From patchwork Mon Mar 13 18:28:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 13173090 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 C4337C61DA4 for ; Mon, 13 Mar 2023 18:31:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230503AbjCMSbR (ORCPT ); Mon, 13 Mar 2023 14:31:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230512AbjCMSar (ORCPT ); Mon, 13 Mar 2023 14:30:47 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76DEE15179; Mon, 13 Mar 2023 11:30:20 -0700 (PDT) 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 dfw.source.kernel.org (Postfix) with ESMTPS id F21CF6147D; Mon, 13 Mar 2023 18:30:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14EE6C4339C; Mon, 13 Mar 2023 18:30:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678732207; bh=hXLKonMm2sNxAWG39959mWWF++bz6QKPSxDIBNJCa+k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ab6OR33cN0NvU+6g9zXWYvinHqjfhlr0RvqZqfI7FeYbPnSOY27hkdBPgdUe7B7pe hd3L1GyUMfQf2/hLNWmByUFkExGLumyWwXoqB7zn5mDFlXVYvHv/lI2ebq2gej16Sc FyBvyj89uQPe6Xjp317pH+/OcPBdcZCQFKy4TKTU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: rafael@kernel.org, Greg Kroah-Hartman , Daniel Lezcano , linux-pm@vger.kernel.org Subject: [PATCH 06/36] cpuidle: move to use bus_get_dev_root() Date: Mon, 13 Mar 2023 19:28:48 +0100 Message-Id: <20230313182918.1312597-6-gregkh@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230313182918.1312597-1-gregkh@linuxfoundation.org> References: <20230313182918.1312597-1-gregkh@linuxfoundation.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2943; i=gregkh@linuxfoundation.org; h=from:subject; bh=hXLKonMm2sNxAWG39959mWWF++bz6QKPSxDIBNJCa+k=; b=owGbwMvMwCRo6H6F97bub03G02pJDCn82WVLjjRum3e46v65hebO/hNqY6eZsRx/8JQt6IFe5 pKdzu+LO2JZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAi7p0MC5beqH1Sx1G8to+5 UepNkvmyoEc3vzEs6Epd4rBanU9C4mzqmtvV/lPeGarnAgA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Direct access to the struct bus_type dev_root pointer is going away soon so replace that with a call to bus_get_dev_root() instead, which is what it is there for. This allows us to clean up the cpuidle_add_interface() call a bit as it was only called in one place, with the same argument so just put that into the function itself. Note that cpuidle_remove_interface() should also probably be removed in the future as there are no callers of it for some reason. Cc: "Rafael J. Wysocki" Cc: Daniel Lezcano Cc: linux-pm@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- Note, this is a patch that is a prepatory cleanup as part of a larger series of patches that is working on resolving some old driver core design mistakes. It will build and apply cleanly on top of 6.3-rc2 on its own, but I'd prefer if I could take it through my driver-core tree so that the driver core changes can be taken through there for 6.4-rc1. drivers/cpuidle/cpuidle.c | 2 +- drivers/cpuidle/cpuidle.h | 2 +- drivers/cpuidle/sysfs.c | 12 +++++++++--- 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 0b00f21cefe3..8e929f6602ce 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -808,7 +808,7 @@ static int __init cpuidle_init(void) if (cpuidle_disabled()) return -ENODEV; - return cpuidle_add_interface(cpu_subsys.dev_root); + return cpuidle_add_interface(); } module_param(off, int, 0444); diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h index 9f336af17fa6..52701d9588f1 100644 --- a/drivers/cpuidle/cpuidle.h +++ b/drivers/cpuidle/cpuidle.h @@ -30,7 +30,7 @@ extern int cpuidle_switch_governor(struct cpuidle_governor *gov); struct device; -extern int cpuidle_add_interface(struct device *dev); +extern int cpuidle_add_interface(void); extern void cpuidle_remove_interface(struct device *dev); extern int cpuidle_add_device_sysfs(struct cpuidle_device *device); extern void cpuidle_remove_device_sysfs(struct cpuidle_device *device); diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c index 48948b171749..84e4946f1072 100644 --- a/drivers/cpuidle/sysfs.c +++ b/drivers/cpuidle/sysfs.c @@ -119,11 +119,17 @@ static struct attribute_group cpuidle_attr_group = { /** * cpuidle_add_interface - add CPU global sysfs attributes - * @dev: the target device */ -int cpuidle_add_interface(struct device *dev) +int cpuidle_add_interface(void) { - return sysfs_create_group(&dev->kobj, &cpuidle_attr_group); + struct device *dev_root = bus_get_dev_root(&cpu_subsys); + int retval = -EINVAL; + + if (dev_root) { + retval = sysfs_create_group(&dev_root->kobj, &cpuidle_attr_group); + put_device(dev_root); + } + return retval; } /**