[openib-general] ib_cancel_mad and the CM

[Roland Dreier]

    Sean> This will allow locking around the cancel routine, which
    Sean> should fix the problem for the CM code.  However, I don't
    Sean> think that locking around the cancel routine eliminates the
    Sean> issue from the SA query code, but I also don't see a simple
    Sean> fix in that case.

Actually I think there is a simple fix for the SA that doesn't require
any changes to the MAD layer: just use the upper part of the wr_id to
hold a sequence number.  I'll post a patch later today.

 - R.