From mboxrd@z Thu Jan 1 00:00:00 1970 From: Axel Lin Subject: [PATCH v2] acerhdf: fix resource reclaim in error path Date: Wed, 07 Jul 2010 16:39:31 +0800 Message-ID: <1278491971.12801.36.camel@mola> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pz0-f46.google.com ([209.85.210.46]:59109 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751196Ab0GGIjV (ORCPT ); Wed, 7 Jul 2010 04:39:21 -0400 Sender: platform-driver-x86-owner@vger.kernel.org List-ID: To: linux-kernel Cc: Peter Feuerer , Matthew Garrett , Andrew Morton , Borislav Petkov , Alexey Dobriyan , platform-driver-x86@vger.kernel.org This patch fix resource reclaim in below cases: 1. acerhdf_register_platform() does not properly handle platform_device_alloc() failure and platform_device_add() failure This patch adds error handing for acerhdf_register_platform(). 2. acerhdf_register_platform() return err with acerhdf_dev == NULL. as a result, acerhdf_unregister_platform() does not do resource reclaim in acerhdf_init() error path. This patch adds error handing for acerhdf_register_platform(), thus correct the error handing path in acerhdf_init(). goto out_err instead of err_unreg if acerhdf_register_platform() fail. 3. platform_device_del() should only used in error handling. Current implementation missed a platform_device_put() in acerhdf_exit. This patch fixes it by using platform_device_unregister() instead of platform_device_del() in acerhdf_unregister_platform. Signed-off-by: Axel Lin --- drivers/platform/x86/acerhdf.c | 23 ++++++++++++++++------- 1 files changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c index 7b2384d..d9f5ebb 100644 --- a/drivers/platform/x86/acerhdf.c +++ b/drivers/platform/x86/acerhdf.c @@ -579,17 +579,26 @@ static int acerhdf_register_platform(void) return err; acerhdf_dev = platform_device_alloc("acerhdf", -1); - platform_device_add(acerhdf_dev); + if (!acerhdf_dev) { + err = -ENOMEM; + goto err_device_alloc; + } + err = platform_device_add(acerhdf_dev); + if (err) + goto err_device_add; return 0; + +err_device_add: + platform_device_put(acerhdf_dev); +err_device_alloc: + platform_driver_unregister(&acerhdf_driver); + return err; } static void acerhdf_unregister_platform(void) { - if (!acerhdf_dev) - return; - - platform_device_del(acerhdf_dev); + platform_device_unregister(acerhdf_dev); platform_driver_unregister(&acerhdf_driver); } @@ -633,7 +642,7 @@ static int __init acerhdf_init(void) err = acerhdf_register_platform(); if (err) - goto err_unreg; + goto out_err; err = acerhdf_register_thermal(); if (err) @@ -646,7 +655,7 @@ err_unreg: acerhdf_unregister_platform(); out_err: - return -ENODEV; + return err; } static void __exit acerhdf_exit(void) -- 1.5.4.3