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authorGrant Likely <grant.likely@linaro.org>2014-05-22 01:04:17 +0900
committerGrant Likely <grant.likely@linaro.org>2014-05-23 11:25:27 +0900
commit0d0e02d605c5696a5076510f564fefe659127aa4 (patch)
tree90fa79bec74f545d261e315d63b6228d439a23e1 /drivers/of/base.c
parent11d200e95f3e84c1102e4cc9863a3614fd41f3ad (diff)
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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: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r--drivers/of/base.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 63ae00ec72ff..9df50c74162c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -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;
}