[PATCH v2] nvmem: meson-efuse: fix function pointer type mismatch

[PATCH v2] nvmem: meson-efuse: fix function pointer type mismatch

[Jerome Brunet]

clang-16 warns about casting functions to incompatible types, as is done
here to call clk_disable_unprepare:

drivers/nvmem/meson-efuse.c:78:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
   78 |                                        (void(*)(void *))clk_disable_unprepare,

The pattern of getting, enabling and setting a disable callback for a
clock can be replaced with devm_clk_get_enabled(), which also fixes
this warning.

Fixes: 611fbca1c861 ("nvmem: meson-efuse: add peripheral clock")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 drivers/nvmem/meson-efuse.c | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
index b922df99f9bc..33678d0af2c2 100644
--- a/drivers/nvmem/meson-efuse.c
+++ b/drivers/nvmem/meson-efuse.c
@@ -47,7 +47,6 @@ static int meson_efuse_probe(struct platform_device *pdev)
 	struct nvmem_config *econfig;
 	struct clk *clk;
 	unsigned int size;
-	int ret;
 
 	sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
 	if (!sm_np) {
@@ -60,27 +59,9 @@ static int meson_efuse_probe(struct platform_device *pdev)
 	if (!fw)
 		return -EPROBE_DEFER;
 
-	clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(clk)) {
-		ret = PTR_ERR(clk);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "failed to get efuse gate");
-		return ret;
-	}
-
-	ret = clk_prepare_enable(clk);
-	if (ret) {
-		dev_err(dev, "failed to enable gate");
-		return ret;
-	}
-
-	ret = devm_add_action_or_reset(dev,
-				       (void(*)(void *))clk_disable_unprepare,
-				       clk);
-	if (ret) {
-		dev_err(dev, "failed to add disable callback");
-		return ret;
-	}
+	clk = devm_clk_get_enabled(dev, NULL);
+	if (IS_ERR(clk))
+		return dev_err_probe(dev, PTR_ERR(clk), "failed to get efuse gate");
 
 	if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
 		dev_err(dev, "failed to get max user");
-- 
2.43.0


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Re: [PATCH v2] nvmem: meson-efuse: fix function pointer type mismatch

[Arnd Bergmann]

On Tue, Feb 13, 2024, at 15:28, Jerome Brunet wrote:
> clang-16 warns about casting functions to incompatible types, as is done
> here to call clk_disable_unprepare:
>
> drivers/nvmem/meson-efuse.c:78:12: error: cast from 'void (*)(struct 
> clk *)' to 'void (*)(void *)' converts to incompatible function type 
> [-Werror,-Wcast-function-type-strict]
>    78 |                                        (void(*)(void 
> *))clk_disable_unprepare,
>
> The pattern of getting, enabling and setting a disable callback for a
> clock can be replaced with devm_clk_get_enabled(), which also fixes
> this warning.
>
> Fixes: 611fbca1c861 ("nvmem: meson-efuse: add peripheral clock")
> Reported-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

Perfect, much nicer than my version.

Acked-by: Arnd Bergmann <arnd@arndb.de>

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Re: [PATCH v2] nvmem: meson-efuse: fix function pointer type mismatch

[Martin Blumenstingl]

On Tue, Feb 13, 2024 at 3:28 PM Jerome Brunet <jbrunet@baylibre.com> wrote:
>
> clang-16 warns about casting functions to incompatible types, as is done
> here to call clk_disable_unprepare:
>
> drivers/nvmem/meson-efuse.c:78:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>    78 |                                        (void(*)(void *))clk_disable_unprepare,
>
> The pattern of getting, enabling and setting a disable callback for a
> clock can be replaced with devm_clk_get_enabled(), which also fixes
> this warning.
>
> Fixes: 611fbca1c861 ("nvmem: meson-efuse: add peripheral clock")
> Reported-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

Thanks Jerome!

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Re: [PATCH v2] nvmem: meson-efuse: fix function pointer type mismatch

[Justin Stitt]

Hi,

On Tue, Feb 13, 2024 at 6:28 AM Jerome Brunet <jbrunet@baylibre.com> wrote:
>
> clang-16 warns about casting functions to incompatible types, as is done
> here to call clk_disable_unprepare:
>
> drivers/nvmem/meson-efuse.c:78:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>    78 |                                        (void(*)(void *))clk_disable_unprepare,
>
> The pattern of getting, enabling and setting a disable callback for a
> clock can be replaced with devm_clk_get_enabled(), which also fixes
> this warning.
>
> Fixes: 611fbca1c861 ("nvmem: meson-efuse: add peripheral clock")
> Reported-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
> ---
>  drivers/nvmem/meson-efuse.c | 25 +++----------------------

I love negative diffs                                    ^^^^^^^^^^^^^^^

>  1 file changed, 3 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/nvmem/meson-efuse.c b/drivers/nvmem/meson-efuse.c
> index b922df99f9bc..33678d0af2c2 100644
> --- a/drivers/nvmem/meson-efuse.c
> +++ b/drivers/nvmem/meson-efuse.c
> @@ -47,7 +47,6 @@ static int meson_efuse_probe(struct platform_device *pdev)
>         struct nvmem_config *econfig;
>         struct clk *clk;
>         unsigned int size;
> -       int ret;
>
>         sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
>         if (!sm_np) {
> @@ -60,27 +59,9 @@ static int meson_efuse_probe(struct platform_device *pdev)
>         if (!fw)
>                 return -EPROBE_DEFER;
>
> -       clk = devm_clk_get(dev, NULL);
> -       if (IS_ERR(clk)) {
> -               ret = PTR_ERR(clk);
> -               if (ret != -EPROBE_DEFER)
> -                       dev_err(dev, "failed to get efuse gate");
> -               return ret;
> -       }
> -
> -       ret = clk_prepare_enable(clk);
> -       if (ret) {
> -               dev_err(dev, "failed to enable gate");
> -               return ret;
> -       }
> -
> -       ret = devm_add_action_or_reset(dev,
> -                                      (void(*)(void *))clk_disable_unprepare,
> -                                      clk);
> -       if (ret) {
> -               dev_err(dev, "failed to add disable callback");
> -               return ret;
> -       }
> +       clk = devm_clk_get_enabled(dev, NULL);
> +       if (IS_ERR(clk))
> +               return dev_err_probe(dev, PTR_ERR(clk), "failed to get efuse gate");

Wow, this simplified nicely and doesn't make any new helpers (like
Arnd's version).

Reviewed-by: Justin Stitt <justinstitt@google.com>

>
>         if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
>                 dev_err(dev, "failed to get max user");
> --
> 2.43.0
>

Thanks
Justin

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Re: [PATCH v2] nvmem: meson-efuse: fix function pointer type mismatch

[Srinivas Kandagatla]

On Tue, 13 Feb 2024 15:28:28 +0100, Jerome Brunet wrote:
> clang-16 warns about casting functions to incompatible types, as is done
> here to call clk_disable_unprepare:
> 
> drivers/nvmem/meson-efuse.c:78:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>    78 |                                        (void(*)(void *))clk_disable_unprepare,
> 
> The pattern of getting, enabling and setting a disable callback for a
> clock can be replaced with devm_clk_get_enabled(), which also fixes
> this warning.
> 
> [...]

Applied, thanks!

[1/1] nvmem: meson-efuse: fix function pointer type mismatch
      commit: 6b475e23544a560b4bf2acfab8dc54c4e7b1749e

Best regards,
-- 
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>


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