> > Is this warning specific to any linux version? > > In theory, no. I only tested 5.0, 4.20, both can reproduce this warning. > This makes me think that code is fine because it occurs in 4.20 and greater. Or maybe the problem is masked in older. I maybe wrong in assuming that. > > The warning comes from calling generic_handle_irq() in usb tasklet context. > This is not correct. > > Per my understanding, if there's chained irq, we could introduce extra > irqdomain. E.g > > GIC <--> another irqchip controller <--> HW device > Correct, IRQ domain is generally used in chained irq controllers. Yes, We need to check why irq domain is used in the current driver. Thanks
