Review request -- splitting OF enumeration from nexus
jhb at freebsd.org
Fri Nov 5 13:02:51 UTC 2010
On Friday, November 05, 2010 7:07:28 am Marius Strobl wrote:
> On Sun, Oct 31, 2010 at 03:44:15PM -0500, Nathan Whitehorn wrote:
> > Nexus on OF platforms doesn't behave like nexus on x86, which generates
> > some periodic difficulty with cryptosoft or syscons attaching to all
> > devices and taking over the system when someone makes a wrong
> > assumption.
> I think this is an exaggeration of the problem; the only relevant
> difference in this regard should be that on x86 there are no
> (unattached) non-pseudo-devices on the nexus, while on powerpc and
> sparc64 (apparently this also applies to the embedded architectures
> though) there are real devices where a buggy pseudo-driver like
> cryptosoft(4) has a chance to attach to. AFAICT cryptosoft(4) also
> is the only MI driver suffering from this and can be easily fixed
> by letting it add its pseudo-device with a specific unit number and
> return BUS_PROBE_NOWILDCARD. The syscons(4) front-end you are
> referring to is a powerpc MD part and the sparc64 counterpart never
> had that problem.
Actually, I think the fix for cryptosoft is that it doesn't belong in new_bus
at all. It simply needs to supply a kobj that implements the crypto-related
methods, but all the new-bus stuff isn't actually needed.
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