From patchwork Mon Mar 6 07:04:30 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 9605161 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AF6CC6046A for ; Mon, 6 Mar 2017 07:06:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BFAC26E81 for ; Mon, 6 Mar 2017 07:06:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8F1AA27CF3; Mon, 6 Mar 2017 07:06:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3D13826E81 for ; Mon, 6 Mar 2017 07:06:59 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 3746680336; Sun, 5 Mar 2017 23:06:59 -0800 (PST) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received: from ale.deltatee.com (ale.deltatee.com [207.54.116.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 960DD80332 for ; Sun, 5 Mar 2017 23:06:57 -0800 (PST) Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1ckmhe-0007ox-07; Mon, 06 Mar 2017 00:05:09 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.84_2) (envelope-from ) id 1ckmhP-0000iB-KS; Mon, 06 Mar 2017 00:04:51 -0700 From: Logan Gunthorpe To: Greg Kroah-Hartman , Dan Williams , Alexander Viro , Johannes Thumshirn , Jan Kara , Arnd Bergmann , Sajjan Vikas C , Dmitry Torokhov , Linus Walleij , Alexandre Courbot , Peter Huewe , Marcel Selhorst , Jarkko Sakkinen , Jason Gunthorpe , Olof Johansson , Doug Ledford , Sean Hefty , Hal Rosenstock , Dmitry Vyukov , Haggai Eran , Parav Pandit , Leon Romanovsky , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Hans Verkuil , Mauro Carvalho Chehab , Artem Bityutskiy , Richard Weinberger , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Cyrille Pitchen , Matt Porter , Alexandre Bounine , Andrew Morton , Joe Perches , Lorenzo Stoakes , Vladimir Zapolskiy , Alessandro Zummo , Alexandre Belloni , Boaz Harrosh , "James E.J. Bottomley" , "Martin K. Petersen" , Stephen Bates , Bjorn Helgaas Date: Mon, 6 Mar 2017 00:04:30 -0700 Message-Id: <1488783873-2614-15-git-send-email-logang@deltatee.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1488783873-2614-1-git-send-email-logang@deltatee.com> References: <1488783873-2614-1-git-send-email-logang@deltatee.com> X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: gregkh@linuxfoundation.org, viro@zeniv.linux.org.uk, jthumshirn@suse.de, jack@suse.cz, arnd@arndb.de, vikas.cha.sajjan@hpe.com, linus.walleij@linaro.org, tpmdd@selhorst.net, jarkko.sakkinen@linux.intel.com, jgunthorpe@obsidianresearch.com, olof@lixom.net, dledford@redhat.com, dan.j.williams@intel.com, sean.hefty@intel.com, haggaie@mellanox.com, peterhuewe@gmx.de, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, hans.verkuil@cisco.com, leon@kernel.org, mchehab@kernel.org, richard@nod.at, dwmw2@infradead.org, cyrille.pitchen@atmel.com, mporter@kernel.crashing.org, alexandre.bounine@idt.com, akpm@linux-foundation.org, joe@perches.com, dmitry.torokhov@gmail.com, gnurou@gmail.com, hal.rosenstock@gmail.com, pandit.parav@gmail.com, dedekind1@gmail.com, computersforpeace@gmail.com, marek.vasut@gmail.com, lstoakes@gmail.com, vz@mleia.com, a.zummo@towertech.it, boris.brezillon@free-electrons.com, alexandre.belloni@free-electrons.com, ooo@electrozaur.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com, stephen.bates@microsemi.com, dvyukov@google.com, bhelgaas@google.com, rtc-linux@googlegroups.com, linux-mtd@lists.infradead.org, linux-nvdimm@lists.01.org, linux-pci@vger.kernel.org, linux-scsi@vger.kernel.org, linux-media@vger.kernel.org, linux-iio@vger.kernel.org, linux-rdma@vger.kernel.org, linux-gpio@vger.kernel.org, linux-input@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 14/16] rtc: utilize new cdev_device_add helper function X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-scsi@vger.kernel.org, rtc-linux@googlegroups.com, linux-gpio@vger.kernel.org, linux-iio@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-mtd@lists.infradead.org, linux-input@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-media@vger.kernel.org MIME-Version: 1.0 Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Mostly straightforward, but we had to remove the rtc_dev_add/del_device functions as they split up the cdev_add and the device_add. Doing this also revealed that there was likely another subtle bug: seeing cdev_add was done after device_register, the cdev probably was not ready before device_add when the uevent occurs. This would race with userspace, if it tried to use the device directly after the uevent. This is fixed just by using the new helper function. Signed-off-by: Logan Gunthorpe Acked-by: Alexandre Belloni --- drivers/rtc/class.c | 14 ++++++++++---- drivers/rtc/rtc-dev.c | 17 ----------------- 2 files changed, 10 insertions(+), 21 deletions(-) diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 74fd974..5fb4398 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -195,6 +195,8 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev, goto exit_ida; } + device_initialize(&rtc->dev); + rtc->id = id; rtc->ops = ops; rtc->owner = owner; @@ -233,14 +235,19 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev, rtc_dev_prepare(rtc); - err = device_register(&rtc->dev); + err = cdev_device_add(&rtc->char_dev, &rtc->dev); if (err) { + dev_warn(&rtc->dev, "%s: failed to add char device %d:%d\n", + rtc->name, MAJOR(rtc->dev.devt), rtc->id); + /* This will free both memory and the ID */ put_device(&rtc->dev); goto exit; + } else { + dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", rtc->name, + MAJOR(rtc->dev.devt), rtc->id); } - rtc_dev_add_device(rtc); rtc_proc_add_device(rtc); dev_info(dev, "rtc core: registered %s as %s\n", @@ -271,9 +278,8 @@ void rtc_device_unregister(struct rtc_device *rtc) * Remove innards of this RTC, then disable it, before * letting any rtc_class_open() users access it again */ - rtc_dev_del_device(rtc); rtc_proc_del_device(rtc); - device_del(&rtc->dev); + cdev_device_del(&rtc->char_dev, &rtc->dev); rtc->ops = NULL; mutex_unlock(&rtc->ops_lock); put_device(&rtc->dev); diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 6dc8f29..e81a871 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -477,23 +477,6 @@ void rtc_dev_prepare(struct rtc_device *rtc) cdev_init(&rtc->char_dev, &rtc_dev_fops); rtc->char_dev.owner = rtc->owner; - rtc->char_dev.kobj.parent = &rtc->dev.kobj; -} - -void rtc_dev_add_device(struct rtc_device *rtc) -{ - if (cdev_add(&rtc->char_dev, rtc->dev.devt, 1)) - dev_warn(&rtc->dev, "%s: failed to add char device %d:%d\n", - rtc->name, MAJOR(rtc_devt), rtc->id); - else - dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", rtc->name, - MAJOR(rtc_devt), rtc->id); -} - -void rtc_dev_del_device(struct rtc_device *rtc) -{ - if (rtc->dev.devt) - cdev_del(&rtc->char_dev); } void __init rtc_dev_init(void)