diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2007-10-26 16:54:31 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-02-06 16:29:59 +1100 |
| commit | f4eb010706b6c96c136c7aaa9079159743f33fa8 (patch) | |
| tree | 53be8d89ad0073f90b2975e780c0426249ee3f3e /include/linux/of.h | |
| parent | 58119068cb27ef7513f80aff44b62a3a8f40ef5f (diff) | |
[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.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/of.h b/include/linux/of.h index b5f33efcb8e..6981016dcc2 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) \ |