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ipipe-arm64
Florian Bezdeka
authored
Hardware IRQs are enabled here, e.g. when coming from irq_finalize_oneshot()! It might happen that right after enabling the IRQ at hardware level the IRQ comes in again, even before we could fix the software IRQ state flag. The result was a IRQ storm and system freeze because the same IRQ was not properly masked at hw level during next IRQ arrival. The software IRQ flag is checked before going down to the HW level. Switching to unmask_irq() has two effects: - We do not have to care about the software IRQ state flag anymore - IRQ state is updated in a hwirq off section together with the hw state, so the software state flag and hw state should no longer diverge. Link: https://lore.kernel.org/xenomai/20220210153313.2229625-1-gunter.grau@philips.com/ Signed-off-by: Florian Bezdeka <florian.bezdeka@siemens.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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