From patchwork Mon Sep 9 09:56:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Nyekjaer X-Patchwork-Id: 11137601 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0434776 for ; Mon, 9 Sep 2019 09:56:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6F2121A4C for ; Mon, 9 Sep 2019 09:56:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=geanix.com header.i=@geanix.com header.b="bze3XWQv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390100AbfIIJ4e (ORCPT ); Mon, 9 Sep 2019 05:56:34 -0400 Received: from first.geanix.com ([116.203.34.67]:49810 "EHLO first.geanix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390099AbfIIJ4e (ORCPT ); Mon, 9 Sep 2019 05:56:34 -0400 Received: from zen.localdomain (unknown [85.184.140.241]) by first.geanix.com (Postfix) with ESMTPSA id 854FF2D7; Mon, 9 Sep 2019 09:56:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=geanix.com; s=first; t=1568022964; bh=R5cG56f0q+XDCR3ctVXu3+cAUW1m2hVyyIMFOwh0VCM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bze3XWQv/ueac37Jz7A8QJzWHY5wVqBFn17O5Fs2NluSeeHT5mBmSYzYeMVnMHhvZ EXxa9Z47JooQs9AvbsIipo8I5so2gDzEq8De4gd/R/3StlSWJMOoEWyAF0CFTCZJee jB6lvzMX4E4cLNkebWaSKgGZHcjmuptqcTlGFmaXE/jhJPok6DJqlOnZEWCFECqHdX DNfib3SHF9K7zjfx2KbI+YM+CEulgWlgsKDGM0RxEH95Bo0wIa05wTuC//jAaPBqHI PLmUtDnI67nA253KPu28vpIBwRnz2wF74896wFHJ9p8z753IEwOB9oM0xYizAJaXMS oHdr4bwyZL8lA== From: Sean Nyekjaer To: linux-iio@vger.kernel.org, jic23@kernel.org, lorenzo.bianconi83@gmail.com Cc: Sean Nyekjaer , denis.ciocca@st.com, mario.tesi@st.com, armando.visconti@st.com, martin@geanix.com Subject: [PATCH v5.1 6/6] iio: imu: st_lsm6dsx: prohibit the use of events and buffered reads simultaneously Date: Mon, 9 Sep 2019 11:56:18 +0200 Message-Id: <20190909095618.70801-1-sean@geanix.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190909094506.51792-6-sean@geanix.com> References: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=4.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,UNPARSEABLE_RELAY,URIBL_BLOCKED autolearn=disabled version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on 77834cc0481d Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org When events and buffered reads is enabled simultaneously, and the first event accours the interrupt pin stays high. This can be reverted when we find a solution to allow events and buffered reads simultaneously. Signed-off-by: Sean Nyekjaer --- Changes since v4: * Use fifo configuration mutex to prevent a race in hw->enable_event check. Changes since v5: * Updated do not return without unlocking mutexes drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 5 +++++ drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 13 ++++++++++--- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c index ef579650fd52..b87a1872bc60 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c @@ -603,6 +603,11 @@ int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable) mutex_lock(&hw->conf_lock); + if (hw->enable_event) { + err = -EBUSY; + goto out; + } + if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) { err = st_lsm6dsx_flush_fifo(hw); if (err < 0) diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c index 00ba14d15c13..a13d0c154b82 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -1340,8 +1340,12 @@ static int st_lsm6dsx_write_event_config(struct iio_dev *iio_dev, if (type != IIO_EV_TYPE_THRESH) return -EINVAL; - if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) - return -EBUSY; + mutex_unlock(&hw->conf_lock); + + if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) { + err = -EBUSY; + goto out; + } /* do not enable events if they are already enabled */ if (state && hw->enable_event) @@ -1357,7 +1361,10 @@ static int st_lsm6dsx_write_event_config(struct iio_dev *iio_dev, hw->enable_event = state; - return 0; +out: + mutex_unlock(&hw->conf_lock); + + return err; } int st_lsm6dsx_set_watermark(struct iio_dev *iio_dev, unsigned int val)