From patchwork Sun Mar 12 20:41:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13171856 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 0B24FC74A4B for ; Sun, 12 Mar 2023 20:44:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231584AbjCLUoB (ORCPT ); Sun, 12 Mar 2023 16:44:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231544AbjCLUn0 (ORCPT ); Sun, 12 Mar 2023 16:43:26 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A3023866F; Sun, 12 Mar 2023 13:42:52 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id nn12so10024226pjb.5; Sun, 12 Mar 2023 13:42:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1678653771; 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=ZTj6lDaB879i6vS4ZDrKb4b2c9OODf1NGI0zVIt2OIQ=; b=KC3a1z9EFBAXvyyxFRBFqNe8y53x3UcUyQeZSEkxdXoFUAJoXRMW5x12S3KgDohLCq HgPllXDe0L7d4jpa0swkH8xEUPkFw+qkPtFiETd3slsVUSiYo1BMGyXc78dOVy4xIsa/ iQz7mHAZKXq1dPOkNL0Budytd+6487+pbd6M9552NaGPYaDjcY0OoL/Kg3JCLgUOfw1j VKsL6McmgvXWpcQP5dDkT0F/Lf8ekwYWTnQmW8G5vhEJFBvpzPwqbXsO+AWYZohCOO6R EWELqpscPHrGPQKL7eMTq4bDp1G+IKNbckzIV0LI00pT4l33/MvugcwF0S7AKAFr/dJ+ +U6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678653771; 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=ZTj6lDaB879i6vS4ZDrKb4b2c9OODf1NGI0zVIt2OIQ=; b=zZf/mf/mNjE69j0uXSMEK66hVgPFXs/s+ykB22M6Z/dzjee8zhc2Twzv/axebtC+zI 1cvZZTaN42XcgnAsJmTw0y6elsh1BEiHeOYFER8fNW4TEFjPMeXNeKWkf/CkQ0sw51Pa BN7OWqrelLILq5ZE+zOIRieNW6klHX8JxCmM4oiuYhmUKW0CZLHrtJt+gHUTqMQtIqH3 ms4+REdr3slhKkEfvq6u3sxgPWIdV6JWxM8XQ6veChqgWh07K1VoVcNDevyYHyNQu8/5 XlUesKlBSyMk25ORN7PSbBnh8Sl34LA9BfkVFzkJG2lw98orG6CX6cSF6A5xyZbk7sqP a6+Q== X-Gm-Message-State: AO0yUKV5FG81HYqh4K2eGcN2hh5mecTXxIv5A9RXOXb9jx2os2lFw1YQ RmlaW9Lf91urwfvbZ4L8hJ8= X-Google-Smtp-Source: AK7set8LS5r2Un4ozPG4+s7BFDawLVgaX+1P9ahu9XWoxUwBD1fydMV+4TYjTw5igtEd4Yq+x4LEeg== X-Received: by 2002:a17:90b:368c:b0:23c:8ee2:bc14 with SMTP id mj12-20020a17090b368c00b0023c8ee2bc14mr2702243pjb.24.1678653771444; Sun, 12 Mar 2023 13:42:51 -0700 (PDT) Received: from localhost ([2601:1c0:5080:d9fa:9b45:95de:f47d:f85e]) by smtp.gmail.com with ESMTPSA id it14-20020a17090afb0e00b0023530b1e4a0sm3158971pjb.2.2023.03.12.13.42.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Mar 2023 13:42:50 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: 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 13/13] interconnect: Teach lockdep about icc_bw_lock order Date: Sun, 12 Mar 2023 13:41:41 -0700 Message-Id: <20230312204150.1353517-14-robdclark@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230312204150.1353517-1-robdclark@gmail.com> References: <20230312204150.1353517-1-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 f7251784765f..5619963ee85c 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -1127,13 +1127,21 @@ 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);