Messages in this thread | | | From | Sergey Senozhatsky <> | Date | Wed, 8 Jul 2020 17:07:12 +0900 | Subject | Re: UART/TTY console deadlock |
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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
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