iscsi: rev 05 2.5.1 requires ACA support

[Ralph Weber <ralphoweber@compuserve.com>]

The following two 2.5.1 statements require the use
of ACA and there is no way for an initiator that
doesn't implement ACA to stop them.

   For the <Clear Task Set>, ...
   The target MUST then enter the ACA state for any
   initiator for which it had pending tasks.

   In addition, for the <Target Warm Reset> the target
   enters the ACA state on all sessions and all LUs on
   which an AE was sent.

Have you all signed the operating system vendors up for
rewrites of their class drivers to support ACA?  If not
anticipate some serious deadlocks when iSCSI is first
attempted with a non ACA class driver, since the driver
will never clear these ACA conditions and no progress
will be made after that.

Alternatively, a way can be found to give the initiator
control over the "MUST" statements.

Thanks.

Ralph...