[PATCH] ASoC: meson: add helpers for clk_disable_unprepare

Arnd Bergmann
2024-02-13T10:12:47Z

From: Arnd Bergmann <arnd@arndb.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@arndb.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