linux-kernel - [PATCH v4 2/3] bus: mvebu: add missing of_node

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Date:	Mon, 26 Aug 2013 19:36:57 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<jszhang@...vell.com>, <jason@...edaemon.net>, <andrew@...n.ch>,
	<gregory.clement@...e-electrons.com>,
	<thomas.petazzoni@...e-electrons.com>,
	<ezequiel.garcia@...e-electrons.com>, <mturquette@...aro.org>,
	<sebastian.hesselbarth@...il.com>, <linus.walleij@...aro.org>
CC:	<linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v4 2/3] bus: mvebu: add missing of_node_put() to fix reference leak

Add of_node_put to properly decrement the refcount when we are
done using a given node.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
---
 drivers/bus/mvebu-mbus.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 19ab6ff..a7c12fb 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -701,6 +701,7 @@ static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
 					 size_t sdramwins_size)
 {
 	int win;
+	struct device_node *np;
 
 	mbus->mbuswins_base = ioremap(mbuswins_phys_base, mbuswins_size);
 	if (!mbus->mbuswins_base)
@@ -712,8 +713,11 @@ static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
 		return -ENOMEM;
 	}
 
-	if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric"))
+	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
+	if (np) {
 		mbus->hw_io_coherency = 1;
+		of_node_put(np);
+	}
 
 	for (win = 0; win < mbus->soc->num_wins; win++)
 		mvebu_mbus_disable_window(mbus, win);
@@ -902,23 +906,27 @@ int __init mvebu_mbus_dt_init(void)
 	prop = of_get_property(np, "controller", NULL);
 	if (!prop) {
 		pr_err("required 'controller' property missing\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto np_out;
 	}
 
 	controller = of_find_node_by_phandle(be32_to_cpup(prop));
 	if (!controller) {
 		pr_err("could not find an 'mbus-controller' node\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto np_out;
 	}
 
 	if (of_address_to_resource(controller, 0, &mbuswins_res)) {
 		pr_err("cannot get MBUS register address\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto phandle_out;
 	}
 
 	if (of_address_to_resource(controller, 1, &sdramwins_res)) {
 		pr_err("cannot get SDRAM register address\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto phandle_out;
 	}
 
 	/* Get optional pcie-{mem,io}-aperture properties */
@@ -931,9 +939,14 @@ int __init mvebu_mbus_dt_init(void)
 				     sdramwins_res.start,
 				     resource_size(&sdramwins_res));
 	if (ret)
-		return ret;
+		goto phandle_out;
 
 	/* Setup statically declared windows in the DT */
-	return mbus_dt_setup(&mbus_state, np);
+	ret = mbus_dt_setup(&mbus_state, np);
+phandle_out:
+	of_node_put(controller);
+np_out:
+	of_node_put(np);
+	return ret;
 }
 #endif
-- 
1.8.4.rc3

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