Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965990Ab3HHRdT (ORCPT ); Thu, 8 Aug 2013 13:33:19 -0400 Received: from avon.wwwdotorg.org ([70.85.31.133]:54798 "EHLO avon.wwwdotorg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757724Ab3HHRdR (ORCPT ); Thu, 8 Aug 2013 13:33:17 -0400 Message-ID: <5203D659.4050907@wwwdotorg.org> Date: Thu, 08 Aug 2013 11:33:13 -0600 From: Stephen Warren User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130803 Thunderbird/17.0.8 MIME-Version: 1.0 To: Guenter Roeck CC: Wei Ni , "khali@linux-fr.org" , Matthew Longnecker , "linux-arm-kernel@lists.infradead.org" , "lm-sensors@lm-sensors.org" , "linux-kernel@vger.kernel.org" , "linux-tegra@vger.kernel.org" Subject: Re: [PATCH v2 1/3] hwmon: (lm90) Add power control References: <1375944991-29182-1-git-send-email-wni@nvidia.com> <1375944991-29182-2-git-send-email-wni@nvidia.com> <520359E9.1000600@roeck-us.net> <52036920.4050808@nvidia.com> <52037F9A.7070802@roeck-us.net> In-Reply-To: <52037F9A.7070802@roeck-us.net> X-Enigmail-Version: 1.4.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 925 Lines: 30 On 08/08/2013 05:23 AM, Guenter Roeck wrote: > On 08/08/2013 02:47 AM, Wei Ni wrote: ... >> I think get_regulator() will return error values, not only >> -EPROBE_DEFER, so we should set data->lm90_reg to NULL to handle other >> error values. >> > Matter of opinion if you want to check for IS_ERR or NULL later on. No, if regulator returns either: * Something valid * Someting IS_ERR() ... then everywhere has to check the value using IS_ERR(). If regulator returns either: * Something valid * Someting NULL ... then everywhere has to check the value against NULL. checking against both IS_ERR() and NULL shouldn't ever happen, and likewise IS_ERR_OR_NULL() is deprecated. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/