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Commit 0d0e02d6 authored by Grant Likely's avatar Grant Likely
Browse files

of: Create unlocked version of for_each_child_of_node() 



When iterating over nodes, sometimes it needs to be done when the DT
lock is already held. This patch makes an unlocked version of the
for_each_child_of_node() macro.

Signed-off-by: default avatarGrant Likely <grant.likely@linaro.org>
parent 11d200e9

drivers/of/base.c

+17 −5
Original line number Diff line number Diff line
@@ -695,6 +695,22 @@ struct device_node *of_get_next_parent(struct device_node *node) 
}

EXPORT_SYMBOL(of_get_next_parent);



static struct device_node *__of_get_next_child(const struct device_node *node,

						struct device_node *prev)

{

	struct device_node *next;



	next = prev ? prev->sibling : node->child;

	for (; next; next = next->sibling)

		if (of_node_get(next))

			break;

	of_node_put(prev);

	return next;

}

#define __for_each_child_of_node(parent, child) \

	for (child = __of_get_next_child(parent, NULL); child != NULL; \

	     child = __of_get_next_child(parent, child))



/**

 *	of_get_next_child - Iterate a node childs

 *	@node:	parent node
@@ -710,11 +726,7 @@ struct device_node *of_get_next_child(const struct device_node *node, 
	unsigned long flags;



	raw_spin_lock_irqsave(&devtree_lock, flags);

	next = prev ? prev->sibling : node->child;

	for (; next; next = next->sibling)

		if (of_node_get(next))

			break;

	of_node_put(prev);

	next = __of_get_next_child(node, prev);

	raw_spin_unlock_irqrestore(&devtree_lock, flags);

	return next;

}