linux-kernel - [RFT PATCH v2] [media] exynos4-is: Fix fimc_is_parse_sensor

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Message-Id: <1458780100-8865-1-git-send-email-javier@osg.samsung.com>
Date:	Wed, 23 Mar 2016 21:41:40 -0300
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-samsung-soc@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Andreas Färber <afaerber@...e.de>,
	linux-media@...r.kernel.org,
	Javier Martinez Canillas <javier@....samsung.com>
Subject: [RFT PATCH v2] [media] exynos4-is: Fix fimc_is_parse_sensor_config() nodes handling

The same struct device_node * is used for looking up the I2C sensor, OF
graph endpoint and port. So the reference count is incremented but not
decremented for the endpoint and port nodes.

Fix this by having separate pointers for each node looked up.

Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

---
Hello,

This patch was only build tested because I don't have an Exynos4
board to test. So testing on real HW will be highly appreciated.

Best regards,
Javier

Changes in v2:
- Use the correct node var in the error print out. Suggested by Andreas Färber.

 drivers/media/platform/exynos4-is/fimc-is.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c
index 979c388ebf60..a97edd078327 100644
--- a/drivers/media/platform/exynos4-is/fimc-is.c
+++ b/drivers/media/platform/exynos4-is/fimc-is.c
@@ -165,6 +165,7 @@ static int fimc_is_parse_sensor_config(struct fimc_is *is, unsigned int index,
 						struct device_node *node)
 {
 	struct fimc_is_sensor *sensor = &is->sensor[index];
+	struct device_node *ep, *port;
 	u32 tmp = 0;
 	int ret;
 
@@ -175,22 +176,25 @@ static int fimc_is_parse_sensor_config(struct fimc_is *is, unsigned int index,
 		return -EINVAL;
 	}
 
-	node = of_graph_get_next_endpoint(node, NULL);
-	if (!node)
+	ep = of_graph_get_next_endpoint(node, NULL);
+	if (!ep)
 		return -ENXIO;
 
-	node = of_graph_get_remote_port(node);
-	if (!node)
+	port = of_graph_get_remote_port(ep);
+	of_node_put(ep);
+	if (!port)
 		return -ENXIO;
 
 	/* Use MIPI-CSIS channel id to determine the ISP I2C bus index. */
-	ret = of_property_read_u32(node, "reg", &tmp);
+	ret = of_property_read_u32(port, "reg", &tmp);
 	if (ret < 0) {
 		dev_err(&is->pdev->dev, "reg property not found at: %s\n",
-							 node->full_name);
+							 port->full_name);
+		of_node_put(port);
 		return ret;
 	}
 
+	of_node_put(port);
 	sensor->i2c_bus = tmp - FIMC_INPUT_MIPI_CSI2_0;
 	return 0;
 }
-- 
2.5.0