diff options
| author | sayli karnik <karniksayli1995@gmail.com> | 2017-03-13 22:05:27 +0530 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-03-15 22:12:21 +0000 |
| commit | c63313c605c3edcbb9ee95afb5f42148d4e5eb26 (patch) | |
| tree | a806999deb9dc4911bbb6cdcd3ecf16f3f307dab /drivers/staging/iio | |
| parent | 8fa06c902ac91633b3354974f2a23668bb932067 (diff) | |
staging: iio: ad9834: Use private driver lock instead of mlock
iio_dev->mlock should be used by the IIO core only for protecting
device operating mode changes. ie. Changes between INDIO_DIRECT_MODE,
INDIO_BUFFER_* modes.
Replace mlock with a lock in the device's global data to protect
hardware state changes.
Signed-off-by: sayli karnik <karniksayli1995@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/staging/iio')
| -rw-r--r-- | drivers/staging/iio/frequency/ad9834.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c index f92ff7fef6f3..2dffe48035f3 100644 --- a/drivers/staging/iio/frequency/ad9834.c +++ b/drivers/staging/iio/frequency/ad9834.c @@ -63,6 +63,7 @@ * @msg: default spi message * @freq_xfer: tuning word spi transfer * @freq_msg: tuning word spi message + * @lock: protect sensor state * @data: spi transmit buffer * @freq_data: tuning word spi transmit buffer */ @@ -77,6 +78,7 @@ struct ad9834_state { struct spi_message msg; struct spi_transfer freq_xfer[2]; struct spi_message freq_msg; + struct mutex lock; /* protect sensor state */ /* * DMA (thus cache coherency maintenance) requires the @@ -149,7 +151,7 @@ static ssize_t ad9834_write(struct device *dev, if (ret) goto error_ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); switch ((u32)this_attr->address) { case AD9834_REG_FREQ0: case AD9834_REG_FREQ1: @@ -207,7 +209,7 @@ static ssize_t ad9834_write(struct device *dev, default: ret = -ENODEV; } - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); error_ret: return ret ? ret : len; @@ -224,7 +226,7 @@ static ssize_t ad9834_store_wavetype(struct device *dev, int ret = 0; bool is_ad9833_7 = (st->devid == ID_AD9833) || (st->devid == ID_AD9837); - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); switch ((u32)this_attr->address) { case 0: @@ -267,7 +269,7 @@ static ssize_t ad9834_store_wavetype(struct device *dev, st->data = cpu_to_be16(AD9834_REG_CMD | st->control); ret = spi_sync(st->spi, &st->msg); } - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret ? ret : len; } @@ -418,6 +420,7 @@ static int ad9834_probe(struct spi_device *spi) } spi_set_drvdata(spi, indio_dev); st = iio_priv(indio_dev); + mutex_init(&st->lock); st->mclk = pdata->mclk; st->spi = spi; st->devid = spi_get_device_id(spi)->driver_data; |