rtio: Callback chaining and testing #72765
Open
+221
−116
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Callbacks were a bit neglected in terms of test coverage, especially when used in chains. It was clear from the code that chained callbacks may not actually work, and callback ordering then was hard to verify. Test callbacks chained to transactions work as expected.
The test iodev had built up some cruft over time and in the process showed a few bugs once callback chaining was fixed so the test iodev now better matches typical iodev implementations at this point.
Fixes #72740