[PATCH] Prevent legacy io access on pmac

[Benjamin Herrenschmidt]

On Mon, 2006-09-11 at 13:53 +0200, Olaf Hering wrote:
> The ppc32 common config runs also on PReP/CHRP, which uses PC style IO
> devices.  The probing is bogus, it crashes or floods dmesg.
> 
> ppc can boot one single binary on prep, chrp and pmac boards.
> ppc64 can boot one single binary on pseries and G5 boards.
> pmac has no legacy io, probing for PC style legacy hardware leads to a
> hard crash:
> 
> * add check for parport_pc, exit on pmac.
> 32bit chrp has no ->check_legacy_ioport, the probe is always called.
> 64bit chrp has check_legacy_ioport, check for a "parallel" node
> 
> * add check for isapnp, only PReP boards may have real ISA slots.
> 32bit PReP will have no ->check_legacy_ioport, the probe is always called.
> 
> * update code in i8042_platform_init. Run ->check_legacy_ioport first, always
> call request_region. No functional change. Remove whitespace before i8042_reset init.
> 
> 
> Signed-off-by: Olaf Hering <olaf at aepfle.de>

Looks good to me.

Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>