On Tue 13 Feb 2024 at 11:11, Arnd Bergmann arnd@kernel.org wrote:

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);

Hi Arnd,

This probably pre-dates the introduction of devm_clk_get_enabled() It would probably be better to use that instead of duplicating helper functions which do the same thing.

If for any reason it is not possible, a common helper in clk.h would preferable I think.

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;