linux-kernel - Re: [PATCH 1/2] iio: Add no-triggered buffer helper functions

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Date:	Sat, 10 Jan 2015 18:22:11 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Lars-Peter Clausen <lars@...afoo.de>,
	Karol Wrona <k.wrona@...sung.com>, linux-iio@...r.kernel.org,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald <pmeerw@...erw.net>,
	linux-kernel@...r.kernel.org
CC:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Karol Wrona <wrona.vy@...il.com>
Subject: Re: [PATCH 1/2] iio: Add no-triggered buffer helper functions

On 10/01/15 11:10, Lars-Peter Clausen wrote:
> On 01/08/2015 05:40 PM, Karol Wrona wrote:
>> These ones helps to create and manage iio_kfifo buffer when
>> no-triggered buffer is used.
> [...]
>> +int iio_notriggered_buffer_setup(struct iio_dev *indio_dev,
>> +                 const struct iio_buffer_setup_ops *setup_ops)
>> +
>> +{
>> +    int ret;
>> +    struct iio_buffer *buffer;
>> +
>> +    buffer = iio_kfifo_allocate();
>> +    if (!buffer)
>> +        return -ENOMEM;
>> +
>> +    iio_device_attach_buffer(indio_dev, buffer);
>> +
>> +    indio_dev->setup_ops = setup_ops;
>> +
>> +    ret = iio_buffer_register(indio_dev, indio_dev->channels,
>> +                  indio_dev->num_channels);
>> +    if (ret)
>> +        iio_kfifo_free(buffer);
>> +
> 
> We recently got rid of having to manually call iio_buffer_register() and iio_buffer_unregister(). This is now done by the IIO core. See http://git.kernel.org/cgit/linux/kernel/git/jic23/iio.git/commit/?h=togreg&id=3e1b6c95b990c93f4aa3b17e9f66221e2fa44bee
> 
> I don't think we actually need these non-triggered helper functions anymore. It basically just boils down to iio_kfifo_allocate() and iio_device_attach_buffer().
> 
Even if they are still worthwhile, I'd just put them in the core code rather
than having the additional module.  Too trivial for it to make sense
in a utility module.

I'm inclined to agree with Lars that the recent changes reduce the argument for
having these to marginal at best.  Bad luck for crossing with those!

Jonathan

J
> - Lars
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