SAN FRANCISCO — A federal judge has barred IP litigator Morgan Chu and others at Irell & Manella from going up against former client Radware in a Northern District of California patent case.

In a seven-page order issued Wednesday, U.S. District Judge Ronald Whyte granted Radware’s motion to disqualify Irell from representing A10 Networks, a rival in the networking industry. Radware argued that the law firm had confidential information about its products, financing and decision making after representing the company in two matters.