Re: [RFC PATCH v2 1/3] resource: Request IO port regions from children of ioport_resource

[John Garry]

On 29/03/2019 12:22, Lorenzo Pieralisi wrote:
> > > > >Side note: these drivers can't be compiled on PPC, it would be
> > > > >good to understand why, I have a hunch it can be related.
> > >
> > > I mentioned this earlier:
> > >
> > > I saw that in commits like 746cdfbf01c0 ("hwmon: Avoid building drivers
> > > forpowerpc that read/write ISA addresses"), PPC would not build these
> > > drivers, as, like arm, it has no native ISA.
> > >
> > > However I still don't think just avoiding compiling these drivers for
> > > certain archs solves the problem.
> No it does not but I would like to understand how relevant is fixing
> those drivers (that should not use ISA IO space without first claiming
> their resources, for the records) given that PPC did not even try and
> apparently that's not a problem.

Hi Lorenzo,

Those drivers should still be fixed up separately.

The tricky part in this series is making the resource claim fail if 
there is no IO space mapped/accessible at the addresses requested.

However I would still like to fix up the low level IO port accessors to 
discard accesses when no IO space is mapped.

Thanks,
John

> > >
> > > [...]
> > >
> > > > > > > > >>>>>[1] https://www.spinics.net/lists/linux-pci