Re: 2.5.45 odd deref in serial_in

Zwane Mwaikambo (zwane@holomorphy.com)
Tue, 5 Nov 2002 09:30:10 -0500 (EST)


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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function.linuxpower.ca

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