[Drbd-dev] [DRBD-8.0 PATCH] Ensure that state updates cannot be done out of order whilst running receive_state

[Graham, Simon]

There have been a number of issues uncovered with race conditions during
receive_state plus the patch I submitted earlier that moves all
after_state_processing introduced one new one (since previously the
after_state_ch call was done inline in receive_state in the right place
and now it happens asynchronously). The attached patch addresses races
during receive_state by acquiring the data.mutex whilst receive_state is
running - this ensures that messages are sent to the peer in the right
order.

Simon
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