From patchwork Wed Jul 28 23:54:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 488811 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68807C4338F for ; Wed, 28 Jul 2021 23:54:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B07D6103C for ; Wed, 28 Jul 2021 23:54:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232727AbhG1Xya (ORCPT ); Wed, 28 Jul 2021 19:54:30 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:18563 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232641AbhG1Xya (ORCPT ); Wed, 28 Jul 2021 19:54:30 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1627516468; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=rG5MyP/cD6Lu3423Hm61sSZ+MdCpGFjzTE2RP88KNMY=; b=kwgFkqaI3Uy+tCnfV8CM/yJ1gi863pYwliCY6oKdIcTI5jusfRI6ejPM/RomT2ME2WzZife6 mhynF8GhIQOJJjTF7K9e7etH6IHZjh9Y/qgxXmqpZVdGWwxQNSLzCys/xHCzLj1qD5vTohQC wtF4H5WDlVBa5B1aBNIeNDPW2ro= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n07.prod.us-west-2.postgun.com with SMTP id 6101ee2c9771b05b2441e0e1 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 28 Jul 2021 23:54:20 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 8944BC4323A; Wed, 28 Jul 2021 23:54:20 +0000 (UTC) Received: from malabar-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id EAB38C4338A; Wed, 28 Jul 2021 23:54:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org EAB38C4338A Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org, davem@davemloft.net, kuba@kernel.org Cc: bqiang@codeaurora.org, linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org, clew@codeaurora.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Bhaumik Bhatt Subject: [RESEND PATCH] net: qrtr: mhi: synchronize qrtr and mhi preparation Date: Wed, 28 Jul 2021 16:54:11 -0700 Message-Id: <1627516451-35294-1-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org A dl callback can be received anytime after mhi_prepare_for_transfer has been called. There is a window where the callback may happen before the probe initializes the qrtr_mhi_dev state. Move the mhi_prepare_for_transfer call after the registering the endpoint. Once moved, the reverse can happen where qrtr will try to send a packet before the channels are prepared. Add a wait in the sending path to ensure the channels are prepared before trying to do a ul transfer. Fixes: a2e2cc0dbb11 ("net: qrtr: Start MHI channels during init") Signed-off-by: Bhaumik Bhatt Reviewed-by: Hemant Kumar --- Tested-on: X86_64 architecture net/qrtr/mhi.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c index 29b4fa3..88f046b 100644 --- a/net/qrtr/mhi.c +++ b/net/qrtr/mhi.c @@ -15,6 +15,7 @@ struct qrtr_mhi_dev { struct qrtr_endpoint ep; struct mhi_device *mhi_dev; struct device *dev; + struct completion ready; }; /* From MHI to QRTR */ @@ -50,6 +51,10 @@ static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb) struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep); int rc; + rc = wait_for_completion_interruptible(&qdev->ready); + if (rc) + goto free_skb; + if (skb->sk) sock_hold(skb->sk); @@ -78,17 +83,13 @@ 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(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS); - if (rc) - return rc; - qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL); if (!qdev) return -ENOMEM; qdev->mhi_dev = mhi_dev; qdev->dev = &mhi_dev->dev; + init_completion(&qdev->ready); qdev->ep.xmit = qcom_mhi_qrtr_send; dev_set_drvdata(&mhi_dev->dev, qdev); @@ -96,6 +97,15 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, if (rc) return rc; + /* start channels */ + rc = mhi_prepare_for_transfer(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS); + if (rc) { + qrtr_endpoint_unregister(&qdev->ep); + dev_set_drvdata(&mhi_dev->dev, NULL); + return rc; + } + + complete_all(&qdev->ready); dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n"); return 0;