linux-kernel - [PATCH] cpufreq: mediatek-hw: don't use error path on NULL fdvfs

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Message-Id: <20250819-mt8196-cpufreq-fix-v1-1-adb60a3082dc@collabora.com>
Date: Tue, 19 Aug 2025 13:21:42 +0200
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: Dan Carpenter <dan.carpenter@...aro.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: kernel@...labora.com, 
 AngeloGioacchino Del Regno <angelogiaocchino.delregno@...labora.com>, 
 linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH] cpufreq: mediatek-hw: don't use error path on NULL fdvfs

The IS_ERR_OR_NULL check for priv->fdvfs is inappropriate, and should be
an IS_ERR check instead, as a NULL value here would propagate it to
PTR_ERR.

In practice, there is no problem here, as devm_of_iomap cannot return
NULL in any circumstance. However, it causes a Smatch static checker
warning.

Fix the warning by changing the check from IS_ERR_OR_NULL to IS_ERR.

Fixes: 32e0d669f3ac ("cpufreq: mediatek-hw: Add support for MT8196")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/linux-pm/aKQubSEXH1TXQpnR@stanley.mountain/
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/cpufreq/mediatek-cpufreq-hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
index e4eadce6f937ceff51b34d22da83c51b4e9aa813..fce5aa5ceea033bb70537ad9280e9ee02e3671cc 100644
--- a/drivers/cpufreq/mediatek-cpufreq-hw.c
+++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
@@ -72,7 +72,7 @@ static const struct mtk_cpufreq_variant cpufreq_mtk_base_variant = {
 static int mtk_cpufreq_hw_mt8196_init(struct mtk_cpufreq_priv *priv)
 {
 	priv->fdvfs = devm_of_iomap(priv->dev, priv->dev->of_node, 0, NULL);
-	if (IS_ERR_OR_NULL(priv->fdvfs))
+	if (IS_ERR(priv->fdvfs))
 		return dev_err_probe(priv->dev, PTR_ERR(priv->fdvfs),
 				     "failed to get fdvfs iomem\n");

---
base-commit: 73df59e80dc7cab098b4581b89459d18f8410c7d
change-id: 20250819-mt8196-cpufreq-fix-07557cca2ef1

Best regards,
-- 
Nicolas Frattaroli <nicolas.frattaroli@...labora.com>