From patchwork Wed Feb 1 10:15:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 13124098 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 5C255C74A4B for ; Wed, 1 Feb 2023 10:17:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232388AbjBAKRL (ORCPT ); Wed, 1 Feb 2023 05:17:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232018AbjBAKQf (ORCPT ); Wed, 1 Feb 2023 05:16:35 -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 81E994E533; Wed, 1 Feb 2023 02:16:34 -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 DA34261756; Wed, 1 Feb 2023 10:16:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E55CAC4323E; Wed, 1 Feb 2023 10:16:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675246593; bh=DopQjRozUlqLm8kLLOiYmoJfcthKaCplFrQrtxG3j4o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y3t6mpcRXV0ZYGmIgJ8VKte6Xf6yMsefLMGHNVd5cR9LNCLofo3+VpLIGQ58jUjrQ kuyZhPev32rK9pmni6WgCf0cM4c6ZWGM3xQlaZQ+PD9UWhEYlRexFN4RXtf+t/16rV A9N+IR+FAU9CVOiZ79EX4GmkS/mHvmN1QfJ558IL52g5btRJaPXSAdhKxOAsynt0qH SEW0tLvqwzmqQrgIOJIC00K3fChnSvlvsJMFrmmSBSCjC0dbeAFj4/HuVYoA/Wj7L1 8lUSVJGAj1covok8bXtFis5xVMvInuJEqCbxps55aSQu7j/wlVL4z4X500Opk8zzw5 gBlsNepeoN3ow== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pNAAg-00044D-4G; Wed, 01 Feb 2023 11:16:54 +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?QXJ0dXIgxZp3aWdvxYQ=?= , 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 13/23] interconnect: qcom: sm8550: fix registration race Date: Wed, 1 Feb 2023 11:15:49 +0100 Message-Id: <20230201101559.15529-14-johan+linaro@kernel.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230201101559.15529-1-johan+linaro@kernel.org> References: <20230201101559.15529-1-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") Cc: Abel Vesa Signed-off-by: Johan Hovold Reviewed-by: Abel Vesa Reviewed-by: Konrad Dybcio --- 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; }