From patchwork Wed Feb 1 10:15:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 649915 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 41387C6379F for ; Wed, 1 Feb 2023 10:16:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232285AbjBAKQp (ORCPT ); Wed, 1 Feb 2023 05:16:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232148AbjBAKQj (ORCPT ); Wed, 1 Feb 2023 05:16:39 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ADFE94A201; Wed, 1 Feb 2023 02:16:37 -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 ams.source.kernel.org (Postfix) with ESMTPS id E4B3EB8215A; Wed, 1 Feb 2023 10:16:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0FC2C4323C; 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=1675246592; bh=l0VN7msG9L+s5ijjJrCbTiHxIlXGehCmox8V3hFK5UU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GSj50QqSIG0/gLjRUheGo/84VIuOPFzdLM3noqHeQSqElOphv+CLzLGUWROMm1uJb gEG+/c0B2csR1hEuJ8UIN4iTjf6gUMPoLZ2KtX6pwXE5CPp08Bw6brh/erB9OsxxO9 bpRAdDY6acHV+rJkczpTvQInlqUafg/qtOKjEnPvQlPcLZJRifacdtdRqHJFgw1LJ3 AhwDUzwi2iWoOEem7wI4J/fYoMxo1eWQwA5pGDsArdTZh4AE3WrlTqdSXbQQPHFWO+ ma+8G0mPAdds0z4OfIHFdtYUqQ0aS/6AY+qhSiaxbF6zotfFKpUKakdFR+kZ4u5Gom GT/+bZb6tI+cg== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pNAAg-00044B-1h; 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 , stable@vger.kernel.org, Vinod Koul Subject: [PATCH 12/23] interconnect: qcom: sm8450: fix registration race Date: Wed, 1 Feb 2023 11:15:48 +0100 Message-Id: <20230201101559.15529-13-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: fafc114a468e ("interconnect: qcom: Add SM8450 interconnect provider driver") Cc: stable@vger.kernel.org # 5.17 Cc: Vinod Koul Signed-off-by: Johan Hovold Reviewed-by: Vinod Koul --- 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; }