From patchwork Mon Mar 6 07:56:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 659658 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 14714C6FD1F for ; Mon, 6 Mar 2023 07:57:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229830AbjCFH5m (ORCPT ); Mon, 6 Mar 2023 02:57:42 -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 S229766AbjCFH5k (ORCPT ); Mon, 6 Mar 2023 02:57:40 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA26A193E6; Sun, 5 Mar 2023 23:57:38 -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 CD03C60C41; Mon, 6 Mar 2023 07:57:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B591FC4323F; 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=mqS1yMpvOtlF/aD510co9QvL9Sqs3EAV2IRE+AQZLQE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O7yOFZl+Qtk4XX74Qi70u1qDBllxYcmqeiI8UbdGX/vLfpnc2YGSwLlOQ4QmSeOPC Tb15OUaEV2anm2bH7SAGS06tuDwgbGYhumVP0kK7IOakvOe5K7GVTZ1yfAqLAlHxL2 t3jaF9GbMO2PBH36LDoKf1IayBwCpzCOdtTwOkpkWt+rPgLy52/x759bt7tm1bEAUB s5wcTL85UyLu540cxY/6KjDNAA8H9wAB/LPFOD7hGs0fd6gBgc1s4Sbxip8ai4ubcy IoQpYECiI+6sXQfEckSEIPPAM1lteKE+dx2Kt3aJ/5QryCYk/aBX7yMNbk8fZiR0Hv b3ERCPRfY1rgQ== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pZ5jc-0000iQ-T3; 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 , Abel Vesa Subject: [PATCH v2 13/23] interconnect: qcom: sm8550: fix registration race Date: Mon, 6 Mar 2023 08:56:41 +0100 Message-Id: <20230306075651.2449-14-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-samsung-soc@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: e6f0d6a30f73 ("interconnect: qcom: Add SM8550 interconnect provider driver") Reviewed-by: Abel Vesa Reviewed-by: Konrad Dybcio Signed-off-by: Johan Hovold --- drivers/interconnect/qcom/sm8550.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/interconnect/qcom/sm8550.c b/drivers/interconnect/qcom/sm8550.c index 54fa027ab961..7ab492ca8fe0 100644 --- a/drivers/interconnect/qcom/sm8550.c +++ b/drivers/interconnect/qcom/sm8550.c @@ -2197,9 +2197,10 @@ 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; @@ -2208,12 +2209,6 @@ 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_probe(&pdev->dev, ret, - "error adding interconnect provider\n"); - return ret; - } for (i = 0; i < qp->num_bcms; i++) qcom_icc_bcm_init(qp->bcms[i], &pdev->dev); @@ -2227,7 +2222,7 @@ 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; @@ -2241,12 +2236,17 @@ 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; } @@ -2254,8 +2254,8 @@ 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; }