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[142.162.113.129]) by smtp.gmail.com with ESMTPSA id o11-20020ac8554b000000b002f3ca56e6edsm625334qtr.8.2022.05.17.05.16.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 May 2022 05:16:47 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1nqw86-007z0H-QE; Tue, 17 May 2022 09:16:46 -0300 Date: Tue, 17 May 2022 09:16:46 -0300 From: Jason Gunthorpe To: Haowen Bai Cc: Dennis Dalessandro , Leon Romanovsky , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] RDMA: remove null check after call container_of() Message-ID: <20220517121646.GE63055@ziepe.ca> References: <1652751208-23211-1-git-send-email-baihaowen@meizu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1652751208-23211-1-git-send-email-baihaowen@meizu.com> X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 17, 2022 at 09:33:28AM +0800, Haowen Bai wrote: > container_of() will never return NULL, so remove useless code. It is confusing here, but it can be null. If you want to do this then you have to split out the _ib_alloc_device call and check it seperately. Jason