From mboxrd@z Thu Jan 1 00:00:00 1970 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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 52B70C54FCB for ; Thu, 23 Apr 2020 23:09:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A95A20780 for ; Thu, 23 Apr 2020 23:09:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728653AbgDWXJH (ORCPT ); Thu, 23 Apr 2020 19:09:07 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:50916 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728661AbgDWXG6 (ORCPT ); Thu, 23 Apr 2020 19:06:58 -0400 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jRkvl-0004zB-MM; Fri, 24 Apr 2020 00:06:53 +0100 Received: from ben by deadeye with local (Exim 4.93) (envelope-from ) id 1jRkvi-00E72y-Ft; Fri, 24 Apr 2020 00:06:50 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "David S. Miller" , "Dmitry Torokhov" Date: Fri, 24 Apr 2020 00:07:39 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 232/245] ptp: create "pins" together with the rest of attributes In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.83-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Torokhov commit 85a66e55019583da1e0f18706b7a8281c9f6de5b upstream. Let's switch to using device_create_with_groups(), which will allow us to create "pins" attribute group together with the rest of ptp device attributes, and before userspace gets notified about ptp device creation. Signed-off-by: Dmitry Torokhov Signed-off-by: David S. Miller [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- drivers/ptp/ptp_clock.c | 20 +++++++++++--------- drivers/ptp/ptp_private.h | 7 ++++--- drivers/ptp/ptp_sysfs.c | 39 +++++++++------------------------------ 3 files changed, 24 insertions(+), 42 deletions(-) --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -210,16 +210,17 @@ struct ptp_clock *ptp_clock_register(str mutex_init(&ptp->pincfg_mux); init_waitqueue_head(&ptp->tsev_wq); + err = ptp_populate_pin_groups(ptp); + if (err) + goto no_pin_groups; + /* Create a new device in our class. */ - ptp->dev = device_create(ptp_class, parent, ptp->devid, ptp, - "ptp%d", ptp->index); + ptp->dev = device_create_with_groups(ptp_class, parent, ptp->devid, + ptp, ptp->pin_attr_groups, + "ptp%d", ptp->index); if (IS_ERR(ptp->dev)) goto no_device; - err = ptp_populate_sysfs(ptp); - if (err) - goto no_sysfs; - /* Register a new PPS source. */ if (info->pps) { struct pps_source_info pps; @@ -247,10 +248,10 @@ no_clock: if (ptp->pps_source) pps_unregister_source(ptp->pps_source); no_pps: - ptp_cleanup_sysfs(ptp); -no_sysfs: device_destroy(ptp_class, ptp->devid); no_device: + ptp_cleanup_pin_groups(ptp); +no_pin_groups: mutex_destroy(&ptp->tsevq_mux); mutex_destroy(&ptp->pincfg_mux); no_slot: @@ -268,8 +269,9 @@ int ptp_clock_unregister(struct ptp_cloc /* Release the clock's resources. */ if (ptp->pps_source) pps_unregister_source(ptp->pps_source); - ptp_cleanup_sysfs(ptp); + device_destroy(ptp_class, ptp->devid); + ptp_cleanup_pin_groups(ptp); posix_clock_unregister(&ptp->clock); return 0; --- a/drivers/ptp/ptp_private.h +++ b/drivers/ptp/ptp_private.h @@ -54,6 +54,8 @@ struct ptp_clock { struct device_attribute *pin_dev_attr; struct attribute **pin_attr; struct attribute_group pin_attr_group; + /* 1st entry is a pointer to the real group, 2nd is NULL terminator */ + const struct attribute_group *pin_attr_groups[2]; }; /* @@ -94,8 +96,7 @@ uint ptp_poll(struct posix_clock *pc, extern const struct attribute_group *ptp_groups[]; -int ptp_cleanup_sysfs(struct ptp_clock *ptp); - -int ptp_populate_sysfs(struct ptp_clock *ptp); +int ptp_populate_pin_groups(struct ptp_clock *ptp); +void ptp_cleanup_pin_groups(struct ptp_clock *ptp); #endif --- a/drivers/ptp/ptp_sysfs.c +++ b/drivers/ptp/ptp_sysfs.c @@ -268,25 +268,14 @@ static ssize_t ptp_pin_store(struct devi return count; } -int ptp_cleanup_sysfs(struct ptp_clock *ptp) +int ptp_populate_pin_groups(struct ptp_clock *ptp) { - struct device *dev = ptp->dev; - struct ptp_clock_info *info = ptp->info; - - if (info->n_pins) { - sysfs_remove_group(&dev->kobj, &ptp->pin_attr_group); - kfree(ptp->pin_attr); - kfree(ptp->pin_dev_attr); - } - return 0; -} - -static int ptp_populate_pins(struct ptp_clock *ptp) -{ - struct device *dev = ptp->dev; struct ptp_clock_info *info = ptp->info; int err = -ENOMEM, i, n_pins = info->n_pins; + if (!n_pins) + return 0; + ptp->pin_dev_attr = kzalloc(n_pins * sizeof(*ptp->pin_dev_attr), GFP_KERNEL); if (!ptp->pin_dev_attr) @@ -310,28 +299,18 @@ static int ptp_populate_pins(struct ptp_ ptp->pin_attr_group.name = "pins"; ptp->pin_attr_group.attrs = ptp->pin_attr; - err = sysfs_create_group(&dev->kobj, &ptp->pin_attr_group); - if (err) - goto no_group; + ptp->pin_attr_groups[0] = &ptp->pin_attr_group; + return 0; -no_group: - kfree(ptp->pin_attr); no_pin_attr: kfree(ptp->pin_dev_attr); no_dev_attr: return err; } -int ptp_populate_sysfs(struct ptp_clock *ptp) +void ptp_cleanup_pin_groups(struct ptp_clock *ptp) { - struct ptp_clock_info *info = ptp->info; - int err; - - if (info->n_pins) { - err = ptp_populate_pins(ptp); - if (err) - return err; - } - return 0; + kfree(ptp->pin_attr); + kfree(ptp->pin_dev_attr); }