linux-kernel - RE: [PATCH] staging: comedi: introduce 'comedi_get

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Date:	Fri, 27 Apr 2012 15:13:05 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"fmhess@...rs.sourceforge.net" <fmhess@...rs.sourceforge.net>,
	"abbotti@....co.uk" <abbotti@....co.uk>
Subject: RE: [PATCH] staging: comedi: introduce 'comedi_get_board' helper
 function

On Friday, April 27, 2012 12:29 PM, Greg KH wrote:
> On Fri, Apr 27, 2012 at 11:49:48AM -0700, H Hartley Sweeten wrote:
>> This helper function is used to fetch the comedi_device board_ptr
>> which is used during the attach to pass board specific information
>> to the comedi drivers.
>> 
>> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
>> Cc: Ian Abbott <abbotti@....co.uk>
>> Cc: Mori Hess <fmhess@...rs.sourceforge.net>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> 
>> ---
>> 
>> With this helper removing all the 'this_board' defines in the drivers
>> will be easier (and cleaner).
>> 
>> diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
>> index 300fd84..53a05dd 100644
>> --- a/drivers/staging/comedi/comedidev.h
>> +++ b/drivers/staging/comedi/comedidev.h
>> @@ -235,6 +235,11 @@ struct comedi_device {
>>  	void (*close) (struct comedi_device *dev);
>>  };
>>  
>> +static inline const void *comedi_get_board(struct comedi_device *dev)
>> +{
>> +	return dev->board_ptr;
>> +}
>
> "traditionally" the *get* functions increment a reference count of the
> pointer it returns, which isn't happening here.

I was trying to model it after dev_get_drvdata. But I see what you mean.

> How about renaming this to just be comedi_board() instead?

Or comedi_board_ptr... Either one works for me but I do like the shorter
name you suggested.

I'll post an updated patch shortly using the comedi_board name.

Regards,
Hartley

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