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Date:   Sat, 29 Aug 2020 16:48:19 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>
Subject: Re: [PATCH] iio: frequency: adf4350: Replace indio_dev->mlock with
 own device lock

On Wed, 26 Aug 2020 09:42:57 +0300
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> From: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
> 
> As part of the general cleanup of indio_dev->mlock, this change replaces
> it with a local lock on the device's state structure.
> 
> Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> ---
>  drivers/iio/frequency/adf4350.c | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
> index 409c9c47161e..3f37a57cd3c3 100644
> --- a/drivers/iio/frequency/adf4350.c
> +++ b/drivers/iio/frequency/adf4350.c
> @@ -47,6 +47,7 @@ struct adf4350_state {
>  	unsigned long			regs[6];
>  	unsigned long			regs_hw[6];
>  	unsigned long long		freq_req;
> +	struct mutex			lock;
Same thing about need for a comment in the code on what the lock scope is.
I'm sure checkpatch used to moan about this.  I guess maybe it stopped
doing so at some stage.

Jonathan

>  	/*
>  	 * DMA (thus cache coherency maintenance) requires the
>  	 * transfer buffers to live in their own cache lines.
> @@ -99,7 +100,7 @@ static int adf4350_reg_access(struct iio_dev *indio_dev,
>  	if (reg > ADF4350_REG5)
>  		return -EINVAL;
>  
> -	mutex_lock(&indio_dev->mlock);
> +	mutex_lock(&st->lock);
>  	if (readval == NULL) {
>  		st->regs[reg] = writeval & ~(BIT(0) | BIT(1) | BIT(2));
>  		ret = adf4350_sync_config(st);
> @@ -107,7 +108,7 @@ static int adf4350_reg_access(struct iio_dev *indio_dev,
>  		*readval =  st->regs_hw[reg];
>  		ret = 0;
>  	}
> -	mutex_unlock(&indio_dev->mlock);
> +	mutex_unlock(&st->lock);
>  
>  	return ret;
>  }
> @@ -254,7 +255,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
>  	if (ret)
>  		return ret;
>  
> -	mutex_lock(&indio_dev->mlock);
> +	mutex_lock(&st->lock);
>  	switch ((u32)private) {
>  	case ADF4350_FREQ:
>  		ret = adf4350_set_freq(st, readin);
> @@ -295,7 +296,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
>  	default:
>  		ret = -EINVAL;
>  	}
> -	mutex_unlock(&indio_dev->mlock);
> +	mutex_unlock(&st->lock);
>  
>  	return ret ? ret : len;
>  }
> @@ -309,7 +310,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
>  	unsigned long long val;
>  	int ret = 0;
>  
> -	mutex_lock(&indio_dev->mlock);
> +	mutex_lock(&st->lock);
>  	switch ((u32)private) {
>  	case ADF4350_FREQ:
>  		val = (u64)((st->r0_int * st->r1_mod) + st->r0_fract) *
> @@ -338,7 +339,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
>  		ret = -EINVAL;
>  		val = 0;
>  	}
> -	mutex_unlock(&indio_dev->mlock);
> +	mutex_unlock(&st->lock);
>  
>  	return ret < 0 ? ret : sprintf(buf, "%llu\n", val);
>  }
> @@ -539,6 +540,8 @@ static int adf4350_probe(struct spi_device *spi)
>  	indio_dev->channels = &adf4350_chan;
>  	indio_dev->num_channels = 1;
>  
> +	mutex_init(&st->lock);
> +
>  	st->chspc = pdata->channel_spacing;
>  	if (clk) {
>  		st->clk = clk;

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