On Wed, 2011-12-07 at 14:49 +1100, Finn Thain wrote: > On most 68k Macs the SCC IRQ is an autovector interrupt and cannot be > masked. This can be a problem when pmac_zilog starts up. > > For example, the serial debugging code in arch/m68k/kernel/head.S may be > used beforehand. It disables the SCC interrupts at the chip but doesn't > ack them. Then when a pmac_zilog port is used, the machine locks up with > "unexpected interrupt". > > This can happen in pmz_shutdown() since the irq is freed before the > channel interrupts are disabled. > > Fix this by clearing interrupt enable bits before the handler is > uninstalled. Also move the interrupt control bit flipping into a separate > pmz_interrupt_control() routine. Replace all instances of these operations > with calls to this routine. Omit the zssync() calls that seem to serve no > purpose. > > Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> > Acked-by: Alan Cox <alan@xxxxxxxxxxxxxxx> > > --- So basic operations seem to work, I've applied the patch to powerpc-next. However, the internal modem on my Pismo powerbook doesn't appear to survive suspend/resume. I'll dig into that and merge a fixup patch asap. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
