ASC_SG_HEAD
memset(&ccb->sghead, 0, sizeof(ASC_SG_HEAD));
ASC_SG_HEAD sghead;
ASC_SG_HEAD *sg_head = scsiq->sg_head;
ASC_SG_HEAD *sg_head;
ASC_SG_HEAD *sg_head; /* pointer to SG list */
ASC_SG_HEAD *sg_head;
ASC_SG_HEAD *sg_head;