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Internal Questions

mutex_lock_interruptible(..) instead of mutex_lock(..)? Yes, since ...
tips to detect memory leaks of flying urbs? See https://www.kernel.org/doc/html/latest/dev-tools/kmemleak.html#kernel-memory-leak-detector
Detection of ZLP (Zero length packages) possible?
suspend/resume: How do we deal with current IO traffic?
TODO: assign POLLPRI to SRQ, and assign POLLIN|POLLRDNORM to normal read data!! Can we exchange the event flags and break existing applications? Yes, Dave would be ok with the new Definition.
How shall we deal with subsequent asynchronous calls (usbtmc_generic_write/read)?
Which timeout error should be used ETIME or ETIMEDOUT?
- Much more drivers are using ETIMEDOUT
- Which timeout values are allowed 0..MAX_SCHEDULE_TIMEOUT (-1)