> …
> > the close(x) seems to always take 30s now.. ttyS0 is fine..
> >
> > why could that be?
>
> it might want to wait until the FIFO is empty again. No clue. Do you see
> interrupts coming? By setting the IRQ number to 0 (or using the patch
> attached) it would use timer-base polling instead waiting for the
> interrupt.
yes, after setting IRQ to 0 using setserial, it seems to return to normal..
but still it's a bug I guess? Also polling will consume some CPU time, especially
with many serial devices?
BR
nik
>
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -335,7 +335,7 @@ static int univ8250_setup_irq(struct uart_8250_port *up)
> * hardware interrupt, we use a timer-based system. The original
> * driver used to do this with IRQ0.
> */
> - if (!port->irq) {
> + if (1) {
> mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
> } else
> retval = serial_link_irq_chain(up);
> @@ -349,7 +349,7 @@ static void univ8250_release_irq(struct uart_8250_port *up)
>
> del_timer_sync(&up->timer);
> up->timer.function = serial8250_timeout;
> - if (port->irq)
> + if (0)
> serial_unlink_irq_chain(up);
> }
>
> > nik
>
> Sebastian
>
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