rc;
+ mutex_lock(&of_mutex);
+
raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_add_property(np, prop);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
- if (rc)
- return rc;
- if (of_node_is_attached(np))
+ if (!rc)
__of_add_property_sysfs(np, prop);
+ mutex_unlock(&of_mutex);
+
return rc;
}
@@ -1720,6 +1711,13 @@ int __of_remove_property(struct device_node *np, struct property *prop)
return 0;
}
+void __of_remove_property_sysfs(struct device_node *np, struct property *prop)
+{
+ /* at early boot, bail here and defer setup to of_init() */
+ if (of_kset && of_node_is_attached(np))
+ sysfs_remove_bin_file(&np->kobj, &prop->attr);
+}
+
/**
* of_remove_property - Remove a property from a node.
*
@@ -1737,20 +1735,18 @@ int of_remove_property(struct device_node *np, struct property *prop)
if (rc)
return rc;
+ mutex_lock(&of_mutex);
+
raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_remove_property(np, prop);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
- if (rc)
- return rc;
-
- /* at early boot, bail hear and defer setup to of_init() */
- if (!of_kset)
- return 0;
+ if (!rc)
+ __of_remove_property_sysfs(np, prop);
- sysfs_remove_bin_file(&np->kobj, &prop->attr);
+ mutex_unlock(&of_mutex);
- return 0;
+ return rc;
}
int __of_update_property(struct device_node *np, struct property *newprop,
@@ -1779,6 +1775,18 @@ int __of_update_property(struct device_node *np, struct property *newprop,
return 0;
}
+void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
+ struct property *oldprop)
+{
+ /* At early boot, bail out and defer setup to of_init() */
+ if (!of_kset)
+ return;
+
+ if (oldprop)
+ sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
+ __of_add_property_sysfs(np, newprop);
+}
+
/*
* of_update_property - Update a property in a node, if the property does
* not exist, add it.
@@ -1801,22 +1809,18 @@ int of_update_property(struct device_node *np, struct property *newprop)
if (rc)
return rc;
+ mutex_lock(&of_mutex);
+
raw_spin_lock_irqsave(&devtree_lock, flags);
rc = __of_update_property(np, newprop, &oldprop);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
- if (rc)
- return rc;
- /* At early boot, bail out and defer setup to of_init() */
- if (!of_kset)
- return 0;
+ if (!rc)
+ __of_update_property_sysfs(np, newprop, oldprop);
- /* Update the sysfs attribute */
- if (oldprop)
- sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
- __of_add_property_sysfs(np, newprop);
+ mutex_unlock(&of_mutex);
- return 0;
+ return rc;
}
static void of_alias_add(struct alias_prop *ap, struct device_node *np,
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 75fcc66fcefd..c875787fa394 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -41,11 +41,13 @@ void of_node_put(struct device_node *node)
}
EXPORT_SYMBOL(of_node_put);
-static void of_node_remove(struct device_node *np)
+void __of_detach_node_sysfs(struct device_node *np)
{
struct property *pp;
BUG_ON(!of_node_is_initialized(np));
+ if (!of_kset)
+ return;
/* only remove properties if on sysfs */
if (of_node_is_attached(np)) {
@@ -115,11 +117,13 @@ int of_attach_node(struct device_node *np)
if (rc)
return rc;
+ mutex_lock(&of_mutex);
raw_spin_lock_irqsave(&devtree_lock, flags);
__of_attach_node(np);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
- of_node_add(np);
+ __of_attach_node_sysfs(np);
+ mutex_unlock(&of_mutex);
return 0;
}
@@ -174,11 +178,13 @@ int of_detach_node(struct device_node *np)
if (rc)
return rc;
+ mutex_lock(&of_mutex);
raw_spin_lock_irqsave(&devtree_lock, flags);
__of_detach_node(np);
raw_spin_unlock_irqrestore(&devtree_lock, flags);
- of_node_remove(np);
+ __of_detach_node_sysfs(np);
+ mutex_unlock(&of_mutex);
return rc;
}
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index 0f6089722af9..0d99ba8caeed 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -33,6 +33,8 @@ struct alias_prop {
extern struct mutex of_mutex;
extern struct list_head aliases_lookup;
+extern struct kset *of_kset;
+
static inline struct device_node *kobj_to_device_node(struct kobject *kobj)
{
@@ -62,11 +64,19 @@ struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags);
struct device_node *__of_node_alloc(const char *full_name, gfp_t allocflags);
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 void __of_attach_node(struct device_node *np);
+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);
#endif /* _LINUX_OF_PRIVATE_H */
diff --git a/include/linux/of.h b/include/linux/of.h
index abf829a1f150..705fa12fca7f 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -74,8 +74,6 @@ struct of_phandle_args {
uint32_t args[MAX_PHANDLE_ARGS];
};
-extern int of_node_add(struct device_node *node);
-
/* initialize a node */
extern struct kobj_type of_node_ktype;
static inline void of_node_init(struct device_node *node)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 03:30:24 +0000