From patchwork Wed Feb 1 10:15:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 649545 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 27B33C64EC5 for ; Wed, 1 Feb 2023 10:16:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232240AbjBAKQm (ORCPT ); Wed, 1 Feb 2023 05:16:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231157AbjBAKQh (ORCPT ); Wed, 1 Feb 2023 05:16:37 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10CC22ED54; Wed, 1 Feb 2023 02:16:35 -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 BF031B82156; Wed, 1 Feb 2023 10:16:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 589F1C4339B; 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=phHoojYppOTL0BiqO+RWcjhDeLQFCJqdWQpamIw1UYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ultdZ0aUrQ4K3ppR/0jvADGGZ6Yt7OnPldEhMZ7fcTrfod0KotahBnoqUEkXZjoQf 0ldGn30n6CXMrmVLNe2z1vle2vGUHBFscqqK7lMqVGKC0ZzXwlWCrX6njOchd45Oq4 7Fsc+06f3T6XXMUczWAzBOp2827TZjEfU9lddcjtOyGeY6haoQuAn/odnj/H667skH w1YEjDeeqJOYpOGN/YIVHoFtu7O9RCTd52Td2hOpcvw8COiFRlbqw+JKZkBCLv5V7a 3syM1X8JvkYNMbhK43LqYv7LGRywNFoMAz1fL1f4cMWpc9GmtIiY04HPlU2KseqKmM 2p5k5jMzxb17g== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pNAAf-00043q-DP; Wed, 01 Feb 2023 11:16:53 +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 Subject: [PATCH 05/23] interconnect: qcom: osm-l3: fix registration race Date: Wed, 1 Feb 2023 11:15:41 +0100 Message-Id: <20230201101559.15529-6-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-pm@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: of_icc_xlate_onecell: invalid index 0 cpu cpu0: error -EINVAL: error finding src node cpu cpu0: dev_pm_opp_of_find_icc_paths: Unable to get path0: -22 qcom-cpufreq-hw: probe of 18591000.cpufreq failed with error -22 Switch to using the new API where the provider is not registered until after it has been fully initialised. Fixes: 5bc9900addaf ("interconnect: qcom: Add OSM L3 interconnect provider support") Cc: stable@vger.kernel.org # 5.7 Signed-off-by: Johan Hovold Reviewed-by: Konrad Dybcio --- drivers/interconnect/qcom/osm-l3.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/interconnect/qcom/osm-l3.c b/drivers/interconnect/qcom/osm-l3.c index 5fa171087425..3a1cbfe3e481 100644 --- a/drivers/interconnect/qcom/osm-l3.c +++ b/drivers/interconnect/qcom/osm-l3.c @@ -158,8 +158,8 @@ static int qcom_osm_l3_remove(struct platform_device *pdev) { struct qcom_osm_l3_icc_provider *qp = platform_get_drvdata(pdev); + icc_provider_deregister(&qp->provider); icc_nodes_remove(&qp->provider); - icc_provider_del(&qp->provider); return 0; } @@ -245,14 +245,9 @@ static int qcom_osm_l3_probe(struct platform_device *pdev) provider->set = qcom_osm_l3_set; provider->aggregate = icc_std_aggregate; provider->xlate = of_icc_xlate_onecell; - INIT_LIST_HEAD(&provider->nodes); provider->data = data; - ret = icc_provider_add(provider); - if (ret) { - dev_err(&pdev->dev, "error adding interconnect provider\n"); - return ret; - } + icc_provider_init(provider); for (i = 0; i < num_nodes; i++) { size_t j; @@ -275,12 +270,15 @@ static int qcom_osm_l3_probe(struct platform_device *pdev) } data->num_nodes = num_nodes; + ret = icc_provider_register(provider); + if (ret) + goto err; + platform_set_drvdata(pdev, qp); return 0; err: icc_nodes_remove(provider); - icc_provider_del(provider); return ret; }