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From 0d0e02d605c5696a5076510f564fefe659127aa4 Mon Sep 17 00:00:00 2001
From: Grant Likely <grant.likely@linaro.org>
Date: Thu, 22 May 2014 01:04:17 +0900
Subject: [PATCH] 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>
---
drivers/of/base.c | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -545,6 +545,22 @@ struct device_node *of_get_next_parent(s
}
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
@@ -560,11 +576,7 @@ struct device_node *of_get_next_child(co
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;
}
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