From patchwork Wed Mar 31 10:59:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heikki Krogerus X-Patchwork-Id: 413299 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E5E60C433E6 for ; Wed, 31 Mar 2021 11:00:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B89EE61957 for ; Wed, 31 Mar 2021 11:00:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235223AbhCaK7h (ORCPT ); Wed, 31 Mar 2021 06:59:37 -0400 Received: from mga05.intel.com ([192.55.52.43]:21337 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235181AbhCaK7G (ORCPT ); Wed, 31 Mar 2021 06:59:06 -0400 IronPort-SDR: 3K5bZDcro3qSimAug7mQTuSaWZ8ukX1gsLzcmcv5wbJQCsodLtvtT4O//PRxASLHI4pOSHtV9m OrvYbvsic8oA== X-IronPort-AV: E=McAfee;i="6000,8403,9939"; a="277160560" X-IronPort-AV: E=Sophos;i="5.81,293,1610438400"; d="scan'208";a="277160560" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Mar 2021 03:59:06 -0700 IronPort-SDR: LgsFJoseAodb7w1yKbnwBFpV5iqpXaLLBj4BCNJfTAML77TgYScxtdbqu5IOFQ6Fj1WLpURrZd ISYDKzttaXvQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,293,1610438400"; d="scan'208";a="516844120" Received: from black.fi.intel.com (HELO black.fi.intel.com.) ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 31 Mar 2021 03:59:04 -0700 From: Heikki Krogerus To: Greg Kroah-Hartman Cc: Alan Stern , Guenter Roeck , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 5/6] usb: Iterator for ports Date: Wed, 31 Mar 2021 13:59:07 +0300 Message-Id: <20210331105908.67066-6-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210331105908.67066-1-heikki.krogerus@linux.intel.com> References: <20210331105908.67066-1-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Introducing usb_for_each_port(). It works the same way as usb_for_each_dev(), but instead of going through every USB device in the system, it walks through the USB ports in the system. Signed-off-by: Heikki Krogerus Acked-by: Alan Stern Reported-by: kernel test robot --- drivers/usb/core/usb.c | 46 ++++++++++++++++++++++++++++++++++++++++++ include/linux/usb.h | 9 +++++++++ 2 files changed, 55 insertions(+) diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 2ce3667ec6fae..62368c4ed37af 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -398,6 +398,52 @@ int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)) } EXPORT_SYMBOL_GPL(usb_for_each_dev); +struct each_hub_arg { + void *data; + int (*fn)(struct device *, void *); +}; + +static int __each_hub(struct usb_device *hdev, void *data) +{ + struct each_hub_arg *arg = (struct each_hub_arg *)data; + struct usb_hub *hub; + int ret = 0; + int i; + + hub = usb_hub_to_struct_hub(hdev); + if (!hub) + return 0; + + mutex_lock(&usb_port_peer_mutex); + + for (i = 0; i < hdev->maxchild; i++) { + ret = arg->fn(&hub->ports[i]->dev, arg->data); + if (ret) + break; + } + + mutex_unlock(&usb_port_peer_mutex); + + return ret; +} + +/** + * usb_for_each_port - interate over all USB ports in the system + * @data: data pointer that will be handed to the callback function + * @fn: callback function to be called for each USB port + * + * Iterate over all USB ports and call @fn for each, passing it @data. If it + * returns anything other than 0, we break the iteration prematurely and return + * that value. + */ +int usb_for_each_port(void *data, int (*fn)(struct device *, void *)) +{ + struct each_hub_arg arg = {data, fn}; + + return usb_for_each_dev(&arg, __each_hub); +} +EXPORT_SYMBOL_GPL(usb_for_each_port); + /** * usb_release_dev - free a usb device structure when all users of it are finished. * @dev: device that's been disconnected diff --git a/include/linux/usb.h b/include/linux/usb.h index ddd2f5b2a2827..ebcd03d835d04 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -882,6 +882,15 @@ extern struct usb_host_interface *usb_find_alt_setting( unsigned int iface_num, unsigned int alt_num); +#ifdef CONFIG_USB +int usb_for_each_port(void *data, int (*fn)(struct device *, void *)); +#else +static inline int usb_for_each_port(void *data, int (*fn)(struct device *, void *)) +{ + return 0; +} +#endif + /* port claiming functions */ int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, struct usb_dev_state *owner);