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SubjectRe: [PATCH 01/10] iio: imu: adis: rename txrx_lock -> state_lock
Date
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@kernel.org> wrote:
>
> > On Thu, 26 Sep 2019 14:18:03 +0300
> > Alexandru Ardelean <alexandru.ardelean@analog.com> 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@analog.com>
> >
> > 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;
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