Re: Q serial.c

Stuart MacDonald (stuartm@connecttech.com)
Fri, 22 Jun 2001 09:51:18 -0400

From: "kees" <kees@schoen.nl>
> 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.

..Stu

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