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of: Create unlocked version of for_each_child_of_node()

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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: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Grant Likely 2014-05-22 01:04:17 +09:00
parent 11d200e95f
commit 0d0e02d605
1 changed files with 17 additions and 5 deletions
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22
drivers/of/base.c
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@ -695,6 +695,22 @@ struct device_node *of_get_next_parent(struct device_node *node)
} }
EXPORT_SYMBOL(of_get_next_parent); 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 * of_get_next_child - Iterate a node childs
* @node: parent node * @node: parent node
@ -710,11 +726,7 @@ struct device_node *of_get_next_child(const struct device_node *node,
unsigned long flags; unsigned long flags;
raw_spin_lock_irqsave(&devtree_lock, flags); raw_spin_lock_irqsave(&devtree_lock, flags);
next = prev ? prev->sibling : node->child; next = __of_get_next_child(node, prev);
for (; next; next = next->sibling)
if (of_node_get(next))
break;
of_node_put(prev);
raw_spin_unlock_irqrestore(&devtree_lock, flags); raw_spin_unlock_irqrestore(&devtree_lock, flags);
return next; return next;
} }