[bug report] ALSA: hda - Don't register a cb func if it is registered already

[Takashi Iwai]

On Wed, 21 Oct 2020 17:03:11 +0200,
Hui Wang wrote:
> 
> Looks like this will not bring problem on patch_sigmatel.c, NULL and
> valid kernel pointer are same for IS_ERR(), they will not make
> IS_ERR() come true.

Right, and it's called only once, so the bug doesn't hit.

But we should address the potential bug nevertheless, of course :)


thanks,

Takashi