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[209.132.180.67]) by mx.google.com with ESMTP id h22si2661359oie.15.2019.12.10.13.49.42; Tue, 10 Dec 2019 13:49:54 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=mijmnRVQ; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728221AbfLJVcX (ORCPT + 99 others); Tue, 10 Dec 2019 16:32:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:57498 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728087AbfLJVJP (ORCPT ); Tue, 10 Dec 2019 16:09:15 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2DDA224687; Tue, 10 Dec 2019 21:09:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576012154; bh=pghwgZMd4SWZs3qtgTbo4IgWuTXCjN4jCn4pl/oZLUY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mijmnRVQfcWQ5wRhAg8l2lIhLGdDo1g6HBQNWPlNfEy+NqXOaE45n6rpYKGjVARR+ IHNTJnrLEEMNOvwbAmT6Qx0VJ9OHb1xOedPEPxuHAbhAgQnQOsjbw4TZ6YxAScUbhf JPWYCQqV+16L/Rwxab3B8ffa8MEmg9YmZ5+F+OOw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alexandru Ardelean , Jonathan Cameron , Sasha Levin , linux-iio@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 117/350] iio: dac: ad7303: replace mlock with own lock Date: Tue, 10 Dec 2019 16:03:42 -0500 Message-Id: <20191210210735.9077-78-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191210210735.9077-1-sashal@kernel.org> References: <20191210210735.9077-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexandru Ardelean [ Upstream commit c991bf9b650f39481cf3c1137092d4754a2c75de ] This change replaces indio_dev's mlock with the driver's own lock. The lock is mostly needed to protect state when changing the `dac_cache` info. The lock has been extended to `ad7303_read_raw()`, to make sure that the cache is updated if an SPI-write is already in progress. Signed-off-by: Alexandru Ardelean Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/dac/ad7303.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/iio/dac/ad7303.c b/drivers/iio/dac/ad7303.c index 8de9f40226e62..14bbac6bee982 100644 --- a/drivers/iio/dac/ad7303.c +++ b/drivers/iio/dac/ad7303.c @@ -41,6 +41,7 @@ struct ad7303_state { struct regulator *vdd_reg; struct regulator *vref_reg; + struct mutex lock; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -79,7 +80,7 @@ static ssize_t ad7303_write_dac_powerdown(struct iio_dev *indio_dev, if (ret) return ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); if (pwr_down) st->config |= AD7303_CFG_POWER_DOWN(chan->channel); @@ -90,7 +91,7 @@ static ssize_t ad7303_write_dac_powerdown(struct iio_dev *indio_dev, * mode, so just write one of the DAC channels again */ ad7303_write(st, chan->channel, st->dac_cache[chan->channel]); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return len; } @@ -116,7 +117,9 @@ static int ad7303_read_raw(struct iio_dev *indio_dev, switch (info) { case IIO_CHAN_INFO_RAW: + mutex_lock(&st->lock); *val = st->dac_cache[chan->channel]; + mutex_unlock(&st->lock); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: vref_uv = ad7303_get_vref(st, chan); @@ -144,11 +147,11 @@ static int ad7303_write_raw(struct iio_dev *indio_dev, if (val >= (1 << chan->scan_type.realbits) || val < 0) return -EINVAL; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); ret = ad7303_write(st, chan->address, val); if (ret == 0) st->dac_cache[chan->channel] = val; - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); break; default: ret = -EINVAL; @@ -211,6 +214,8 @@ static int ad7303_probe(struct spi_device *spi) st->spi = spi; + mutex_init(&st->lock); + st->vdd_reg = devm_regulator_get(&spi->dev, "Vdd"); if (IS_ERR(st->vdd_reg)) return PTR_ERR(st->vdd_reg); -- 2.20.1