[RFC v2 31/39] sound: add HAS_IOPORT dependencies

[Arnd Bergmann]

On Mon, May 9, 2022 at 10:53 AM Takashi Iwai <tiwai at suse.de> wrote:
> On Fri, 29 Apr 2022 15:50:54 +0200, Niklas Schnelle wrote:

> >
> >  config SND_OPL3_LIB
> >       tristate
> > +     depends on HAS_IOPPORT
> >       select SND_TIMER
> >       select SND_HWDEP
> >       select SND_SEQ_DEVICE if SND_SEQUENCER != n
>
> Both of those are the items to be reverse-selected, so cannot fulfill
> the dependency with depends-on.  That is, the items that select those
> should have the dependency on HAS_IOPORT instead.
>
> That is, a change like below:
>
> > --- a/sound/isa/Kconfig
> > +++ b/sound/isa/Kconfig
> > @@ -31,7 +31,7 @@ if SND_ISA
> >
> >  config SND_ADLIB
> >       tristate "AdLib FM card"
> > -     select SND_OPL3_LIB
> > +     depends on SND_OPL3_LIB
>
> ... won't work.  CONFIG_SND_OPL3_LIB is not enabled by itself but only
> to be selected.

Right, I missed that in my review. Not sure if this was a mistake in
my original patch or if it started in a later version.

I think for the ISA drivers, I would still add 'depends on HAS_IOPORT'
to both CONFIG_SND_ISA and CONFIG_SND_OPL3_LIB if only to
make it easier to understand, even though CONFIG_ISA requires
HAS_IOPORT already, and CONFIG_SND_OPL3_LIB cannot be
selected by itself.

For the PCI drivers, I think we need to add the same dependency
on anything that either selects SND_OPL3_LIB or calls inb()/outb()
directly.

       Arnd