From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751834AbdAQX3B (ORCPT ); Tue, 17 Jan 2017 18:29:01 -0500 Received: from mail-pg0-f65.google.com ([74.125.83.65]:33553 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751760AbdAQX25 (ORCPT ); Tue, 17 Jan 2017 18:28:57 -0500 From: Florian Fainelli To: netdev@vger.kernel.org Cc: Florian Fainelli , Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Russell King , Vivien Didelot , "David S. Miller" , Greg Kroah-Hartman , linux-arm-kernel@lists.infradead.org (moderated list:ARM/Marvell Dove/MV78xx0/Orion SOC support), linux-kernel@vger.kernel.org (open list) Subject: [PATCH net-next v4 05/10] drivers: base: Add device_find_in_class_name() Date: Tue, 17 Jan 2017 15:21:47 -0800 Message-Id: <20170117232152.1661-6-f.fainelli@gmail.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170117232152.1661-1-f.fainelli@gmail.com> References: <20170117232152.1661-1-f.fainelli@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a helper function to lookup a device reference given a class name. This is a preliminary patch to remove adhoc code from net/dsa/dsa.c and make it more generic. Signed-off-by: Florian Fainelli --- drivers/base/core.c | 31 +++++++++++++++++++++++++++++++ include/linux/device.h | 2 ++ 2 files changed, 33 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 8c25e68e67d7..fb9fced38634 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -2058,6 +2058,37 @@ struct device *device_find_child(struct device *parent, void *data, } EXPORT_SYMBOL_GPL(device_find_child); +static int device_class_name_match(struct device *dev, void *class) +{ + if (dev->class != NULL && !strcmp(dev->class->name, class)) + return 1; + + return 0; +} + +/** + * device_find_in_class_name - device iterator for locating a particular device + * within the specified class name + * @parent: parent struct device + * @class_name: Class name to match against + * + * This function returns 1 if the device (specified by @parent), or one of its child + * is in the class whose name is specified by @class_name. Returns 0 otherwise. + * + * NOTE: you will need to drop the reference with put_device() after use. + */ +struct device *device_find_in_class_name(struct device *parent, + char *class_name) +{ + if (device_class_name_match(parent, class_name)) { + get_device(parent); + return parent; + } + + return device_find_child(parent, class_name, device_class_name_match); +} +EXPORT_SYMBOL_GPL(device_find_in_class_name); + 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 491b4c0ca633..fbc2a255f92e 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1120,6 +1120,8 @@ extern int device_for_each_child_reverse(struct device *dev, void *data, int (*fn)(struct device *dev, void *data)); extern struct device *device_find_child(struct device *dev, void *data, int (*match)(struct device *dev, void *data)); +extern struct device *device_find_in_class_name(struct device *parent, + char *class_name); extern int device_rename(struct device *dev, const char *new_name); extern int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order); -- 2.9.3