From patchwork Mon Aug 7 17:11:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13344650 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 A3E98C04A6A for ; Mon, 7 Aug 2023 17:13:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232097AbjHGRNF (ORCPT ); Mon, 7 Aug 2023 13:13:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232105AbjHGRMd (ORCPT ); Mon, 7 Aug 2023 13:12:33 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77DAA2112; Mon, 7 Aug 2023 10:12:13 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id d9443c01a7336-1bc1c1c68e2so29731165ad.3; Mon, 07 Aug 2023 10:12:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691428332; x=1692033132; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=GuYmHdMlJJm2W9mV95yYZgg2mXFJPDcfJ3tRYlFlHrM=; b=sS/VIkX47fuVcUKRL0cK2M6E4NLixhZ4dvdNS5yQN4wZFBy/NvIcAIDOMZlKsXmnaT qkDx6Msrx6ax7/jxstRRx0hXiYyaxZ0P18SReVIfZihM+jpDoIgxeTRi1VJiTGt14zrd P9J9ggKq9lMjx/HHtAbuuOWs1lt9BYwyoYqsgPht33IVBW2Eirc3VmswvwSewQFCxKwM O3MuO+NqJ8Dfwcsuv7rkzrrYP2GrO4uGOocy+Hlge+VqB4OktDEw1EqafkJF+luWzT19 nXviOpAdXA/FraF/OBm3t0i5VZn9CAzp6HAetxm4cFUjErFyCxZhyaaeqx+CtLXh+olQ vwUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691428332; x=1692033132; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=GuYmHdMlJJm2W9mV95yYZgg2mXFJPDcfJ3tRYlFlHrM=; b=bJZIEwNe/4n639OeS/blvL/+8OoOn6VL1XFjFku5AoU1bRwzaOIT+HnbBeZVm4Fw9P ueIYHpduEYJVF0FjqrJWV0HYcI/xZ8OJEavlFgpBv5BzMzc19RccPmhiRGvyPbdt5oqD M2phyLMcMYCCLmlUbhmsFoA/d/6EvpF2+lYpO7Rbard+NBMw2Df3ZS6yTIckIog+g7qV 0RbbT/Onu7stwGYPJB++n12MjovTuaH0hf0XSYbXyBKVa/tUuIZPYDeyPgAPXbh77Dx1 SF5UOmyo9m85kLCCHTua9dkuNFExWsC3dKeEELBNhnGr+wKPqslR6Nelr8UZMr8ffAxP KZXA== X-Gm-Message-State: AOJu0YxWOhoYoxMeAGouSEAykhOChpGt4pLBuVWiS3VscXP8aUk9SslK lddOaKjSOTZCaU8vTmfewlA= X-Google-Smtp-Source: AGHT+IHNX8/tpl8CGO0R5k+B2yYyWetCEGj10aF8tXzMfdM+leuP+DXeencaiMPqZLDVUD4/bv0C8g== X-Received: by 2002:a17:903:32d0:b0:1bb:14e7:4fd0 with SMTP id i16-20020a17090332d000b001bb14e74fd0mr9285594plr.7.1691428331973; Mon, 07 Aug 2023 10:12:11 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:6c80:7c10:75a0:44f4]) by smtp.gmail.com with ESMTPSA id b4-20020a170902b60400b001a95f632340sm7159020pls.46.2023.08.07.10.12.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 10:12:11 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Rob Clark , Georgi Djakov , linux-pm@vger.kernel.org (open list:INTERCONNECT API), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 7/9] interconnect: Teach lockdep about icc_bw_lock order Date: Mon, 7 Aug 2023 10:11:41 -0700 Message-ID: <20230807171148.210181-8-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230807171148.210181-1-robdclark@gmail.com> References: <20230807171148.210181-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark Teach lockdep that icc_bw_lock is needed in code paths that could deadlock if they trigger reclaim. Signed-off-by: Rob Clark --- drivers/interconnect/core.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index e15a92a79df1..1afbc4f7c6e7 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -1041,13 +1041,21 @@ void icc_sync_state(struct device *dev) } } } + mutex_unlock(&icc_bw_lock); mutex_unlock(&icc_lock); } EXPORT_SYMBOL_GPL(icc_sync_state); static int __init icc_init(void) { - struct device_node *root = of_find_node_by_path("/"); + struct device_node *root; + + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&icc_bw_lock); + fs_reclaim_release(GFP_KERNEL); + + root = of_find_node_by_path("/"); providers_count = of_count_icc_providers(root); of_node_put(root);