From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C267C28D13 for ; Mon, 22 Aug 2022 12:54:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231577AbiHVMyd (ORCPT ); Mon, 22 Aug 2022 08:54:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229704AbiHVMyc (ORCPT ); Mon, 22 Aug 2022 08:54:32 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 363A5DF04 for ; Mon, 22 Aug 2022 05:54:32 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C73C661151 for ; Mon, 22 Aug 2022 12:54:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1B69C433D6; Mon, 22 Aug 2022 12:54:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661172871; bh=vTWxdNd1Qmn6NSC7NWdKQRI//dBCEbzLINQ7wYDyIkw=; h=Subject:To:Cc:From:Date:From; b=U/Arf/wZuyMuhcZ2Elydl+paJXuL+MkAJbl/wdtkUcqIfNylSzWe0rilMXej5BHjv XorwXgkwIacB5ArOfqsSC6mrthKEI3qUZx8bdrLZwgDEoThQCVT1ZOyL2uRE3BysdF lT/EsAR7f9+39xQgpXYokWrSohnI0Ounm5S8Y3iw= Subject: FAILED: patch "[PATCH] net: qrtr: start MHI channel after endpoit creation" failed to apply to 5.10-stable tree To: fido_max@inbox.ru, davem@davemloft.net, loic.poulain@linaro.org, mani@kernel.org, quic_hemantk@quicinc.com Cc: From: Date: Mon, 22 Aug 2022 14:54:20 +0200 Message-ID: <166117286022916@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 68a838b84effb7b57ba7d50b1863fc6ae35a54ce Mon Sep 17 00:00:00 2001 From: Maxim Kochetkov Date: Thu, 11 Aug 2022 12:48:40 +0300 Subject: [PATCH] net: qrtr: start MHI channel after endpoit creation 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 Reviewed-by: Loic Poulain Signed-off-by: David S. Miller diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c index 18196e1c8c2f..9ced13c0627a 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 +91,13 @@ 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) { + qrtr_endpoint_unregister(&qdev->ep); + return rc; + } + dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n"); return 0;