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author | Grant Likely <grant.likely@linaro.org> | 2014-05-22 01:04:17 +0900 |
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committer | Grant Likely <grant.likely@linaro.org> | 2014-05-23 11:25:27 +0900 |
commit | 0d0e02d605c5696a5076510f564fefe659127aa4 (patch) | |
tree | 90fa79bec74f545d261e315d63b6228d439a23e1 /drivers/of | |
parent | 11d200e95f3e84c1102e4cc9863a3614fd41f3ad (diff) | |
download | linux-stable-0d0e02d605c5696a5076510f564fefe659127aa4.tar.gz linux-stable-0d0e02d605c5696a5076510f564fefe659127aa4.tar.bz2 linux-stable-0d0e02d605c5696a5076510f564fefe659127aa4.zip |
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')
-rw-r--r-- | drivers/of/base.c | 22 |
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; } |