From patchwork Fri Dec 4 21:49:17 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 7771971 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3AA179F30B for ; Fri, 4 Dec 2015 21:50:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6B7442061F for ; Fri, 4 Dec 2015 21:50:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 795932061D for ; Fri, 4 Dec 2015 21:50:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756659AbbLDVtl (ORCPT ); Fri, 4 Dec 2015 16:49:41 -0500 Received: from mga09.intel.com ([134.134.136.24]:54491 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756644AbbLDVtj (ORCPT ); Fri, 4 Dec 2015 16:49:39 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP; 04 Dec 2015 13:49:36 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,382,1444719600"; d="scan'208";a="854211144" Received: from black.fi.intel.com ([10.237.72.93]) by fmsmga001.fm.intel.com with ESMTP; 04 Dec 2015 13:49:28 -0800 Received: by black.fi.intel.com (Postfix, from userid 1003) id 3F1AB48; Fri, 4 Dec 2015 23:49:27 +0200 (EET) From: Andy Shevchenko To: "Rafael J . Wysocki" , linux-acpi@vger.kernel.org, Vinod Koul , dmaengine@vger.kernel.org, Thomas Gleixner , Greg Kroah-Hartman , Jarkko Nikula , linux-kernel@vger.kernel.org, Mika Westerberg Cc: Andy Shevchenko Subject: [PATCH v3 1/9] device core: add BUS_NOTIFY_DRIVER_NOT_BOUND notification Date: Fri, 4 Dec 2015 23:49:17 +0200 Message-Id: <1449265765-9393-2-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1449265765-9393-1-git-send-email-andriy.shevchenko@linux.intel.com> References: <1449265765-9393-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The users of BUS_NOTIFY_BIND_DRIVER have no chance to do any cleanup in case of a probe failure. In the result there might be problems, such as some resources that had been allocated will continue to be allocated and therefore lead to a resource leak. Introduce a new notification to inform the subscriber that ->probe() failed. Do the same in case of failed device_bind_driver() call. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 10 ++++++++-- include/linux/device.h | 1 + 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 8d4eb4d..7399be7 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -299,6 +299,9 @@ int device_bind_driver(struct device *dev) ret = driver_sysfs_add(dev); if (!ret) driver_bound(dev); + else if (dev->bus) + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, + BUS_NOTIFY_DRIVER_NOT_BOUND, dev); return ret; } EXPORT_SYMBOL_GPL(device_bind_driver); @@ -332,7 +335,7 @@ static int really_probe(struct device *dev, struct device_driver *drv) /* If using pinctrl, bind pins now before probing */ ret = pinctrl_bind_pins(dev); if (ret) - goto probe_failed; + goto pinctrl_bind_failed; if (driver_sysfs_add(dev)) { printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", @@ -376,6 +379,10 @@ static int really_probe(struct device *dev, struct device_driver *drv) goto done; probe_failed: + if (dev->bus) + blocking_notifier_call_chain(&dev->bus->p->bus_notifier, + BUS_NOTIFY_DRIVER_NOT_BOUND, dev); +pinctrl_bind_failed: devres_release_all(dev); driver_sysfs_remove(dev); dev->driver = NULL; @@ -749,7 +756,6 @@ static void __device_release_driver(struct device *dev) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_UNBOUND_DRIVER, dev); - } } diff --git a/include/linux/device.h b/include/linux/device.h index b8f411b..f627ba2 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -191,6 +191,7 @@ extern int bus_unregister_notifier(struct bus_type *bus, unbound */ #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound from the device */ +#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */ extern struct kset *bus_get_kset(struct bus_type *bus); extern struct klist *bus_get_device_klist(struct bus_type *bus);