Commit 0829f6d1 authored by Pantelis Antoniou's avatar Pantelis Antoniou Committed by Grant Likely
Browse files

of: device_node kobject lifecycle fixes 



After the move to having device nodes be proper kobjects the lifecycle
of the node needs to be controlled better.

At first convert of_add_node() in the unflattened functions to
of_init_node() which initializes the kobject so that of_node_get/put
work correctly even before of_init is called.

Afterwards introduce of_node_is_initialized & of_node_is_attached that
query the underlying kobject about the state (attached means kobj
is visible in sysfs)

Using that make sure the lifecycle of the tree is correct at all
times.

Signed-off-by: default avatarPantelis Antoniou <panto@antoniou-consulting.com>
[grant.likely: moved of_node_init() calls, fixed up locking, and
               dropped __of_populate() hunks]
Signed-off-by: default avatarGrant Likely <grant.likely@linaro.org>
parent 8357041a

drivers/of/base.c

+26 −9
Original line number Diff line number Diff line
@@ -246,10 +246,19 @@ static int __of_node_add(struct device_node *np) 
int of_node_add(struct device_node *np)

{

	int rc = 0;

	kobject_init(&np->kobj, &of_node_ktype);



	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_aliases_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_aliases_mutex);

	return rc;

}
@@ -259,11 +268,18 @@ static void of_node_remove(struct device_node *np) 
{

	struct property *pp;



	BUG_ON(!of_node_is_initialized(np));



	/* only remove properties if on sysfs */

	if (of_node_is_attached(np)) {

		for_each_property_of_node(np, pp)

			sysfs_remove_bin_file(&np->kobj, &pp->attr);



		kobject_del(&np->kobj);

	}



	/* finally remove the kobj_init ref */

	of_node_put(np);

}

#endif



static int __init of_init(void)
@@ -1631,6 +1647,10 @@ static int of_property_notify(int action, struct device_node *np, 
{

	struct of_prop_reconfig pr;



	/* only call notifiers if the node is attached */

	if (!of_node_is_attached(np))

		return 0;



	pr.dn = np;

	pr.prop = prop;

	return of_reconfig_notify(action, &pr);
@@ -1682,10 +1702,7 @@ int of_add_property(struct device_node *np, struct property *prop) 
	if (rc)

		return rc;



	/* at early boot, bail hear and defer setup to of_init() */

	if (!of_kset)

		return 0;



	if (of_node_is_attached(np))

		__of_add_property_sysfs(np, prop);



	return rc;

drivers/of/fdt.c

+1 −2
Original line number Diff line number Diff line
@@ -202,6 +202,7 @@ static void * unflatten_dt_node(struct boot_param_header *blob, 
				__alignof__(struct device_node));

	if (allnextpp) {

		char *fn;

		of_node_init(np);

		np->full_name = fn = ((char *)np) + sizeof(*np);

		if (new_format) {

			/* rebuild full path for new format */
@@ -326,8 +327,6 @@ static void * unflatten_dt_node(struct boot_param_header *blob, 
			np->name = "<NULL>";

		if (!np->type)

			np->type = "<NULL>";



		of_node_add(np);

	}

	while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {

		if (tag == OF_DT_NOP)

drivers/of/pdt.c

+1 −2
Original line number Diff line number Diff line
@@ -176,6 +176,7 @@ static struct device_node * __init of_pdt_create_node(phandle node, 
		return NULL;



	dp = prom_early_alloc(sizeof(*dp));

	of_node_init(dp);

	of_pdt_incr_unique_id(dp);

	dp->parent = parent;
@@ -213,7 +214,6 @@ static struct device_node * __init of_pdt_build_tree(struct device_node *parent, 
		*nextp = &dp->allnext;



		dp->full_name = of_pdt_build_full_name(dp);

		of_node_add(dp);



		dp->child = of_pdt_build_tree(dp,

				of_pdt_prom_ops->getchild(node), nextp);
@@ -244,7 +244,6 @@ void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) 
	of_allnodes->path_component_name = "";

#endif

	of_allnodes->full_name = "/";

	of_node_add(of_allnodes);



	nextp = &of_allnodes->allnext;

	of_allnodes->child = of_pdt_build_tree(of_allnodes,

include/linux/of.h

+19 −0
Original line number Diff line number Diff line
@@ -76,6 +76,25 @@ struct of_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)

{

	kobject_init(&node->kobj, &of_node_ktype);

}



/* true when node is initialized */

static inline int of_node_is_initialized(struct device_node *node)

{

	return node && node->kobj.state_initialized;

}



/* true when node is attached (i.e. present on sysfs) */

static inline int of_node_is_attached(struct device_node *node)

{

	return node && node->kobj.state_in_sysfs;

}



#ifdef CONFIG_OF_DYNAMIC

extern struct device_node *of_node_get(struct device_node *node);

extern void of_node_put(struct device_node *node);

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