mss.c pcm fix to ' attach returned 6 ' load failure for v5.x
acpi and up
M. Warner Losh
imp at bsdimp.com
Sat Jul 16 19:19:00 GMT 2005
<the refs are wrong for this reply>
Nate writes:
> I really think the driver is broken and the API is fine for this. I
> don't like the hack of returning a random CID for checks against the
> HID. Drivers down the road may come to rely on this and then every BIOS
> that has a different order for CIDs becomes a potential breakage point.
They alredy do rely on this. When they support pnp, they call the
ISA_PNP_PROBE routine. When they don't then your observation doesn't
matter because the order of the IDs doesn't matter: their non-zeroness
does.
> Drivers should not rely on isa_get_logicalid() to determine a boolean
> "is PNP?"
Actually, that's the interface. We have to follow it, even if you
think it is stupid. It is how we do things. When we don't have a
logicalid, we return 0. When drivers don't support pnp devices, it
uses the existance of a non-zero pnpid to know the device isn't for
them. It has been this way since 3.0.
Warner
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