From: Michael Ellerman <michael@ellerman.id.au>
Date: Fri, 26 Oct 2007 06:54:31 +0000 (+1000)
Subject: [POWERPC] Add of_get_next_parent()
X-Git-Tag: v2.6.25-rc1~303^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4eb010706b6c96c136c7aaa9079159743f33fa8;p=pandora-kernel.git

[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>
---

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