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Received: by smtpng1.m.smailru.net with esmtpa (envelope-from ) id 1oM4O6-0005oG-NL; Thu, 11 Aug 2022 12:21:59 +0300 From: Maxim Kochetkov To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-arm-msm@vger.kernel.org, Maxim Kochetkov , Hemant Kumar , Manivannan Sadhasivam Subject: [PATCH 1/1] net: qrtr: start MHI channel after endpoit creation Date: Thu, 11 Aug 2022 12:21:45 +0300 Message-Id: <20220811092145.1648008-1-fido_max@inbox.ru> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailru-Src: smtp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eAau8CL7WIMRKs4sN3D3tLDjz0dLbV79QFUyzQ2Ujvy7cMT6pYYqY16iZVKkSc3dCLJ7zSJH7+u4VD18S7Vl4ZUrpaVfd2+vE6kuoey4m4VkSEu530nj6fImhcD4MUrOEAnl0W826KZ9Q+tr5ycPtXkTV4k65bRjmOUUP8cvGozZ33TWg5HZplvhhXbhDGzqmQDTd6OAevLeAnq3Ra9uf7zvY2zzsIhlcp/Y7m53TZgf2aB4JOg4gkr2biojfXJM3siCnClSN+JFL8baiQ== X-Mailru-Sender: 689FA8AB762F7393CC2E0F076E87284E1310CF0C612FF4B7439EB8E4D84B453698CC072019C18A892CA7F8C7C9492E1F2F5E575105D0B01ADBE2EF17B331888EEAB4BC95F72C04283CDA0F3B3F5B9367 X-Mras: Ok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eAau8CL7WIMRKs4sN3D3tLDjz0dLbV79QFUyzQ2Ujvy7cMT6pYYqY16iZVKkSc3dCLJ7zSJH7+u4VD18S7Vl4ZUrpaVfd2+vE6kuoey4m4VkSEu530nj6fImhcD4MUrOEAnl0W826KZ9Q+tr5xhPKz0ZEsZ5k6NOOPWz5QAiZSCXKGQRq3/7KxbCLSB2ESzQkaOXqCBFZPLWFrEGlV1shfWe2EVcxl5toh0c/aCGOghz/frdRhzMe95NxDFdEnfY/XW8vr2MqDoWFmfMqw== X-Mailru-MI: C000000000000800 X-Mras: Ok Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org MHI channel may generates event/interrupt right after enabling. It may leads to 2 race conditions issues. 1) Such event may be dropped by qcom_mhi_qrtr_dl_callback() at check: if (!qdev || mhi_res->transaction_status) return; Because dev_set_drvdata(&mhi_dev->dev, qdev) may be not performed at this moment. In this situation qrtr-ns will be unable to enumerate services in device. --------------------------------------------------------------- 2) Such event may come at the moment after dev_set_drvdata() and before qrtr_endpoint_register(). In this case kernel will panic with accessing wrong pointer at qcom_mhi_qrtr_dl_callback(): rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr, mhi_res->bytes_xferd); Because endpoint is not created yet. -------------------------------------------------------------- So move mhi_prepare_for_transfer_autoqueue after endpoint creation to fix it. Fixes: a2e2cc0dbb11 ("net: qrtr: Start MHI channels during init") Signed-off-by: Maxim Kochetkov Reviewed-by: Hemant Kumar Reviewed-by: Manivannan Sadhasivam --- net/qrtr/mhi.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c index 18196e1c8c2f..17520d9e7a51 100644 --- a/net/qrtr/mhi.c +++ b/net/qrtr/mhi.c @@ -78,11 +78,6 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, struct qrtr_mhi_dev *qdev; int rc; - /* start channels */ - rc = mhi_prepare_for_transfer_autoqueue(mhi_dev); - if (rc) - return rc; - qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL); if (!qdev) return -ENOMEM; @@ -96,6 +91,11 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, if (rc) return rc; + /* start channels */ + rc = mhi_prepare_for_transfer_autoqueue(mhi_dev); + if (rc) + return rc; + dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n"); return 0; -- 2.34.1