iw_cxgb4: don't block in destroy_qp awaiting the last deref
Blocking in c4iw_destroy_qp() causes a deadlock when apps destroy a qp or disconnect a cm_id from their cm event handler function. There is no need to block here anyway, so just replace the refcnt atomic with a kref object and free the memory on the last put. Signed-off-by: NSteve Wise <swise@opengridcomputing.com> Reviewed-by: NSagi Grimberg <sagi@grimberg.me> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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