If you added a bit of a delay (like a trace_printk) into the ISR for
the spi-geni-qcom driver, you would suddenly start seeing some errors
spit out. The problem was that, though the ISR itself held a lock,
other parts of the driver didn't always grab the lock.
One example race was this:
CPU0
Quoting Douglas Anderson (2020-06-18 08:06:23)
> If you added a bit of a delay (like a trace_printk) into the ISR for
> the spi-geni-qcom driver, you would suddenly start seeing some errors
> spit out. The problem was that, though the ISR itself held a lock,
> other parts of the driver didn't alwa
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