From patchwork Mon Mar 6 07:56:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 660683 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 3410EC76196 for ; Mon, 6 Mar 2023 07:58:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229985AbjCFH6G (ORCPT ); Mon, 6 Mar 2023 02:58:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229811AbjCFH5l (ORCPT ); Mon, 6 Mar 2023 02:57:41 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BDC3E1B54F; Sun, 5 Mar 2023 23:57:39 -0800 (PST) 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 31D8760C5E; Mon, 6 Mar 2023 07:57:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E98EC432C6; Mon, 6 Mar 2023 07:57:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1678089456; bh=WNlDzMAqt5q/CNBKwmZZhn/yDyiT8ouCBiWMDKsMkEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TQbeL/TnSrTU74g4MfD1rt07VPxAMBk+NUs+S1f9fzZIoQVrrZcAY+BZx91Pptjpr mXxN7Uy7WIllYAftmRVrEkcgXHfulRRmwVCtUWfUp8krBPzeJSvqi8o+Rt7LKD0rql pVs1we5Pk9g37BUuALHSmMxSkDVRoBGyM8yc0Bag6eMjnz+vLaqjZMkJRKjOigCezk KoK6WyYxgVbRZf8QRJLt2QEY3NKiwghRCkbDmVcS5zIMSnrs5O+9Dbd2XZzEKGylwv Dgt34o2ulc6NX5Df7eQVkqzOhazGvjLfJfpJ+nZ4pBKSHhO2rUb8qmYNwH0+37bcs7 sal6o6VVfl8iw== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pZ5jc-0000iN-Pm; Mon, 06 Mar 2023 08:58:16 +0100 From: Johan Hovold To: Georgi Djakov Cc: "Shawn Guo" , "Sascha Hauer" , "Pengutronix Kernel Team" , "Fabio Estevam" , "NXP Linux Team" , "Andy Gross" , "Bjorn Andersson" , "Konrad Dybcio" , "Sylwester Nawrocki" , =?utf-8?b?QXJ0dXIgxZp3aWdv?= =?utf-8?b?xYQ=?= , "Krzysztof Kozlowski" , "Alim Akhtar" , "Thierry Reding" , "Jonathan Hunter" , linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org, Vinod Koul Subject: [PATCH v2 12/23] interconnect: qcom: sm8450: fix registration race Date: Mon, 6 Mar 2023 08:56:40 +0100 Message-Id: <20230306075651.2449-13-johan+linaro@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230306075651.2449-1-johan+linaro@kernel.org> References: <20230306075651.2449-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The current interconnect provider registration interface is inherently racy as nodes are not added until the after adding the provider. This can specifically cause racing DT lookups to fail. Switch to using the new API where the provider is not registered until after it has been fully initialised. Fixes: fafc114a468e ("interconnect: qcom: Add SM8450 interconnect provider driver") Cc: stable@vger.kernel.org # 5.17 Reviewed-by: Konrad Dybcio Reviewed-by: Vinod Koul Signed-off-by: Johan Hovold --- drivers/interconnect/qcom/sm8450.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/interconnect/qcom/sm8450.c b/drivers/interconnect/qcom/sm8450.c index e3a12e3d6e06..c7a8bbf102a3 100644 --- a/drivers/interconnect/qcom/sm8450.c +++ b/drivers/interconnect/qcom/sm8450.c @@ -1876,9 +1876,10 @@ static int qnoc_probe(struct platform_device *pdev) provider->pre_aggregate = qcom_icc_pre_aggregate; provider->aggregate = qcom_icc_aggregate; provider->xlate_extended = qcom_icc_xlate_extended; - INIT_LIST_HEAD(&provider->nodes); provider->data = data; + icc_provider_init(provider); + qp->dev = &pdev->dev; qp->bcms = desc->bcms; qp->num_bcms = desc->num_bcms; @@ -1887,12 +1888,6 @@ static int qnoc_probe(struct platform_device *pdev) if (IS_ERR(qp->voter)) return PTR_ERR(qp->voter); - ret = icc_provider_add(provider); - if (ret) { - dev_err(&pdev->dev, "error adding interconnect provider\n"); - return ret; - } - for (i = 0; i < qp->num_bcms; i++) qcom_icc_bcm_init(qp->bcms[i], &pdev->dev); @@ -1905,7 +1900,7 @@ static int qnoc_probe(struct platform_device *pdev) node = icc_node_create(qnodes[i]->id); if (IS_ERR(node)) { ret = PTR_ERR(node); - goto err; + goto err_remove_nodes; } node->name = qnodes[i]->name; @@ -1919,12 +1914,17 @@ static int qnoc_probe(struct platform_device *pdev) } data->num_nodes = num_nodes; + ret = icc_provider_register(provider); + if (ret) + goto err_remove_nodes; + platform_set_drvdata(pdev, qp); return 0; -err: + +err_remove_nodes: icc_nodes_remove(provider); - icc_provider_del(provider); + return ret; } @@ -1932,8 +1932,8 @@ static int qnoc_remove(struct platform_device *pdev) { struct qcom_icc_provider *qp = platform_get_drvdata(pdev); + icc_provider_deregister(&qp->provider); icc_nodes_remove(&qp->provider); - icc_provider_del(&qp->provider); return 0; }