linux-kernel - [PATCH] clk: mediatek: add unregister logic to mtk_clk_simple

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Date:   Mon, 17 Jan 2022 17:00:29 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ikjoon Jang <ikjn@...omium.org>,
        Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>
CC:     Miles Chen <miles.chen@...iatek.com>, <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] clk: mediatek: add unregister logic to mtk_clk_simple_probe error path

Stephen pointed out that there is no unregister logic in
mtk_clk_simple_probe() error path [1].
Fix it by adding unregister logic to mtk_clk_simple_probe().

[1] https://lore.kernel.org/linux-mediatek/20220114221930.660B5C36AE9@smtp.kernel.org/

Fixes: c58cd0e40ffa ("clk: mediatek: Add mtk_clk_simple_probe() to simplify clock providers")
Cc: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Miles Chen <miles.chen@...iatek.com>
---
 drivers/clk/mediatek/clk-mtk.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index 8d5791b3f460..edf21975cb4d 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -161,6 +161,22 @@ int mtk_clk_register_gates(struct device_node *node,
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_gates);
 
+static void mtk_clk_unregister_gates(const struct mtk_gate *clks,
+		int num, struct clk_onecell_data *clk_data)
+{
+	int i;
+	const struct mtk_gate *gate;
+	struct clk *clk;
+
+	for (i = 0; i < num; i++) {
+		gate = &clks[i];
+		clk = clk_data->clks[gate->id];
+
+		if (!IS_ERR_OR_NULL(clk))
+			clk_unregister(clk);
+	}
+}
+
 struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 		void __iomem *base, spinlock_t *lock)
 {
@@ -320,15 +336,17 @@ int mtk_clk_simple_probe(struct platform_device *pdev)
 
 	r = mtk_clk_register_gates(node, mcd->clks, mcd->num_clks, clk_data);
 	if (r)
-		goto free_data;
+		goto err_free_data;
 
 	r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
 	if (r)
-		goto free_data;
+		goto err_unregister_gates;
 
 	return r;
 
-free_data:
+err_unregister_gates:
+	mtk_clk_unregister_gates(mcd->clks, mcd->num_clks, clk_data);
+err_free_data:
 	mtk_free_clk_data(clk_data);
 	return r;
 }
-- 
2.18.0