On Sun, 2019-10-06 at 10:06 +0100, Jonathan Cameron wrote: > [External] > > On Sun, 6 Oct 2019 09:53:33 +0100 > Jonathan Cameron <jic23@xxxxxxxxxx> wrote: > > > On Thu, 26 Sep 2019 14:18:03 +0300 > > Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote: > > > > > The lock can be extended a bit to protect other elements that are not > > > particular to just TX/RX. Another idea would have been to just add a > > > new > > > `state_lock`, but that would mean 2 locks which would be redundant, > > > and > > > probably cause more potential for dead-locks. > > > > > > What will be done in the next patches, will be to add some unlocked > > > versions for read/write_reg functions. > > > > > > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> > > > > Would be good to document the scope of the lock as a comment when it > > is defined. What exactly is 'state' in this case? > As this can be done as a follow up and the rest of the series is fine > as is... > Will do. > Applied to the togreg branch of iio.git and pushed out as testing for > the autobuilders to play with it. > > Thanks, > > Jonathan > > > Thanks, > > > > Jonathan > > > > > --- > > > drivers/iio/imu/adis.c | 10 +++++----- > > > drivers/iio/imu/adis_buffer.c | 4 ++-- > > > include/linux/iio/imu/adis.h | 2 +- > > > 3 files changed, 8 insertions(+), 8 deletions(-) > > > > > > diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c > > > index 1631c255deab..3c2d896e3a96 100644 > > > --- a/drivers/iio/imu/adis.c > > > +++ b/drivers/iio/imu/adis.c > > > @@ -70,7 +70,7 @@ int adis_write_reg(struct adis *adis, unsigned int > > > reg, > > > }, > > > }; > > > > > > - mutex_lock(&adis->txrx_lock); > > > + mutex_lock(&adis->state_lock); > > > > > > spi_message_init(&msg); > > > > > > @@ -114,7 +114,7 @@ int adis_write_reg(struct adis *adis, unsigned > > > int reg, > > > } > > > > > > out_unlock: > > > - mutex_unlock(&adis->txrx_lock); > > > + mutex_unlock(&adis->state_lock); > > > > > > return ret; > > > } > > > @@ -166,7 +166,7 @@ int adis_read_reg(struct adis *adis, unsigned int > > > reg, > > > }, > > > }; > > > > > > - mutex_lock(&adis->txrx_lock); > > > + mutex_lock(&adis->state_lock); > > > spi_message_init(&msg); > > > > > > if (adis->current_page != page) { > > > @@ -211,7 +211,7 @@ int adis_read_reg(struct adis *adis, unsigned int > > > reg, > > > } > > > > > > out_unlock: > > > - mutex_unlock(&adis->txrx_lock); > > > + mutex_unlock(&adis->state_lock); > > > > > > return ret; > > > } > > > @@ -437,7 +437,7 @@ EXPORT_SYMBOL_GPL(adis_single_conversion); > > > int adis_init(struct adis *adis, struct iio_dev *indio_dev, > > > struct spi_device *spi, const struct adis_data *data) > > > { > > > - mutex_init(&adis->txrx_lock); > > > + mutex_init(&adis->state_lock); > > > adis->spi = spi; > > > adis->data = data; > > > iio_device_set_drvdata(indio_dev, adis); > > > diff --git a/drivers/iio/imu/adis_buffer.c > > > b/drivers/iio/imu/adis_buffer.c > > > index 9ac8356d9a95..bf581a2c321d 100644 > > > --- a/drivers/iio/imu/adis_buffer.c > > > +++ b/drivers/iio/imu/adis_buffer.c > > > @@ -123,7 +123,7 @@ static irqreturn_t adis_trigger_handler(int irq, > > > void *p) > > > return -ENOMEM; > > > > > > if (adis->data->has_paging) { > > > - mutex_lock(&adis->txrx_lock); > > > + mutex_lock(&adis->state_lock); > > > if (adis->current_page != 0) { > > > adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID); > > > adis->tx[1] = 0; > > > @@ -138,7 +138,7 @@ static irqreturn_t adis_trigger_handler(int irq, > > > void *p) > > > > > > if (adis->data->has_paging) { > > > adis->current_page = 0; > > > - mutex_unlock(&adis->txrx_lock); > > > + mutex_unlock(&adis->state_lock); > > > } > > > > > > iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer, > > > diff --git a/include/linux/iio/imu/adis.h > > > b/include/linux/iio/imu/adis.h > > > index 4c53815bb729..3ed5eceaac2d 100644 > > > --- a/include/linux/iio/imu/adis.h > > > +++ b/include/linux/iio/imu/adis.h > > > @@ -61,7 +61,7 @@ struct adis { > > > const struct adis_data *data; > > > struct adis_burst *burst; > > > > > > - struct mutex txrx_lock; > > > + struct mutex state_lock; > > > struct spi_message msg; > > > struct spi_transfer *xfer; > > > unsigned int current_page;