[parisc-linux] panic while "set serial" with 2.4.20-pa9

[Paul Bame]

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It's probably not the new kernel. setserial is quite dangerous and
bypasses any driver-related safety.  I often disable or remove it on
development machines and it's often fatal after a serial configuration
change.

The two places I've suffered are when I removed serial ports and
rebooted, and when I booted a second machine (with different port setup)
from a disk made from the first machine.  In both cases setserial tried
to restore settings using addresses which didn't exist --> panic.

	-P