Re: [PATCH] ALSA: aw2: avoid casting function pointers

[Takashi Iwai <tiwai@xxxxxxx>]

On Tue, 13 Feb 2024 11:13:19 +0100,
Arnd Bergmann wrote:
> 
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> clang-16 started warning about incompatible function pointers here:
> 
> sound/pci/aw2/aw2-alsa.c:363:11: error: cast from 'void (*)(struct snd_pcm_substream *)' to 'snd_aw2_saa7146_it_cb' (aka 'void (*)(void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>   363 |                                                     (snd_aw2_saa7146_it_cb)
>       |                                                     ^~~~~~~~~~~~~~~~~~~~~~~
>   364 |                                                     snd_pcm_period_elapsed,
>       |                                                     ~~~~~~~~~~~~~~~~~~~~~~
> sound/pci/aw2/aw2-alsa.c:392:10: error: cast from 'void (*)(struct snd_pcm_substream *)' to 'snd_aw2_saa7146_it_cb' (aka 'void (*)(void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>   392 |                                                    (snd_aw2_saa7146_it_cb)
>       |                                                    ^~~~~~~~~~~~~~~~~~~~~~~
>   393 |                                                    snd_pcm_period_elapsed,
>       |                                                    ~~~~~~~~~~~~~~~~~~~~~~
> 
> Add a forward declaration for struct snd_pcm_substrea to allow it to just
> use the correct prototype.
> 
> Fixes: 98f2a97f207a ("[ALSA] Emagic Audiowerk 2 ALSA driver.")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Thanks, applied.


Takashi