linux-kernel - [PATCH v3] drivers: clk: Add missing of_node

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Message-Id: <20220616125409.3986745-1-windhl@126.com>
Date:   Thu, 16 Jun 2022 20:54:09 +0800
From:   Liang He <windhl@....com>
To:     pdeschrijver@...dia.com, pgaikwad@...dia.com, sboyd@...nel.org,
        thierry.reding@...il.com, jonathanh@...dia.com
Cc:     windhl@....com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3] drivers: clk: Add missing of_node_put()

In these clk-related drivers' xxx_init() funcitons, of_find_matching_node()
will return a node pointer with refcount incremented. We should use
of_node_put() in fail path or when it is not used anymore.

Signed-off-by: Liang He <windhl@....com>
---
 changelog:

 v3: merge clk 'missing of_node_put()' patches into one commit.
 v2: use Liang He as real name for S-o-b.
 v1: fix the missing of_node_put().


 drivers/clk/clk-nomadik.c        | 5 ++++-
 drivers/clk/tegra/clk-tegra124.c | 1 +
 drivers/clk/tegra/clk-tegra30.c  | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-nomadik.c b/drivers/clk/clk-nomadik.c
index bad2677e11ae..71fbe687fa7b 100644
--- a/drivers/clk/clk-nomadik.c
+++ b/drivers/clk/clk-nomadik.c
@@ -99,7 +99,7 @@ static void __init nomadik_src_init(void)
 	if (!src_base) {
 		pr_err("%s: must have src parent node with REGS (%pOFn)\n",
 		       __func__, np);
-		return;
+		goto out_put;
 	}
 
 	/* Set all timers to use the 2.4 MHz TIMCLK */
@@ -132,6 +132,9 @@ static void __init nomadik_src_init(void)
 	}
 	writel(val, src_base + SRC_XTALCR);
 	register_reboot_notifier(&nomadik_clk_reboot_notifier);
+
+out_put:
+	of_node_put(np);
 }
 
 /**
diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c
index 934520aab6e3..a9d4efcef2d4 100644
--- a/drivers/clk/tegra/clk-tegra124.c
+++ b/drivers/clk/tegra/clk-tegra124.c
@@ -1471,6 +1471,7 @@ static void __init tegra124_132_clock_init_pre(struct device_node *np)
 	}
 
 	pmc_base = of_iomap(node, 0);
+	of_node_put(node);
 	if (!pmc_base) {
 		pr_err("Can't map pmc registers\n");
 		WARN_ON(1);
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index 04b496123820..168c07d5a5f2 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -1320,6 +1320,7 @@ static void __init tegra30_clock_init(struct device_node *np)
 	}
 
 	pmc_base = of_iomap(node, 0);
+	of_node_put(node);
 	if (!pmc_base) {
 		pr_err("Can't map pmc registers\n");
 		BUG();
-- 
2.25.1