Re: [PATCH] serial: 8250 check iir rdi in interrupt

[Alan Cox]

> Added module parameter skip_rdi_check to opt out this workaround.

NAK. Anything like this should be runtime.

> Tested on Radisys ATCA 46XX which uses FPGA 16550-compatible and
> other generic 16550 UART. It takes from an hour to days to reproduce by
> pumping inputs to serial console continously using TeraTerm script:

You turn this on by default but it's a nasty IRQ latency penalty
on a lot of x86 platforms with the uarts on the lpc bus.

What I am not clear on from this is

- do you see it on both the ports (the bug that is)
- if you do see it on both are you sure its not in reality a symptom of
  some other console/irq handling race ?

Alan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/