From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752384Ab2AYLf5 (ORCPT ); Wed, 25 Jan 2012 06:35:57 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:48358 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751958Ab2AYLf4 (ORCPT ); Wed, 25 Jan 2012 06:35:56 -0500 Date: Wed, 25 Jan 2012 12:35:38 +0100 From: Sylwester Nawrocki Subject: [PATCH/RFC] regulator: Reverse the disable sequence in regulator_bulk_disable() To: broonie@opensource.wolfsonmicro.com, lrg@ti.com Cc: linux-kernel@vger.kernel.org, m.szyprowski@samsung.com, Sylwester Nawrocki , Jaroslav Kysela , Takashi Iwai , Samuel Ortiz , Steve Glendinning , Richard Purdie , Timur Tabi , Kyungmin Park Message-id: <1327491338-18817-1-git-send-email-s.nawrocki@samsung.com> MIME-version: 1.0 X-Mailer: git-send-email 1.7.7.3 Content-type: TEXT/PLAIN Content-transfer-encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Often there is a need for disabling a set of regulators in order opposite to the enable order. Currently the function regulator_bulk_disable() walks list of regulators in same order as regulator_bulk_enable(). This may cause trouble, especially for devices with mixed analogue and digital circuits. So reverse the disabling sequence of regulator_bulk_disable(). While at it, also correct the comment. Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Samuel Ortiz Cc: Steve Glendinning Cc: Richard Purdie Cc: Timur Tabi Signed-off-by: Sylwester Nawrocki Signed-off-by: Kyungmin Park --- The alternatives to directly modifying regulator_bulk_disable() could be: - re-implement it in modules that need the order reversed; it is not really helpful in practice since such code would have to be repeated in multiple modules; - create new function, e.g. regulator_bulk_disable_reversed() with the order reversed - not sure if it is not an overkill though; --- drivers/regulator/core.c | 8 ++++---- 1 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e9a83f8..67db4a6 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2463,8 +2463,8 @@ EXPORT_SYMBOL_GPL(regulator_bulk_enable); * @return 0 on success, an errno on failure * * This convenience API allows consumers to disable multiple regulator - * clients in a single API call. If any consumers cannot be enabled - * then any others that were disabled will be disabled again prior to + * clients in a single API call. If any consumers cannot be disabled + * then any others that were disabled will be enabled again prior to * return. */ int regulator_bulk_disable(int num_consumers, @@ -2473,7 +2473,7 @@ int regulator_bulk_disable(int num_consumers, int i; int ret; - for (i = 0; i < num_consumers; i++) { + for (i = num_consumers - 1; i >= 0; --i) { ret = regulator_disable(consumers[i].consumer); if (ret != 0) goto err; @@ -2483,7 +2483,7 @@ int regulator_bulk_disable(int num_consumers, err: pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); - for (--i; i >= 0; --i) + for (++i; i < num_consumers; ++i) regulator_enable(consumers[i].consumer); return ret; -- 1.7.8.3