At 9:51 AM -0400 2001-06-22, Stuart MacDonald wrote:
>From: "kees" <[EMAIL PROTECTED]>
>> What may happen on a SMP machine if a serial port has been closed and the
>> closing stage is at shutdown() in serial.c in the call to free_IRQ and
>> BEFORE the IRQ is really shutdown, a new character arrives which causes an
>> IRQ? Is it possible that the OTHER cpu takes this interrupt and causes a
>> crash?
>
>I'm looking at serial-5.05/serial.c. You'll notice at the
>beginning of shutdown the saveflags(); cli(); calls.
>This disables interrupts. The uart will not be able to
>generate IRQs even if new characters arrive.
The other CPU servicing the interrupt, was the question. cli()
doesn't affect that. This could presumably happen if shutdown() gets
run on a non-interrupt-servicing CPU, or if interrupts are
dynamically routed (eg round-robin).
Where can I find the 5.05 driver?
--
/Jonathan Lundell.
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