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[81.108.45.148]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48c71d04c0fsm11395902f8f.10.2026.10.08.07.12.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2026 07:12:23 -0700 (PDT) From: Prathamesh Deshpande To: Leon Romanovsky , Jason Gunthorpe Cc: Prathamesh Deshpande , Doug Ledford , Haggai Eran , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH rdma] RDMA/mlx5: Cancel software CQ notifications before teardown Date: Thu, 8 Oct 2026 15:12:02 +0100 Message-ID: <20261008141209.6923-1-prathameshdeshpande7@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit GSI completions queue notify_work to invoke the CQ completion handler. CQ destruction drains hardware events and core polling, but does not cancel this software notifier. Queued or running work can therefore access a freed CQ, or restart polling after ib_free_cq() has drained it. Cancel notify_work in the pre-destroy callback, before core polling is stopped and CQ memory is released. Skip user CQs, which do not initialize this work item. Fixes: 25361e02c448 ("IB/mlx5: Generate completions in software") Signed-off-by: Prathamesh Deshpande --- drivers/infiniband/hw/mlx5/cq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c index 49b4bf148a4a..1653b2747f5f 100644 --- a/drivers/infiniband/hw/mlx5/cq.c +++ b/drivers/infiniband/hw/mlx5/cq.c @@ -1117,6 +1117,9 @@ int mlx5_ib_pre_destroy_cq(struct ib_cq *cq) struct mlx5_ib_dev *dev = to_mdev(cq->device); struct mlx5_ib_cq *mcq = to_mcq(cq); + if (!cq->uobject) + cancel_work_sync(&mcq->notify_work); + return mlx5_core_destroy_cq(dev->mdev, &mcq->mcq); } -- 2.43.0