From patchwork Thu Jan 19 01:35:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Zhang, Tianfei" X-Patchwork-Id: 13107254 X-Patchwork-Delegate: bhelgaas@google.com 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 B90D6C678DC for ; Thu, 19 Jan 2023 01:31:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230188AbjASBbk (ORCPT ); Wed, 18 Jan 2023 20:31:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229928AbjASBai (ORCPT ); Wed, 18 Jan 2023 20:30:38 -0500 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 520214903B; Wed, 18 Jan 2023 17:28:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674091718; x=1705627718; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VUExVLrrHvppHIaV2qBfwGoE2alj2nO9APdfx3eq+jA=; b=S4moSG0ym34U+hnnxDK+RV3LjoqM7hQ0o5KF8uwQ3ku5P53cVP1RnlsE OzrlYlRTQ0Ee5sMi6D283YD2F35nGKYfH2got7oX2TEve8SNhl56pe74V GMSjxdgkrm8BwIgMmqyjsv+gWRgWP16YXJiUYmx5AraFcdKy6Jjt6KHGI 2I9TGXkuD8JS8iUZj+BWJwaXGOG31LM2zfBX8s3QZefIj63YSuASuqzyE hFHt7edDIEX8ewKwtozsPvteRnnshBxF4Ft+O6rsdh4AJogtb45/maRiA hUCHDyWZl74Eqkl7HLaFw0gp7r9JC0tyn0eZwqu/iNGO7E2gJx6ZBntJS A==; X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="322847521" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="322847521" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jan 2023 17:28:38 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="767995651" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="767995651" Received: from unknown (HELO fedora.sh.intel.com) ([10.238.175.104]) by fmsmga002.fm.intel.com with ESMTP; 18 Jan 2023 17:28:32 -0800 From: Tianfei Zhang To: bhelgaas@google.com, linux-pci@vger.kernel.org, linux-fpga@vger.kernel.org, lukas@wunner.de, kabel@kernel.org, mani@kernel.org, pali@kernel.org, mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, jgg@ziepe.ca, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, dan.j.williams@intel.com, keescook@chromium.org, rafael@kernel.org, russell.h.weight@intel.com, corbet@lwn.net, linux-doc@vger.kernel.org, ilpo.jarvinen@linux.intel.com, lee@kernel.org, gregkh@linuxfoundation.org, matthew.gerlach@linux.intel.com Cc: Tianfei Zhang Subject: [PATCH v1 06/12] driver core: expose device_is_ancestor() API Date: Wed, 18 Jan 2023 20:35:56 -0500 Message-Id: <20230119013602.607466-7-tianfei.zhang@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230119013602.607466-1-tianfei.zhang@intel.com> References: <20230119013602.607466-1-tianfei.zhang@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Exposes device_is_ancestor() API which can be used for check the device is the target device's ancestor or not. Signed-off-by: Tianfei Zhang Reviewed-by: Ilpo Järvinen Reviewed-by: Andy Shevchenko --- drivers/base/core.c | 3 ++- include/linux/device.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index a3e14143ec0c..597192b38198 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -262,7 +262,7 @@ static void device_link_remove_from_lists(struct device_link *link) } #endif /* !CONFIG_SRCU */ -static bool device_is_ancestor(struct device *dev, struct device *target) +bool device_is_ancestor(struct device *dev, struct device *target) { while (target->parent) { target = target->parent; @@ -271,6 +271,7 @@ static bool device_is_ancestor(struct device *dev, struct device *target) } return false; } +EXPORT_SYMBOL_GPL(device_is_ancestor); /** * device_is_dependent - Check if one device depends on another one diff --git a/include/linux/device.h b/include/linux/device.h index 44e3acae7b36..35e35982d9a5 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -909,6 +909,7 @@ int device_move(struct device *dev, struct device *new_parent, int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid); const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid, const char **tmp); +bool device_is_ancestor(struct device *dev, struct device *target); int device_is_dependent(struct device *dev, void *target); static inline bool device_supports_offline(struct device *dev)