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Mon, 21 Mar 2022 00:15:40 -0700 (PDT) Received: from localhost ([139.177.225.230]) by smtp.gmail.com with ESMTPSA id f66-20020a62db45000000b004fa8a7b8ad3sm5744420pfg.77.2022.03.21.00.15.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Mar 2022 00:15:39 -0700 (PDT) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, kwolf@redhat.com, mreitz@redhat.com, mlureau@redhat.com, jsnow@redhat.com Subject: [PATCH v3 1/6] block: Support passing NULL ops to blk_set_dev_ops() Date: Mon, 21 Mar 2022 15:14:34 +0800 Message-Id: <20220321071439.151-2-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220321071439.151-1-xieyongji@bytedance.com> References: <20220321071439.151-1-xieyongji@bytedance.com> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::62e (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=xieyongji@bytedance.com; helo=mail-pl1-x62e.google.com X-Spam_score_int: -4 X-Spam_score: -0.5 X-Spam_bar: / X-Spam_report: (-0.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This supports passing NULL ops to blk_set_dev_ops() so that we can remove stale ops in some cases. Signed-off-by: Xie Yongji --- block/block-backend.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/block-backend.c b/block/block-backend.c index e0e1aff4b1..35457a6a1d 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -1062,7 +1062,7 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, blk->dev_opaque = opaque; /* Are we currently quiesced? Should we enforce this right now? */ - if (blk->quiesce_counter && ops->drained_begin) { + if (blk->quiesce_counter && ops && ops->drained_begin) { ops->drained_begin(opaque); } }