From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A549C004C9 for ; Tue, 7 May 2019 14:36:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 54B21214AE for ; Tue, 7 May 2019 14:36:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726851AbfEGOg2 (ORCPT ); Tue, 7 May 2019 10:36:28 -0400 Received: from mxout012.mail.hostpoint.ch ([217.26.49.172]:63402 "EHLO mxout012.mail.hostpoint.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726674AbfEGOg0 (ORCPT ); Tue, 7 May 2019 10:36:26 -0400 Received: from [10.0.2.46] (helo=asmtp013.mail.hostpoint.ch) by mxout012.mail.hostpoint.ch with esmtp (Exim 4.91 (FreeBSD)) (envelope-from ) id 1hO1Ce-000454-QD; Tue, 07 May 2019 16:36:20 +0200 Received: from [46.140.72.82] (helo=philippe-pc.toradex.int) by asmtp013.mail.hostpoint.ch with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91 (FreeBSD)) (envelope-from ) id 1hO1Ce-0008oW-Jv; Tue, 07 May 2019 16:36:20 +0200 X-Authenticated-Sender-Id: dev@pschenker.ch From: Philippe Schenker To: linux-iio@vger.kernel.org, Jonathan Cameron , Stefan Agner , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler Cc: Marcel Ziswiler , David Laight , dev@pschenker.ch, Philippe Schenker , Max Krummenacher , Alexandre Torgue , linux-kernel@vger.kernel.org, Lee Jones , Maxime Coquelin , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/5] iio: stmpe-adc: Reinit completion struct on begin conversion Date: Tue, 7 May 2019 16:36:12 +0200 Message-Id: <20190507143615.28477-2-dev@pschenker.ch> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190507143615.28477-1-dev@pschenker.ch> References: <20190507143615.28477-1-dev@pschenker.ch> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Philippe Schenker In some cases, the wait_completion got interrupted. This caused the error-handling to mutex_unlock the function. The before turned on interrupt then got called anyway. In the ISR then completion() was called causing wrong adc-values returned in a following adc-readout. Reinitialise completion struct to make sure the counter is zero when beginning a new adc-conversion. Signed-off-by: Philippe Schenker --- drivers/iio/adc/stmpe-adc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c index 9ec338ba3440..b3872eb37293 100644 --- a/drivers/iio/adc/stmpe-adc.c +++ b/drivers/iio/adc/stmpe-adc.c @@ -65,6 +65,8 @@ static int stmpe_read_voltage(struct stmpe_adc *info, mutex_lock(&info->lock); + reinit_completion(&info->completion); + info->channel = (u8)chan->channel; if (info->channel > STMPE_ADC_LAST_NR) { @@ -105,6 +107,8 @@ static int stmpe_read_temp(struct stmpe_adc *info, mutex_lock(&info->lock); + reinit_completion(&info->completion); + info->channel = (u8)chan->channel; if (info->channel != STMPE_TEMP_CHANNEL) { -- 2.21.0