> Establish interrupt handlers with proper softc per each zs device
> rather than sharing them among all zs devices and searching softc
> in handlers.
>
> The latter method is derived from ancient sun3 zs driver which tried
> to reduce overhead on autovectored interrupts, but nowadays such hack
> might cause recursive global locks on modern SMP capable framework.
>
> Fixes "5.99.30 sparc panic during startup" reported by Hauke Fath
> on tech-kern@:
> http://mail-index.NetBSD.org/tech-kern/2010/06/19/msg008374.html
> and also tested by Jochen Kunz on SS20 with both serial and kbd console.
>
> Ok'ed by mrg@ and dyoung@.
Noticed by martin@.
e193fab21a