linux-kernel - [PATCH] clk: mediatek: Fix error handling in runtime PM setup

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Message-ID: <20251123154315.1564-1-vulab@iscas.ac.cn>
Date: Sun, 23 Nov 2025 23:43:15 +0800
From: Haotian Zhang <vulab@...as.ac.cn>
To: mturquette@...libre.com,
	sboyd@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com
Cc: nfraprado@...labora.com,
	laura.nao@...labora.com,
	wenst@...omium.org,
	linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Haotian Zhang <vulab@...as.ac.cn>
Subject: [PATCH] clk: mediatek: Fix error handling in runtime PM setup

devm_pm_runtime_enable() can fail due to memory allocation. The current
code ignores its return value, and when pm_runtime_resume_and_get() fails,
it returns directly without unmapping the shared_io region.

Add error handling for devm_pm_runtime_enable(). Reorder cleanup labels
to properly unmap shared_io on pm_runtime_resume_and_get() failure.

Fixes: 2f7b1d8b5505 ("clk: mediatek: Do a runtime PM get on controllers during probe")
Signed-off-by: Haotian Zhang <vulab@...as.ac.cn>
---
 drivers/clk/mediatek/clk-mtk.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
index ba1d1c495bc2..644e5a854f2b 100644
--- a/drivers/clk/mediatek/clk-mtk.c
+++ b/drivers/clk/mediatek/clk-mtk.c
@@ -497,14 +497,16 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev,
 
 
 	if (mcd->need_runtime_pm) {
-		devm_pm_runtime_enable(&pdev->dev);
+		r = devm_pm_runtime_enable(&pdev->dev);
+		if (r)
+			goto unmap_io;
 		/*
 		 * Do a pm_runtime_resume_and_get() to workaround a possible
 		 * deadlock between clk_register() and the genpd framework.
 		 */
 		r = pm_runtime_resume_and_get(&pdev->dev);
 		if (r)
-			return r;
+			goto unmap_io;
 	}
 
 	/* Calculate how many clk_hw_onecell_data entries to allocate */
@@ -618,11 +620,11 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev,
 free_data:
 	mtk_free_clk_data(clk_data);
 free_base:
-	if (mcd->shared_io && base)
-		iounmap(base);
-
 	if (mcd->need_runtime_pm)
 		pm_runtime_put(&pdev->dev);
+unmap_io:
+	if (mcd->shared_io && base)
+		iounmap(base);
 	return r;
 }
 
-- 
2.50.1.windows.1