[PATCH 3.2 052/107] of/address: Don't loop forever in of_find_matching_node_by_address().

From: Ben Hutchings
Date: Thu Oct 08 2015 - 20:48:24 EST


3.2.72-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: David Daney <david.daney@xxxxxxxxxx>

commit 3a496b00b6f90c41bd21a410871dfc97d4f3c7ab upstream.

If the internal call to of_address_to_resource() fails, we end up
looping forever in of_find_matching_node_by_address(). This can be
caused by a defective device tree, or calling with an incorrect
matches argument.

Fix by calling of_find_matching_node() unconditionally at the end of
the loop.

Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/of/address.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -604,10 +604,10 @@ struct device_node *of_find_matching_nod
struct resource res;

while (dn) {
- if (of_address_to_resource(dn, 0, &res))
- continue;
- if (res.start == base_address)
+ if (!of_address_to_resource(dn, 0, &res) &&
+ res.start == base_address)
return dn;
+
dn = of_find_matching_node(dn, matches);
}


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