[Bug 218597] [CRYPTODEV] spurious wakeup and synchronisation problem

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218597

--- Comment #7 from John Baldwin <jhb at FreeBSD.org> ---
(In reply to Alexandre martins from comment #5)
Well, hmm.  If the uio is in the csession than perhaps we should just formalize
"only one op at a time" by having the crypto ioctls detect that case and either
fail or block.  Alternatively we could move the uio into the 'cod'.  Probably
it is simpler to just enforce "one op at a time" and then your original patch
should work I think.

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