linux-kernel - Re: [PATCH v2 4/9] iio: imu: adis: add unlocked __adis_initial

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Date:   Fri, 14 Feb 2020 14:31:37 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <nuno.sa@...log.com>
Subject: Re: [PATCH v2 4/9] iio: imu: adis: add unlocked
 __adis_initial_startup()

On Mon, 10 Feb 2020 15:26:01 +0200
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> This change splits the __adis_initial_startup() away from
> adis_initial_startup(). The unlocked version can be used in certain calls
> during probe, where races won't happen since the ADIS driver may not be
> registered yet with IIO.
> 
> Signed-off-by: Nuno Sá <nuno.sa@...log.com>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Applied.  Thanks,

Jonathan

> ---
>  drivers/iio/imu/adis.c       | 14 ++++----------
>  include/linux/iio/imu/adis.h | 13 ++++++++++++-
>  2 files changed, 16 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
> index 022bb54fb748..e4897dad34ab 100644
> --- a/drivers/iio/imu/adis.c
> +++ b/drivers/iio/imu/adis.c
> @@ -365,7 +365,7 @@ static int adis_self_test(struct adis *adis)
>  }
>  
>  /**
> - * adis_inital_startup() - Performs device self-test
> + * __adis_initial_startup() - Device initial setup
>   * @adis: The adis device
>   *
>   * Returns 0 if the device is operational, a negative error code otherwise.
> @@ -373,28 +373,22 @@ static int adis_self_test(struct adis *adis)
>   * This function should be called early on in the device initialization sequence
>   * to ensure that the device is in a sane and known state and that it is usable.
>   */
> -int adis_initial_startup(struct adis *adis)
> +int __adis_initial_startup(struct adis *adis)
>  {
>  	int ret;
>  
> -	mutex_lock(&adis->state_lock);
> -
>  	ret = adis_self_test(adis);
>  	if (ret) {
>  		dev_err(&adis->spi->dev, "Self-test failed, trying reset.\n");
>  		__adis_reset(adis);
>  		ret = adis_self_test(adis);
> -		if (ret) {
> +		if (ret)
>  			dev_err(&adis->spi->dev, "Second self-test failed, giving up.\n");
> -			goto out_unlock;
> -		}
>  	}
>  
> -out_unlock:
> -	mutex_unlock(&adis->state_lock);
>  	return ret;
>  }
> -EXPORT_SYMBOL_GPL(adis_initial_startup);
> +EXPORT_SYMBOL_GPL(__adis_initial_startup);
>  
>  /**
>   * adis_single_conversion() - Performs a single sample conversion
> diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
> index d2fcf45b4cef..15e75670f923 100644
> --- a/include/linux/iio/imu/adis.h
> +++ b/include/linux/iio/imu/adis.h
> @@ -297,6 +297,7 @@ static inline int adis_read_reg_32(struct adis *adis, unsigned int reg,
>  
>  int adis_enable_irq(struct adis *adis, bool enable);
>  int __adis_check_status(struct adis *adis);
> +int __adis_initial_startup(struct adis *adis);
>  
>  static inline int adis_check_status(struct adis *adis)
>  {
> @@ -309,7 +310,17 @@ static inline int adis_check_status(struct adis *adis)
>  	return ret;
>  }
>  
> -int adis_initial_startup(struct adis *adis);
> +/* locked version of __adis_initial_startup() */
> +static inline int adis_initial_startup(struct adis *adis)
> +{
> +	int ret;
> +
> +	mutex_lock(&adis->state_lock);
> +	ret = __adis_initial_startup(adis);
> +	mutex_unlock(&adis->state_lock);
> +
> +	return ret;
> +}
>  
>  int adis_single_conversion(struct iio_dev *indio_dev,
>  	const struct iio_chan_spec *chan, unsigned int error_mask,