TL;DR Why use a recursive mutex when you can emulate it with code that doesn't actually work?https://twitter.com/RichFelker/status/756243383279058944 …
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To be fair, the bug was slightly different from what I described it as, but the maintainer has a nice fix! http://marc.info/?l=linux-spi&m=146914274826762&w=2 …
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OH WOW THIS EXPLAINS SO MUCH. Like why I could never get SPI timings to reliably work on Linux feeding an ADC (on BBlack & RPi).
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but the same task running directly on a bloody ATTiny, no joke, worked flawlessly.
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