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[2603:8081:140c:1a00:1e0:e60:c33:b344]) by smtp.gmail.com with ESMTPSA id a5-20020a05680802c500b0034fd36e95bfsm3960219oid.31.2022.10.24.07.10.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Oct 2022 07:10:16 -0700 (PDT) Message-ID: Date: Mon, 24 Oct 2022 09:10:15 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Subject: Re: [PATCH for-next v3 1/2] RDMA/rxe: Remove unnecessary mr testing Content-Language: en-US To: Li Zhijian , zyjzyj2000@gmail.com, jgg@ziepe.ca, leon@kernel.org, linux-rdma@vger.kernel.org Cc: linux-kernel@vger.kernel.org References: <1666582315-2-1-git-send-email-lizhijian@fujitsu.com> From: Bob Pearson In-Reply-To: <1666582315-2-1-git-send-email-lizhijian@fujitsu.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,NICE_REPLY_A, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS 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 10/23/22 22:31, Li Zhijian wrote: > Before the testing, we already passed it to rxe_mr_copy() where mr could > be dereferenced. so this checking is not needed. > > The only way that mr is NULL is when it reaches below line 780 with > 'qp->resp.mr = NULL', which is not possible in Bob's explanation[1]. > > 778 if (res->state == rdatm_res_state_new) { > 779 if (!res->replay) { > 780 mr = qp->resp.mr; > 781 qp->resp.mr = NULL; > 782 } else { > > [1] https://lore.kernel.org/lkml/30ff25c4-ce66-eac4-eaa2-64c0db203a19@gmail.com/ > > CC: Bob Pearson > Signed-off-by: Li Zhijian > --- > V3: remove WARN_ON # Yanjun and Bob > --- > drivers/infiniband/sw/rxe/rxe_resp.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c > index ed5a09e86417..b02639cf8cba 100644 > --- a/drivers/infiniband/sw/rxe/rxe_resp.c > +++ b/drivers/infiniband/sw/rxe/rxe_resp.c > @@ -811,8 +811,7 @@ static enum resp_states read_reply(struct rxe_qp *qp, > > rxe_mr_copy(mr, res->read.va, payload_addr(&ack_pkt), > payload, RXE_FROM_MR_OBJ); > - if (mr) > - rxe_put(mr); > + rxe_put(mr); > > if (bth_pad(&ack_pkt)) { > u8 *pad = payload_addr(&ack_pkt) + payload; Reviewed-by: Bob Pearson