linux-kernel - [PATCH 16/25] clocksource/drivers/integrator-ap: Add missing of_node

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Message-Id: <20181218212844.30445-16-daniel.lezcano@linaro.org>
Date:   Tue, 18 Dec 2018 22:28:34 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Yangtao Li <tiny.windzz@...il.com>
Subject: [PATCH 16/25] clocksource/drivers/integrator-ap: Add missing of_node_put()

From: Yangtao Li <tiny.windzz@...il.com>

The function of_find_node_by_path() acquires a reference to the node
returned by it and that reference needs to be dropped by its caller.

integrator_ap_timer_init_of() doesn't do that.  The pri_node and the
sec_node are used as an identifier to compare against the current
node, so we can directly drop the refcount after getting the node from
the path as it is not used as pointer.

By dropping the refcount right after getting it, a single variable is
needed instead of two.

Fix this by use a single variable and drop the refcount right after
of_find_node_by_path().

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-integrator-ap.c | 25 +++++++++++++++--------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/timer-integrator-ap.c b/drivers/clocksource/timer-integrator-ap.c
index 76e526f58620..19fb7de4b928 100644
--- a/drivers/clocksource/timer-integrator-ap.c
+++ b/drivers/clocksource/timer-integrator-ap.c
@@ -181,8 +181,7 @@ static int __init integrator_ap_timer_init_of(struct device_node *node)
 	int irq;
 	struct clk *clk;
 	unsigned long rate;
-	struct device_node *pri_node;
-	struct device_node *sec_node;
+	struct device_node *alias_node;
 
 	base = of_io_request_and_map(node, 0, "integrator-timer");
 	if (IS_ERR(base))
@@ -204,7 +203,18 @@ static int __init integrator_ap_timer_init_of(struct device_node *node)
 		return err;
 	}
 
-	pri_node = of_find_node_by_path(path);
+	alias_node = of_find_node_by_path(path);
+
+	/*
+	 * The pointer is used as an identifier not as a pointer, we
+	 * can drop the refcount on the of__node immediately after
+	 * getting it.
+	 */
+	of_node_put(alias_node);
+
+	if (node == alias_node)
+		/* The primary timer lacks IRQ, use as clocksource */
+		return integrator_clocksource_init(rate, base);
 
 	err = of_property_read_string(of_aliases,
 				"arm,timer-secondary", &path);
@@ -213,14 +223,11 @@ static int __init integrator_ap_timer_init_of(struct device_node *node)
 		return err;
 	}
 
+	alias_node = of_find_node_by_path(path);
 
-	sec_node = of_find_node_by_path(path);
-
-	if (node == pri_node)
-		/* The primary timer lacks IRQ, use as clocksource */
-		return integrator_clocksource_init(rate, base);
+	of_node_put(alias_node);
 
-	if (node == sec_node) {
+	if (node == alias_node) {
 		/* The secondary timer will drive the clock event */
 		irq = irq_of_parse_and_map(node, 0);
 		return integrator_clockevent_init(rate, base, irq);
-- 
2.17.1