Re: [RFC PATCH] ALSA: core: Add DMA share buffer support

[Baolin Wang]

On Fri, 25 Jan 2019 at 21:04, Takashi Iwai <tiwai@xxxxxxx> wrote:
> > >
> > > Erm, obviously it's not enough.  Each attach / detach needs to manage
> > > the refcount, too, for covering the cases above.  It can re-use the
> > > PCM mmap_refount, though.
> >
> > But we've used the DMA buffer file's refcounting to manage the DMA
> > buffer. So is this not enough?
>
> Unless you manage the PCM substream refcount (or block the state
> change), the PCM stream itself can be released (or re-setup) freely.
>

OK. Thanks for your comments.

-- 
Baolin Wang
Best Regards