linux-kernel - [PATCH] ASoC: meson: add helpers for clk_disable

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Date: Tue, 13 Feb 2024 11:11:38 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Mark Brown <broonie@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Jerome Brunet <jbrunet@...libre.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] ASoC: meson: add helpers for clk_disable_unprepare

From: Arnd Bergmann <arnd@...db.de>

Casting between incompatible function types causes a warning with clang-16
because it breaks control flow integrity (KCFI) rules:

sound/soc/meson/aiu.c:243:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
  243 |                                        (void(*)(void *))clk_disable_unprepare,
      |                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/device.h:406:34: note: expanded from macro 'devm_add_action_or_reset'
  406 |         __devm_add_action_or_reset(dev, action, data, #action)
      |                                         ^~~~~~
sound/soc/meson/t9015.c:274:4: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
  274 |                         (void(*)(void *))clk_disable_unprepare,
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/device.h:406:34: note: expanded from macro 'devm_add_action_or_reset'
  406 |         __devm_add_action_or_reset(dev, action, data, #action)
      |                                         ^~~~~~

These two meson drivers cast clk_disable_unprepare() into a different type
in order to have it automatically called from the driver relase. Add
trivial helpers to do the same using correct types.

Fixes: 33901f5b9b16 ("ASoC: meson: add t9015 internal DAC driver")
Fixes: 6ae9ca9ce986 ("ASoC: meson: aiu: add i2s and spdif support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/soc/meson/aiu.c   | 9 ++++++---
 sound/soc/meson/t9015.c | 9 ++++++---
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
index 7109b81cc3d0..211f360df284 100644
--- a/sound/soc/meson/aiu.c
+++ b/sound/soc/meson/aiu.c
@@ -209,6 +209,11 @@ static const char * const aiu_spdif_ids[] = {
 	[MCLK]	= "spdif_mclk_sel"
 };
 
+static void aiu_clk_disable(void *clk)
+{
+	clk_disable_unprepare(clk);
+}
+
 static int aiu_clk_get(struct device *dev)
 {
 	struct aiu *aiu = dev_get_drvdata(dev);
@@ -239,9 +244,7 @@ static int aiu_clk_get(struct device *dev)
 		return ret;
 	}
 
-	ret = devm_add_action_or_reset(dev,
-				       (void(*)(void *))clk_disable_unprepare,
-				       aiu->pclk);
+	ret = devm_add_action_or_reset(dev, aiu_clk_disable, aiu->pclk);
 	if (ret)
 		dev_err(dev, "failed to add reset action on pclk");
 
diff --git a/sound/soc/meson/t9015.c b/sound/soc/meson/t9015.c
index 9c6b4dac6893..e0f9a603a5e9 100644
--- a/sound/soc/meson/t9015.c
+++ b/sound/soc/meson/t9015.c
@@ -243,6 +243,11 @@ static const struct regmap_config t9015_regmap_config = {
 	.max_register		= POWER_CFG,
 };
 
+static void t9015_clk_disable(void *clk)
+{
+	clk_disable_unprepare(clk);
+}
+
 static int t9015_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -270,9 +275,7 @@ static int t9015_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = devm_add_action_or_reset(dev,
-			(void(*)(void *))clk_disable_unprepare,
-			priv->pclk);
+	ret = devm_add_action_or_reset(dev, t9015_clk_disable, priv->pclk);
 	if (ret)
 		return ret;
 
-- 
2.39.2