From: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
To: <linux-kernel@vger.kernel.org>, <linux-iio@vger.kernel.org>
Cc: Sergiu Cuciurean <sergiu.cuciurean@analog.com>,
Lars-Peter Clausen <lars@metafoo.de>,
Michael Hennerich <Michael.Hennerich@analog.com>,
Stefan Popa <stefan.popa@analog.com>,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Subject: [PATCH] iio: dac: ad5764: Replace indio_dev->mlock with own device lock
Date: Thu, 14 May 2020 12:12:12 +0300 [thread overview]
Message-ID: <20200514091215.80958-1-sergiu.cuciurean@analog.com> (raw)
As part of the general cleanup of indio_dev->mlock, this change replaces
it with a local lock on the device's state structure.
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
---
drivers/iio/dac/ad5764.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/dac/ad5764.c b/drivers/iio/dac/ad5764.c
index f7ab211604a1..5b0f0fe354f6 100644
--- a/drivers/iio/dac/ad5764.c
+++ b/drivers/iio/dac/ad5764.c
@@ -46,6 +46,7 @@ struct ad5764_chip_info {
* @spi: spi_device
* @chip_info: chip info
* @vref_reg: vref supply regulators
+ * @lock lock to protect the data buffer during SPI ops
* @data: spi transfer buffers
*/
@@ -53,6 +54,7 @@ struct ad5764_state {
struct spi_device *spi;
const struct ad5764_chip_info *chip_info;
struct regulator_bulk_data vref_reg[2];
+ struct mutex lock;
/*
* DMA (thus cache coherency maintenance) requires the
@@ -126,11 +128,11 @@ static int ad5764_write(struct iio_dev *indio_dev, unsigned int reg,
struct ad5764_state *st = iio_priv(indio_dev);
int ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->data[0].d32 = cpu_to_be32((reg << 16) | val);
ret = spi_write(st->spi, &st->data[0].d8[1], 3);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -151,7 +153,7 @@ static int ad5764_read(struct iio_dev *indio_dev, unsigned int reg,
},
};
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));
@@ -159,7 +161,7 @@ static int ad5764_read(struct iio_dev *indio_dev, unsigned int reg,
if (ret >= 0)
*val = be32_to_cpu(st->data[1].d32) & 0xffff;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -295,6 +297,8 @@ static int ad5764_probe(struct spi_device *spi)
indio_dev->num_channels = AD5764_NUM_CHANNELS;
indio_dev->channels = st->chip_info->channels;
+ mutex_init(&st->lock);
+
if (st->chip_info->int_vref == 0) {
st->vref_reg[0].supply = "vrefAB";
st->vref_reg[1].supply = "vrefCD";
--
2.17.1
next reply other threads:[~2020-05-14 9:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 9:12 Sergiu Cuciurean [this message]
2020-05-16 15:25 ` [PATCH] iio: dac: ad5764: Replace indio_dev->mlock with own device lock Jonathan Cameron
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200514091215.80958-1-sergiu.cuciurean@analog.com \
--to=sergiu.cuciurean@analog.com \
--cc=Michael.Hennerich@analog.com \
--cc=jic23@kernel.org \
--cc=knaack.h@gmx.de \
--cc=lars@metafoo.de \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pmeerw@pmeerw.net \
--cc=stefan.popa@analog.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).