Can't configure Ethernet link status LED behaviour on IP4019 chipset and QCA8075 switch chip (OpenWRT v22.03.7)

[Cthulhu88]

Code can be read from https://www.godbolt.org/z/jaEj55MM6

In one of my later posts, you can see the mdio-tools equivalent to the "off" option: Ethernet LEDs control for TP-Link TL-WR1043ND v2/v3 - #4 by Cthulhu88

@seetheza

If the register value were being reset back to its former value by something else, then I would expect to see that value when I read the register again - but when I read the register value after setting it, I see the value that I configured remains unchanged (and therefore, I would have assumed, in effect!).

As mentioned in eth-leds.c header comment: Bus reads and writes are NOT atomic between ioctl calls.