[Ocf-linux-users] patch for OCF

[hwang7 <hua...@wi...>]

Hi david

When using cryptosoft of OCF to do the crypto and run test scripts which 
includes the following commands on SMP platform(we do the test on 
fsl_p4080 which is a SMP processor with 8 cores):

$ openssl speed -evp des -engine cryptodev -elapsed -multi 10
$ openssl speed -evp des3 -engine cryptodev -elapsed -multi 10
$ openssl speed -evp aes128 -engine cryptodev -elapsed -multi 10

The system will give out call trace or hang.

The root causes of this issue is:
The swcr_sessions is not protected properly, and the three
types of session operation "create session, use session, delete
session" are also not protected properly.

So:
1.add spin lock to protect swcr_sessions
2.add state/ref fields to session, use session state to prevent from
deleting a session when it's in creating or using state, and use spin
lock to protect the session state.


-- 
Best Regards
========================
Wang Huanhuan
Work phone:  +86-10-8477-8568