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author | Stephen Rothwell <sfr@canb.auug.org.au> | 2007-04-24 07:21:29 (GMT) |
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committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2007-07-20 03:34:26 (GMT) |
commit | d1cd355a5e44dfe993efc0c0458ca9f99a28a9a3 (patch) | |
tree | 9bcc28338f70b8c3c5076f2dbf0a8d3ce551f0b8 /drivers | |
parent | e679c5f445fe142940e0962de9c5c82f10d9357c (diff) | |
download | linux-d1cd355a5e44dfe993efc0c0458ca9f99a28a9a3.tar.xz |
Consolidate of_get_next_child
This adds a read_lock around the child/next accesses on Sparc.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/of/base.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 82bb786..6b6dfcc 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -134,3 +134,27 @@ struct device_node *of_get_parent(const struct device_node *node) return np; } EXPORT_SYMBOL(of_get_parent); + +/** + * of_get_next_child - Iterate a node childs + * @node: parent node + * @prev: previous child of the parent node, or NULL to get first + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_get_next_child(const struct device_node *node, + struct device_node *prev) +{ + struct device_node *next; + + read_lock(&devtree_lock); + next = prev ? prev->sibling : node->child; + for (; next; next = next->sibling) + if (of_node_get(next)) + break; + of_node_put(prev); + read_unlock(&devtree_lock); + return next; +} +EXPORT_SYMBOL(of_get_next_child); |