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 9FB5D221D93; Thu, 12 Dec 2024 16:51:38 +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=1734022298; cv=none; b=jyvAYOjb9SALElY72Oo28E9FRQDL+QCJ1GFwmKy2tQg4sb2yOTJv7ei/jN/ZmXsE7zbeJ169uAvJ0qEHjdAtxpEadEFCBNoZKtXmujVY5fneJKjb+2xA0KLmxORzmeWPktX1Hu01z5fWai9Go1s5KbRlIbEAOVUqClasB+vt630= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734022298; c=relaxed/simple; bh=q2ddmTfjcwRJvh4KTEyNEDBFEZvk7pGZAG6nVjwt4Co=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RMNU4jX9C+T2gzCgedckoe3U/XhSxRLFXAJDmwTaBs7XtW8pas9EegTK1dbqCWeFxJzm5Vd1+tuJs1zJHwBY2fXbhKz6MLnszSiL4oqOt6HxqmVSq80jtMctgJ1HKJleTJZqu3ex+EIMfDAuQRcSC6Ky9t1mreiNjqK8KI7fQNE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=k+1gfgvR; 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="k+1gfgvR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20705C4CECE; Thu, 12 Dec 2024 16:51:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734022298; bh=q2ddmTfjcwRJvh4KTEyNEDBFEZvk7pGZAG6nVjwt4Co=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k+1gfgvRgXZizPyaBz9wcC2jefZTs1nr/5ngT1iEuJJ2LDU1pTh6MsaP4cKleX5c0 TwMiucIeeWATrZppYN9ZCUwNuTvc9PNO85e5NEB+mb8KDdYxCStqtyr6aVUMwXo/me vi3TxHgAy1Jv1ndJVb7ACuI5ZPi5QiAgBME3Bldg= 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 5.15 204/565] driver core: Introduce device_find_any_child() helper Date: Thu, 12 Dec 2024 15:56:39 +0100 Message-ID: <20241212144319.554565743@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241212144311.432886635@linuxfoundation.org> References: <20241212144311.432886635@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 5.15-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 d995d768c362a..4fc62624a95e2 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3829,6 +3829,26 @@ 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 3e04bd84f1264..440c9f1a3f350 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -830,6 +830,8 @@ 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