From patchwork Fri Jul 12 17:00:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11042537 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B0CC6138D for ; Fri, 12 Jul 2019 17:00:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9C85E28A27 for ; Fri, 12 Jul 2019 17:00:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9056F28A1B; Fri, 12 Jul 2019 17:00:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 13D1728A27 for ; Fri, 12 Jul 2019 17:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727488AbfGLRA5 (ORCPT ); Fri, 12 Jul 2019 13:00:57 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:35183 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727523AbfGLRA4 (ORCPT ); Fri, 12 Jul 2019 13:00:56 -0400 Received: by mail-pf1-f195.google.com with SMTP id u14so4569513pfn.2 for ; Fri, 12 Jul 2019 10:00:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=uLNu1bNfXx9GZiloNUkoMF2osR0IeSD3rZ+ilvr5XTc=; b=PDwA/gZsXG+XYktKswWs/2Gn12cvdpksMcVfhV4f5cQ2amErP4DoEKs+QOyWFDZNEy EhdkxYvI7be/FhngwlDuaBTUmRgc+ML7Qz9l7DKf6SbH3bUAXzcNbcO+1xqzK+xzKSRF CqUS8bkdiHnwIWTF/f5Ak11AwwqHuzEO2jIsI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uLNu1bNfXx9GZiloNUkoMF2osR0IeSD3rZ+ilvr5XTc=; b=WWUyz59App8iNvFv1ruaxQiRZKgAL0I6IlBtyazTV+FYn8S6KN79DumlucpyUQ83DP 0YVMk8NsbzxXe0G3tQUWdphbLbVECPTkM53eaotnyTKHKQTxL9ZIuYFMMJEeJjrbAxd/ j9e8Ev/ZIZ3/J1vItxNL4+X8YayI2q7jlAo5YTLk/VR5I7/9hhUesK9ApUI4R9SSgnYS B0EInoEbnzuzrCrv4iWvPOleVlFPtSwaQj7tJHuRz3dijeWiFBnJgKTEPFau3XAuXLpH qVGf2PPTpL1s5OdIXC03YG6yjk5JbyiCLg8+bEqkIFQCAMPStp48Ipu2+z3HT5vOU1eV daXQ== X-Gm-Message-State: APjAAAUk42d78iVGjKOBR6A/zo7MOK1hj7wamgy0OwyYD37f+XX3Opi4 73obA4fRRFQIWDbWfDQePtw= X-Google-Smtp-Source: APXvYqxo29aUnJsblfaix5vIIyfwEhSW/G6KMDPHxkwFkI02a+GjQdJRmAHZ+ogBqlkPr4JyQ4+nQw== X-Received: by 2002:a65:5687:: with SMTP id v7mr12126488pgs.263.1562950854709; Fri, 12 Jul 2019 10:00:54 -0700 (PDT) Received: from joelaf.cam.corp.google.com ([2620:15c:6:12:9c46:e0da:efbf:69cc]) by smtp.gmail.com with ESMTPSA id a15sm7127385pgw.3.2019.07.12.10.00.50 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 12 Jul 2019 10:00:53 -0700 (PDT) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Greg Kroah-Hartman , Alexey Kuznetsov , Bjorn Helgaas , Borislav Petkov , c0d1n61at3@gmail.com, "David S. Miller" , edumazet@google.com, Hideaki YOSHIFUJI , "H. Peter Anvin" , Ingo Molnar , Jonathan Corbet , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, kernel-team@android.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, Oleg Nesterov , "Paul E. McKenney" , Pavel Machek , peterz@infradead.org, "Rafael J. Wysocki" , Rasmus Villemoes , rcu@vger.kernel.org, Steven Rostedt , Tejun Heo , Thomas Gleixner , will@kernel.org, x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)) Subject: [PATCH v2 5/9] driver/core: Convert to use built-in RCU list checking Date: Fri, 12 Jul 2019 13:00:20 -0400 Message-Id: <20190712170024.111093-6-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.510.g264f2c817a-goog In-Reply-To: <20190712170024.111093-1-joel@joelfernandes.org> References: <20190712170024.111093-1-joel@joelfernandes.org> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP list_for_each_entry_rcu has built-in RCU and lock checking. Make use of it in driver core. Acked-by: Greg Kroah-Hartman Signed-off-by: Joel Fernandes (Google) --- drivers/base/base.h | 1 + drivers/base/core.c | 10 ++++++++++ drivers/base/power/runtime.c | 15 ++++++++++----- 3 files changed, 21 insertions(+), 5 deletions(-) diff --git a/drivers/base/base.h b/drivers/base/base.h index b405436ee28e..0d32544b6f91 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -165,6 +165,7 @@ static inline int devtmpfs_init(void) { return 0; } /* Device links support */ extern int device_links_read_lock(void); extern void device_links_read_unlock(int idx); +extern int device_links_read_lock_held(void); extern int device_links_check_suppliers(struct device *dev); extern void device_links_driver_bound(struct device *dev); extern void device_links_driver_cleanup(struct device *dev); diff --git a/drivers/base/core.c b/drivers/base/core.c index fd7511e04e62..6c5ca9685647 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -68,6 +68,11 @@ void device_links_read_unlock(int idx) { srcu_read_unlock(&device_links_srcu, idx); } + +int device_links_read_lock_held(void) +{ + return srcu_read_lock_held(&device_links_srcu); +} #else /* !CONFIG_SRCU */ static DECLARE_RWSEM(device_links_lock); @@ -91,6 +96,11 @@ void device_links_read_unlock(int not_used) { up_read(&device_links_lock); } + +int device_links_read_lock_held(void) +{ + return lock_is_held(&device_links_lock); +} #endif /* !CONFIG_SRCU */ /** diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 952a1e7057c7..7a10e8379a70 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -287,7 +287,8 @@ static int rpm_get_suppliers(struct device *dev) { struct device_link *link; - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) { int retval; if (!(link->flags & DL_FLAG_PM_RUNTIME) || @@ -309,7 +310,8 @@ static void rpm_put_suppliers(struct device *dev) { struct device_link *link; - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) { if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND) continue; @@ -1640,7 +1642,8 @@ void pm_runtime_clean_up_links(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.consumers, s_node) { + list_for_each_entry_rcu(link, &dev->links.consumers, s_node, + device_links_read_lock_held()) { if (link->flags & DL_FLAG_STATELESS) continue; @@ -1662,7 +1665,8 @@ void pm_runtime_get_suppliers(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) if (link->flags & DL_FLAG_PM_RUNTIME) { link->supplier_preactivated = true; refcount_inc(&link->rpm_active); @@ -1683,7 +1687,8 @@ void pm_runtime_put_suppliers(struct device *dev) idx = device_links_read_lock(); - list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) + list_for_each_entry_rcu(link, &dev->links.suppliers, c_node, + device_links_read_lock_held()) if (link->supplier_preactivated) { link->supplier_preactivated = false; if (refcount_dec_not_one(&link->rpm_active))