The fix for SWDEV-329789 moved down the last use of the a
command object pointer in order to prevent a race condition.
However, the previous patch did not move down the release of
that command. By releasing the command early, another thread
could get a command with the same pointer. That second thread
could later submit work to the queue using that new command.
The first thread could then perform a comparison against the
queue's last command using its own now-stale pointer. This
could eventually allow the second thread to skip synchornizing
on the queue. This would result in host synchronizations
completing before their device work was actually complete.
Change-Id: I292b7b369743251ceafe453a4c5cae14a6d01046
Joseph Greathouse
6b956f7627