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drivers/gpio PCA9555 - epoll_wait(2) misses first irq after setting an irq mask... #673

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drivers/gpio PCA9555 - epoll_wait(2) misses first irq after setting an irq mask... #673

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Commits on May 3, 2019

  1. When ones changes the state of any input pins of a PCA9555 chip befor… 

    …e setting up the IRQ mask through i.e. SysFS e.g.

echo "both" > /sys/class/gpio/gpioXYZ/edge the epoll_wait shall not exit on the subsequent change of the GPIO state.
The reason behind it is that the IRQ status is not being saved when the IRQ is masked.
    Tomasz Kazimierz Motyl committed May 3, 2019
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