Re: 2.5.45 odd deref in serial_in

[Zwane Mwaikambo]

On Tue, 5 Nov 2002, Russell King wrote:

> static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
> {
>         offset <<= up->port.regshift;
> 
>         switch (up->port.iotype) {
> 
> which also dereferences "up".  So something may have corrupted %ebx
> between executing that switch statement and executing the inb().
> 
> Could the NMI handler be corrupting %ebx ?

Yes that is highly likely, my current NMI handler does a fair amount of 
work, however it chains from the current default nmi handler, i thought 
register saving was already taken care of otherwise wouldn't i have all 
sorts of other strange bugs creeping up?

	Zwane
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