Workqueue behaviour - Synchronization within submitted work.

[Vijay]

In the new workqueue architecture, I have a question regarding
synchronization between different "work" submitted to the same
workqueue. For example:

* I submit two "works" A and B to a common driver specific workqueue (W).
* Each A and B, meddle with a certain shared data SD.
* Am I guaranteed serialized execution of A and B, or should I play
safe and use a semaphore (acquire/release) with A and B ?

Thanks,
Vijay
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