[PATCH] of/address: Fix of_node memory leak in of_dma_is_coherent

[Evan Nimmo]

Commit dabf6b36b83a ("of: Add OF_DMA_DEFAULT_COHERENT & select it on
powerpc") added a check to of_dma_is_coherent which returns early
if OF_DMA_DEFAULT_COHERENT is enabled. This results in the of_node_put()
being skipped causing a memory leak. Moved the of_node_get() below this
check so we now we only get the node if OF_DMA_DEFAULT_COHERENT is not
enabled.

Fixes: dabf6b36b83a ("of: Add OF_DMA_DEFAULT_COHERENT & select it on
powerpc")

Signed-off-by: Evan Nimmo <evan.ni...@alliedtelesis.co.nz>
---
 drivers/of/address.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index eb9ab4f1e80b..1c3257a2d4e3 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -1034,11 +1034,13 @@ int of_dma_get_range(struct device_node *np, const 
struct bus_dma_region **map)
  */
 bool of_dma_is_coherent(struct device_node *np)
 {
-       struct device_node *node = of_node_get(np);
+       struct device_node *node;
 
        if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT))
                return true;
 
+       node = of_node_get(np);
+
        while (node) {
                if (of_property_read_bool(node, "dma-coherent")) {
                        of_node_put(node);
-- 
2.27.0