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authorMichael Ellerman <michael@ellerman.id.au>2007-10-26 16:54:31 +1000
committerPaul Mackerras <paulus@samba.org>2008-02-06 16:29:59 +1100
commitf4eb010706b6c96c136c7aaa9079159743f33fa8 (patch)
tree53be8d89ad0073f90b2975e780c0426249ee3f3e /include/linux/of.h
parent58119068cb27ef7513f80aff44b62a3a8f40ef5f (diff)
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[POWERPC] Add of_get_next_parent()
Iterating through a device node's parents is simple enough, but dealing with the refcounts properly is a little ugly, and replicating that logic is asking for someone to get it wrong or forget it all together, eg: while (dn != NULL) { /* loop body */ tmp = of_get_parent(dn); of_node_put(dn); dn = tmp; } So add of_get_next_parent(), inspired by of_get_next_child(). The contract is that it returns the parent and drops the reference on the current node, this makes the loop look like: while (dn != NULL) { /* loop body */ dn = of_get_next_parent(dn); } Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/linux/of.h')
-rw-r--r--include/linux/of.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h
index b5f33efcb8e2..6981016dcc25 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -50,6 +50,7 @@ extern struct device_node *of_find_matching_node(struct device_node *from,
extern struct device_node *of_find_node_by_path(const char *path);
extern struct device_node *of_find_node_by_phandle(phandle handle);
extern struct device_node *of_get_parent(const struct device_node *node);
+extern struct device_node *of_get_next_parent(struct device_node *node);
extern struct device_node *of_get_next_child(const struct device_node *node,
struct device_node *prev);
#define for_each_child_of_node(parent, child) \