Re: UART/TTY console deadlock

[Sergey Senozhatsky]

On (20/07/08 09:40), Kurt Kanzenbach wrote:
> I'm not sure how this patch will help with the situation. Because at the
> point of that THRE test the irq handler isn't registered. It's
> registered a few lines below (up->ops->setup_irq()) meaning the irq line
> has to be disabled if shared. Otherwise the kernel might detect a
> spurious irq and disables it. That's at least my understanding of the
> problem (see commit message from 54e53b2e8081 ("tty: serial: 8250: pass
> IRQ shared flag to UART ports")).

So the only remaining approach then is to move
disable_irq_nosync()/enable_irq() out of port->lock
scope.

	-ss