px_dma_hdl_t
kmem_free(mp, sizeof (px_dma_hdl_t));
if ((mp = kmem_alloc(sizeof (px_dma_hdl_t), sleep)) == 0) {
mp = kmem_zalloc(sizeof (px_dma_hdl_t), KM_SLEEP);
kmem_free(mp, sizeof (px_dma_hdl_t));
kmem_free(mp, sizeof (px_dma_hdl_t));