[PATCH] mmc: meson-mx-sdhc: Avoid cast to incompatible function type

[Neil Armstrong]

On 10/05/2023 14:39, Simon Horman wrote:
> Rather than casting mmc_free_host to an incompatible function type,
> provide a trivial wrapper with the correct signature for the use-case.
> 
> Reported by clang-16 with W=1:
> 
>   .../meson-mx-sdhc-mmc.c:791:38: error: cast from 'void (*)(struct mmc_host *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>           ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
>                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   ./include/linux/device.h:265:38: note: expanded from macro 'devm_add_action_or_reset'
>           __devm_add_action_or_reset(release, action, data, #action)
>                                              ^~~~~~
> 
> The same approach is taken in litex_mmc.c with the function
> litex_mmc_free_host_wrapper(). There may be scope for consolidation.
> 
> No functional change intended.
> Compile tested only.
> 
> Signed-off-by: Simon Horman <horms at kernel.org>
> ---
>   drivers/mmc/host/meson-mx-sdhc-mmc.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/meson-mx-sdhc-mmc.c b/drivers/mmc/host/meson-mx-sdhc-mmc.c
> index da85c2f2acb8..97168cdfa8e9 100644
> --- a/drivers/mmc/host/meson-mx-sdhc-mmc.c
> +++ b/drivers/mmc/host/meson-mx-sdhc-mmc.c
> @@ -776,6 +776,11 @@ static void meson_mx_sdhc_init_hw(struct mmc_host *mmc)
>   	regmap_write(host->regmap, MESON_SDHC_ISTA, MESON_SDHC_ISTA_ALL_IRQS);
>   }
>   
> +static void meason_mx_mmc_free_host(void *data)
> +{
> +       mmc_free_host(data);
> +}
> +
>   static int meson_mx_sdhc_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> @@ -788,8 +793,7 @@ static int meson_mx_sdhc_probe(struct platform_device *pdev)
>   	if (!mmc)
>   		return -ENOMEM;
>   
> -	ret = devm_add_action_or_reset(dev, (void(*)(void *))mmc_free_host,
> -				       mmc);
> +	ret = devm_add_action_or_reset(dev, meason_mx_mmc_free_host, mmc);
>   	if (ret) {
>   		dev_err(dev, "Failed to register mmc_free_host action\n");
>   		return ret;
> 

Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>