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SubjectRe: [PATCH 01/10] iio: imu: adis: rename txrx_lock -> state_lock
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?

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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