Re: [PATCH] pcm: rate: Add capability to pass configuration node to plugins

[Alan Young <consult.awy@gmail.com>]

On 08/02/17 15:36, Takashi Iwai wrote:
> can't change the existing function definition.  This will be broken
> once you mix the old version of plugin with the new system or vice
> versa.
I had concluded that changing the type signature was in this case safe. 
There is no (public) declaration of _snd_pcm_rate_/xxx/_open() function 
type and I think that passing unexpected additional parameters is a 
function is always safe.

However ...
> Alternatively, try to provide another function
> _snd_pcm_rate_xxx_open_conf() or such.  In addition, you should
> provide the old open function as is for now, too.
> Then the rate plugin can try to get and open via snd_dlobj_cache_get()
> for the open_conf at first, then fall back to the old open function.
I like this more. It is cleaner in some ways and avoids the need to bump 
the version number.

I'll work up a revised patch.

Thanks,
Alan.