linux-kernel - Re: [RFC PATCH 09/14] iio: buffer: split buffer sysfs creation to take buffer as primary arg

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Date:   Mon, 25 May 2020 07:28:18 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "jic23@...nel.org" <jic23@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "lars@...afoo.de" <lars@...afoo.de>
Subject: Re: [RFC PATCH 09/14] iio: buffer: split buffer sysfs creation to
 take buffer as primary arg

On Sun, 2020-05-24 at 17:49 +0100, Jonathan Cameron wrote:
> [External]
> 
> On Fri, 8 May 2020 16:53:43 +0300
> Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:
> 
> > Currently the iio_buffer_{alloc,free}_sysfs_and_mask() take 'indio_dev' as
> > primary argument. This change converts to take an IIO buffer as a primary
> > argument.
> > 
> > That will allow the functions to get called for multiple buffers.
> > 
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> 
> Looks good to me.  We'll need this whatever the interface ends up being as
> need the separate control infrastructure.

I was wanting to split this into it's own patch at some point and send it now.
I'll probably do it.

> 
> Jonathan
> 
> > ---
> >  drivers/iio/industrialio-buffer.c | 46 ++++++++++++++++++++-----------
> >  1 file changed, 30 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-
> > buffer.c
> > index e7a847e7b103..6b1b5d5387bd 100644
> > --- a/drivers/iio/industrialio-buffer.c
> > +++ b/drivers/iio/industrialio-buffer.c
> > @@ -1312,26 +1312,14 @@ static struct attribute *iio_buffer_attrs[] = {
> >  	&dev_attr_data_available.attr,
> >  };
> >  
> > -int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> > +static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer)
> >  {
> > +	struct iio_dev *indio_dev = buffer->indio_dev;
> >  	struct iio_dev_attr *p;
> >  	struct attribute **attr;
> > -	struct iio_buffer *buffer = indio_dev->buffer;
> >  	int ret, i, attrn, attrcount, attrcount_orig = 0;
> >  	const struct iio_chan_spec *channels;
> >  
> > -	channels = indio_dev->channels;
> > -	if (channels) {
> > -		int ml = indio_dev->masklength;
> > -
> > -		for (i = 0; i < indio_dev->num_channels; i++)
> > -			ml = max(ml, channels[i].scan_index + 1);
> > -		indio_dev->masklength = ml;
> > -	}
> > -
> > -	if (!buffer)
> > -		return 0;
> > -
> >  	attrcount = 0;
> >  	if (buffer->attrs) {
> >  		while (buffer->attrs[attrcount] != NULL)
> > @@ -1411,19 +1399,45 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev
> > *indio_dev)
> >  	return ret;
> >  }
> >  
> > -void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
> > +int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
> >  {
> >  	struct iio_buffer *buffer = indio_dev->buffer;
> > +	const struct iio_chan_spec *channels;
> > +	int i;
> > +
> > +	channels = indio_dev->channels;
> > +	if (channels) {
> > +		int ml = indio_dev->masklength;
> > +
> > +		for (i = 0; i < indio_dev->num_channels; i++)
> > +			ml = max(ml, channels[i].scan_index + 1);
> > +		indio_dev->masklength = ml;
> > +	}
> >  
> >  	if (!buffer)
> > -		return;
> > +		return 0;
> > +
> > +	return __iio_buffer_alloc_sysfs_and_mask(buffer);
> > +}
> >  
> > +static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer)
> > +{
> >  	iio_buffer_free_scanmask(buffer);
> >  	kfree(buffer->buffer_group.attrs);
> >  	kfree(buffer->scan_el_group.attrs);
> >  	iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
> >  }
> >  
> > +void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
> > +{
> > +	struct iio_buffer *buffer = indio_dev->buffer;
> > +
> > +	if (!buffer)
> > +		return;
> > +
> > +	__iio_buffer_free_sysfs_and_mask(buffer);
> > +}
> > +
> >  static const struct file_operations iio_buffer_fileops = {
> >  	.read = iio_buffer_read_outer,
> >  	.release = iio_buffer_chrdev_release,