Is it appropriate to withhold or conceal the identity of a confidential informant in a search warrant affidavit?

In People v. Greenstreet (1990) 218 Cal.App.3d 1516, 267 Cal.Rptr. 377 the trial court redacted and sealed all parts of a search warrant affidavit that disclosed the identity of a confidential informant and gave defendant access to the remaining information. It was the sealed information that established probable cause to search. Relying on the literal language of section 1042, subdivision (b), and the holding in People v. Flannery (1985) 164 Cal.App.3d 1112, 1118-1120, 210 Cal.Rptr. 899, the reviewing court held that it was proper to withhold from the defendant the facts in the affidavit establishing probable cause to search without being compelled to issue a suppression order. (People v. Greenstreet, supra, 218 Cal.App.3d at pp. 1518-1520, 267 Cal.Rptr. 377.)