*  - SCp.phase records this command's SRCID_ER bit setting
  */
 
-       if (cmd->use_sg) {
-               cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
-               cmd->SCp.buffers_residual = cmd->use_sg - 1;
+       if (scsi_bufflen(cmd)) {
+               cmd->SCp.buffer = scsi_sglist(cmd);
+               cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
                cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
                cmd->SCp.this_residual = cmd->SCp.buffer->length;
        } else {
                cmd->SCp.buffer = NULL;
                cmd->SCp.buffers_residual = 0;
-               cmd->SCp.ptr = (char *) cmd->request_buffer;
-               cmd->SCp.this_residual = cmd->request_bufflen;
+               cmd->SCp.ptr = NULL;
+               cmd->SCp.this_residual = 0;
        }
        cmd->SCp.have_data_in = 0;