From 9318a9e547438078104b0e8557f76f0cb524c12e Mon Sep 17 00:00:00 2001 From: Alexandru Ardelean Date: Thu, 19 Sep 2019 16:23:03 +0300 Subject: [PATCH] iio: gyro: adis16080: replace mlock with own lock The lock is used to protect the buffer during reads. Though the spi routines have their own locks, it may be the case that the buffer needs to be protected before it's stored and passed to the IIO read hooks. indio_dev's mlock was used before. This change replaces it with the driver's own lock. Signed-off-by: Alexandru Ardelean Signed-off-by: Jonathan Cameron --- drivers/iio/gyro/adis16080.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/iio/gyro/adis16080.c b/drivers/iio/gyro/adis16080.c index 236220d6de02..1b84b8e112fe 100644 --- a/drivers/iio/gyro/adis16080.c +++ b/drivers/iio/gyro/adis16080.c @@ -38,10 +38,12 @@ struct adis16080_chip_info { * @us: actual spi_device to write data * @info: chip specific parameters * @buf: transmit or receive buffer + * @lock lock to protect buffer during reads **/ struct adis16080_state { struct spi_device *us; const struct adis16080_chip_info *info; + struct mutex lock; __be16 buf ____cacheline_aligned; }; @@ -82,9 +84,9 @@ static int adis16080_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: - mutex_lock(&indio_dev->mlock); + mutex_lock(&st->lock); ret = adis16080_read_sample(indio_dev, chan->address, val); - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&st->lock); return ret ? ret : IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: switch (chan->type) { @@ -196,6 +198,8 @@ static int adis16080_probe(struct spi_device *spi) /* this is only used for removal purposes */ spi_set_drvdata(spi, indio_dev); + mutex_init(&st->lock); + /* Allocate the comms buffers */ st->us = spi; st->info = &adis16080_chip_info[id->driver_data];