Re: [PATCH] ALSA: ac97: fix build regression

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Jan 03, 2024 at 11:25:38AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The ac97_bus_type structure is no longer declared in this file:
> 
> sound/ac97/bus.c: In function 'ac97_codec_add':
> sound/ac97/bus.c:112:27: error: 'ac97_bus_type' undeclared (first use in this function); did you mean 'bus_type'?
>   112 |         codec->dev.bus = &ac97_bus_type;
>       |                           ^~~~~~~~~~~~~
>       |                           bus_type
> sound/ac97/bus.c:112:27: note: each undeclared identifier is reported only once for each function it appears in
> sound/ac97/bus.c: In function 'snd_ac97_codec_driver_register':
> sound/ac97/bus.c:191:28: error: 'ac97_bus_type' undeclared (first use in this function); did you mean 'ac97_bus_reset'?
>   191 |         drv->driver.bus = &ac97_bus_type;
> 
> Include the header that contains the declaration and make sure the definition
> is const but not static.
> 
> Fixes: 66e82d219924 ("ALSA: mark all struct bus_type as const")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  sound/ac97/bus.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Ick, sorry about that, this didn't trigger in all of my build testing,
nor for 0-day, odd.

Anyway, thanks for the fix it is obviously correct:

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>