[PATCH 10/10] i2c: i2c-arb-gpio-challenge: use of_get_i2c_adapter_by_node interface

[Vladimir Zapolskiy]

This change is needed to properly lock I2C bus driver, which serves DDC.

Prior to this change i2c_put_adapter() is misused, which may lead
to an overflow over zero of I2C bus driver user counter.
By the way added of_node_put() to eliminate memory leak, if OF_DYNAMIC
is enabled.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy at mentor.com>
---
 drivers/i2c/muxes/i2c-arb-gpio-challenge.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
index 5cf1b60..402e3a6 100644
--- a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
+++ b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
@@ -196,7 +196,8 @@ static int i2c_arbitrator_probe(struct platform_device *pdev)
 		dev_err(dev, "Cannot parse i2c-parent\n");
 		return -EINVAL;
 	}
-	arb->parent = of_find_i2c_adapter_by_node(parent_np);
+	arb->parent = of_get_i2c_adapter_by_node(parent_np);
+	of_node_put(parent_np);
 	if (!arb->parent) {
 		dev_err(dev, "Cannot find parent bus\n");
 		return -EPROBE_DEFER;
-- 
2.1.4