[PATCH 01/16] pmac_zilog: fix unexpected irq

[Benjamin Herrenschmidt]

> Removing ifdefs makes the changes more invasive and the suspend/resume 
> code then has to be addressed, which I've avoided.
> 
> The suspend/resume code path can't be tested on m68k macs and the common 
> code paths I can't easily test on a powermac.
> 
> This patch should not be needed because the chip reset shouldn't leave the 
> tx and rx interrupts enabled. Those interrupts are explicitly enabled only 
> after request_irq(), so patching the master interrupt enable behaviour 
> should be redundant. But that's not the case in practice.
> 
> The chip reset code is already messy. I was inclined towards ifdefs and 
> reluctant to share more code after practical experience suggested possible 
> differences in the SCC/ESCC devices.
> 
> I guess I was hoping that the powermac maintainers might prefer ifdefs to 
> increased risk of destabilising the driver on powermacs...
> 
> But a more invasive patch would make for better code. I will see if I can 
> borrow a suitable PCI PowerMac.

Please do the more invasive patch, I'll beat it up on powermacs.

Cheers,
Ben.