From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Fainelli Subject: [PATCH net-next v3 05/10] drivers: base: Add device_find_class() Date: Sat, 14 Jan 2017 13:47:08 -0800 Message-ID: <20170114214713.28109-6-f.fainelli@gmail.com> References: <20170114214713.28109-1-f.fainelli@gmail.com> Cc: Florian Fainelli , Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Russell King , Vivien Didelot , "David S. Miller" , linux-arm-kernel@lists.infradead.org (moderated list:ARM SUB-ARCHITECTURES), linux-kernel@vger.kernel.org (open list), gregkh@linuxfoundation.org To: netdev@vger.kernel.org Return-path: Received: from mail-qt0-f193.google.com ([209.85.216.193]:34291 "EHLO mail-qt0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752222AbdANVre (ORCPT ); Sat, 14 Jan 2017 16:47:34 -0500 In-Reply-To: <20170114214713.28109-1-f.fainelli@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 | 19 +++++++++++++++++++ include/linux/device.h | 1 + 2 files changed, 20 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 020ea7f05520..3dd6047c10d8 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -2065,6 +2065,25 @@ struct device *device_find_child(struct device *parent, void *data, } EXPORT_SYMBOL_GPL(device_find_child); +static int dev_is_class(struct device *dev, void *class) +{ + if (dev->class != NULL && !strcmp(dev->class->name, class)) + return 1; + + return 0; +} + +struct device *device_find_class(struct device *parent, char *class) +{ + if (dev_is_class(parent, class)) { + get_device(parent); + return parent; + } + + return device_find_child(parent, class, dev_is_class); +} +EXPORT_SYMBOL_GPL(device_find_class); + 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..8d37f5ecb972 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1120,6 +1120,7 @@ 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_class(struct device *parent, char *class); 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