From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 24137176AA1; Thu, 12 Dec 2024 17:21:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734024109; cv=none; b=Lz7AgnJAQeWPPCvBuPJKl3ASHdxMcNqOcIWZX9PrKht74zdvDZWpFD4OUBgliIOikIWy60NUdtXN0kY82qDXnx/wfKhWVy9DKuc5i8iKP3hqe0Nv1+MsPGSYLeAXhCM80J/IlfS5HOfTDefSAsxAn1v9VBIwmvlkAoDHR7YVFb4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734024109; c=relaxed/simple; bh=LxcfUMhJho2VIDMBhbfMbPDbyGM/U0vTsX0NLOURVpE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iqhr+YQ4Siv/3i7f5jcp0oRzbX6yAkBjkZv4FycqdWADRmWajcNA5Ch4egs4ppQ8dFfWtgScuD0AXequZYeqGA+38ojsiU0E0Dwtci597zyD6uOVtrS3+6GXppulHfnShMcpvBdm8fe9zxgWVo2jfI53Xc5bsHOtzSFUXzsulHU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SqP7Ha8J; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="SqP7Ha8J" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 998AEC4CECE; Thu, 12 Dec 2024 17:21:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734024109; bh=LxcfUMhJho2VIDMBhbfMbPDbyGM/U0vTsX0NLOURVpE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SqP7Ha8JURVJLLHPwKF0oiqGW5uOcmGnxb56jWB26FRSmgOL4zHRe7deiBICnEQVq vTCXlJRnz3FosD/eE6KoLJn7i7JRqjEzVlfkfFL4BtlrcjBruKRrnfrhMT6qx9hEtX adnpABN8twk7/5S6pp5/LrnRXJHIdGYbcZfEsF4I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Rafael J. Wysocki" , Andy Shevchenko , Sasha Levin Subject: [PATCH 5.10 159/459] driver core: Introduce device_find_any_child() helper Date: Thu, 12 Dec 2024 15:58:17 +0100 Message-ID: <20241212144259.797847629@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241212144253.511169641@linuxfoundation.org> References: <20241212144253.511169641@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Shevchenko [ Upstream commit 82b070beae1ef55b0049768c8dc91d87565bb191 ] There are several places in the kernel where this kind of functionality is being used. Provide a generic helper for such cases. Reviewed-by: Rafael J. Wysocki Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220610120219.18988-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman Stable-dep-of: 27aabf27fd01 ("Bluetooth: fix use-after-free in device_for_each_child()") Signed-off-by: Sasha Levin --- drivers/base/core.c | 20 ++++++++++++++++++++ include/linux/device.h | 2 ++ 2 files changed, 22 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index b13a60de5a863..82eb25ad1c72e 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3419,6 +3419,26 @@ struct device *device_find_child_by_name(struct device *parent, } EXPORT_SYMBOL_GPL(device_find_child_by_name); +static int match_any(struct device *dev, void *unused) +{ + return 1; +} + +/** + * device_find_any_child - device iterator for locating a child device, if any. + * @parent: parent struct device + * + * This is similar to the device_find_child() function above, but it + * returns a reference to a child device, if any. + * + * NOTE: you will need to drop the reference with put_device() after use. + */ +struct device *device_find_any_child(struct device *parent) +{ + return device_find_child(parent, NULL, match_any); +} +EXPORT_SYMBOL_GPL(device_find_any_child); + int __init devices_init(void) { devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); diff --git a/include/linux/device.h b/include/linux/device.h index 9c9ce573c737f..d615719b19d4d 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -834,6 +834,8 @@ struct device *device_find_child(struct device *dev, void *data, int (*match)(struct device *dev, void *data)); struct device *device_find_child_by_name(struct device *parent, const char *name); +struct device *device_find_any_child(struct device *parent); + int device_rename(struct device *dev, const char *new_name); int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order); -- 2.43.0