From patchwork Wed Mar 22 08:36:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 665944 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 5DBD0C6FD1C for ; Wed, 22 Mar 2023 08:37:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229648AbjCVIhN (ORCPT ); Wed, 22 Mar 2023 04:37:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229452AbjCVIhM (ORCPT ); Wed, 22 Mar 2023 04:37:12 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17EB05D89A; Wed, 22 Mar 2023 01:36:53 -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 ams.source.kernel.org (Postfix) with ESMTPS id BFA49B81B8B; Wed, 22 Mar 2023 08:36:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35703C433D2; Wed, 22 Mar 2023 08:36:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1679474210; bh=WUxmnRvTd0FvURbgK1vrDNjlJjS1QMteze29duvTQlM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ug0Xo6ptb8cXZCjg0bvriKbTToHXMFAko5RoPZUFXg74hC8e9pU20mV/GsLnO5IzA wZDjEHdrAdxqcguMYWQHthnTBLXjqPP9Gk4YAZaqIQtVfmoq/y0uRgcffu+RXn9iDh nv31Vvb3ezs3ezV7bQ5P5f9T0qiK3teuq2CZamBs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Len Brown , linux-acpi@vger.kernel.org Subject: [PATCH v2 02/19] ACPI: LPIT: move to use bus_get_dev_root() Date: Wed, 22 Mar 2023 09:36:46 +0100 Message-Id: <20230322083646.2937580-1-gregkh@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: References: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2262; i=gregkh@linuxfoundation.org; h=from:subject; bh=WUxmnRvTd0FvURbgK1vrDNjlJjS1QMteze29duvTQlM=; b=owGbwMvMwCRo6H6F97bub03G02pJDClS++QKCxKDdEo//Uyrurjk0ZIrv5xckoN3/RF+U22Vt yi2fsKVjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZjIlycMC/o7pvxlvOiSN81t VeT9/o17D0/eepRhroy1RWq46BkmaRWh2RJLbf/uEgqdBgA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@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. Cc: "Rafael J. Wysocki" Cc: Len Brown Cc: linux-acpi@vger.kernel.org Signed-off-by: Greg Kroah-Hartman Acked-by: Rafael J. Wysocki --- v2: - change logic to test for dev_root at the beginning of the function and error out then based on review comments from Rafael. - fix error handling for ioremap() call to properly drop the reference on dev_root if it failed. drivers/acpi/acpi_lpit.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c index 3843d2576d3f..c5598b6d5db8 100644 --- a/drivers/acpi/acpi_lpit.c +++ b/drivers/acpi/acpi_lpit.c @@ -98,6 +98,12 @@ EXPORT_SYMBOL_GPL(lpit_read_residency_count_address); static void lpit_update_residency(struct lpit_residency_info *info, struct acpi_lpit_native *lpit_native) { + struct device *dev_root = bus_get_dev_root(&cpu_subsys); + + /* Silently fail, if cpuidle attribute group is not present */ + if (!dev_root) + return; + info->frequency = lpit_native->counter_frequency ? lpit_native->counter_frequency : tsc_khz * 1000; if (!info->frequency) @@ -108,18 +114,18 @@ static void lpit_update_residency(struct lpit_residency_info *info, info->iomem_addr = ioremap(info->gaddr.address, info->gaddr.bit_width / 8); if (!info->iomem_addr) - return; + goto exit; - /* Silently fail, if cpuidle attribute group is not present */ - sysfs_add_file_to_group(&cpu_subsys.dev_root->kobj, + sysfs_add_file_to_group(&dev_root->kobj, &dev_attr_low_power_idle_system_residency_us.attr, "cpuidle"); } else if (info->gaddr.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) { - /* Silently fail, if cpuidle attribute group is not present */ - sysfs_add_file_to_group(&cpu_subsys.dev_root->kobj, + sysfs_add_file_to_group(&dev_root->kobj, &dev_attr_low_power_idle_cpu_residency_us.attr, "cpuidle"); } +exit: + put_device(dev_root); } static void lpit_process(u64 begin, u64 end)