linux-kernel - Re: [PATCH 2/6] iio: buffer: Fix kernel docs warnings

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Date:	Sun, 02 Aug 2015 21:46:29 +0200
From:	Hartmut Knaack <knaack.h@....de>
To:	Jonathan Cameron <jic23@...nel.org>,
	Cristina Opriceana <cristina.opriceana@...il.com>
CC:	lars@...afoo.de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, daniel.baluta@...el.com
Subject: Re: [PATCH 2/6] iio: buffer: Fix kernel docs warnings

Hartmut Knaack schrieb am 02.08.2015 um 21:32:
> Jonathan Cameron schrieb am 02.08.2015 um 19:27:
>> On 24/07/15 14:18, Cristina Opriceana wrote:
>>> Fix kernel docs for structures and functions in order to
>>> remove some warnings when the documentation gets generated.
>>>
>>> Signed-off-by: Cristina Opriceana <cristina.opriceana@...il.com>
>> Applied with another typo fixed up.
> 
> Hi,
> I'm afraid there is some information missing.
> 
>>> ---
>>>  drivers/iio/industrialio-buffer.c | 15 ++++++++++++++-
>>>  1 file changed, 14 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
>>> index b13f941..a671953 100644
>>> --- a/drivers/iio/industrialio-buffer.c
>>> +++ b/drivers/iio/industrialio-buffer.c
>>> @@ -91,9 +91,16 @@ static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf,
>>>  
>>>  /**
>>>   * iio_buffer_read_first_n_outer() - chrdev read for buffer access
>>> + * @filp:	File structure pointer for the char device
>>> + * @buf:	Destination buffer for iio buffer read
>>> + * @n:		First n bytes to read
>>> + * @f_ps:	Long offset provided by the user as a seek position
>>>   *
>>>   * This function relies on all buffer implementations having an
>>>   * iio_buffer as their first element.
>>> + *
>>> + * Return: negative values corresponding to error codes or ret != 0
>>> + *	   for ending the reading activity
> 
> This may also return 0. Would it be wrong to state that if the return
> value is not negative, then it will indicate the amount of data read?
> 
>>>   **/
>>>  ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
>>>  				      size_t n, loff_t *f_ps)
>>> @@ -143,6 +150,12 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
>>>  
>>>  /**
>>>   * iio_buffer_poll() - poll the buffer to find out if it has data
>>> + * @filp:	File structure poiner for device access
>> pointer
>>> + * @wait:	Poll table structure pointer for which the driver adds
>>> + *		a wait queue
>>> + *
>>> + * Return: (POLLIN | POLLRDNORM) if data is available for reading
>>> + *	   or 0 for other cases
> 
> This can also return -ENODEV.

On second thought however, it may return anything, given it is unsigned int.
Any volunteers?

> 
>>>   */
>>>  unsigned int iio_buffer_poll(struct file *filp,
>>>  			     struct poll_table_struct *wait)
>>> @@ -1136,7 +1149,7 @@ int iio_scan_mask_query(struct iio_dev *indio_dev,
>>>  EXPORT_SYMBOL_GPL(iio_scan_mask_query);
>>>  
>>>  /**
>>> - * struct iio_demux_table() - table describing demux memcpy ops
>>> + * struct iio_demux_table - table describing demux memcpy ops
>>>   * @from:	index to copy from
>>>   * @to:		index to copy to
>>>   * @length:	how many bytes to copy
>>>
>>
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> 
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