SGDescriptor
struct SGDescriptor *chain_sg, *chain_block;
struct SGDescriptor *chain_sg;
static void hpsa_set_sg_descriptor(struct SGDescriptor *desc,
struct SGDescriptor *curr_sg;
struct SGDescriptor *curr_sg;
struct SGDescriptor **cmd_sg_list;
struct SGDescriptor SG[SG_ENTRIES_IN_CMD];
struct SGDescriptor SG[IOACCEL1_MAXSGENTRIES];