linux-kernel - Re: [PATCH] staging:comedi: Fixed coding convention issues.

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Date:	Fri, 18 Jun 2010 13:16:43 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Joe Perches <joe@...ches.com>
CC:	Greg KH <greg@...ah.com>,
	Frank Mori Hess <fmhess@...rs.sourceforge.net>,
	Mark Rankilor <reodge@...il.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Henri Häkkinen <henuxd@...il.com>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"andrea.gelmini@...ma.net" <andrea.gelmini@...ma.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging:comedi: Fixed coding convention issues.

On 18/06/10 00:47, Joe Perches wrote:
> On Thu, 2010-06-17 at 16:28 -0700, Greg KH wrote:
>> On Thu, Jun 17, 2010 at 04:15:58PM -0700, Joe Perches wrote:
>>> On Thu, 2010-06-17 at 15:51 -0700, Greg KH wrote:
>>>> On Sat, Jun 12, 2010 at 10:30:50PM -0700, Joe Perches wrote:
>>>>> On Sat, 2010-06-12 at 22:07 -0700, Joe Perches wrote:
>>>>>> 2: Create some comedi logging functions or macros like:
>>>>>>    	comedi_<level>(fmt, arg...) (ie: comedi_info, comedi_err, etc)
>>>>>>    where "comedi:" is always prefixed and an
>>>>>>    optional #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>>>>>>    could be used.
>>>
>>>> I would prefer the conversion of everything over to the dev_printk()
>>>> versions instead of creating a new macro for every individual subsystem.
>>>> That way you get the advantage of logging everything in the common
>>>> format and the dynamic debug functionality as well.
>>>
>>> What I posted has dynamic_debug.
>>>
>>> +#elif defined(CONFIG_DYNAMIC_DEBUG)
>>> +/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
>>> +#define comedi_debug(fmt, ...)                         \
>>> +       dynamic_pr_debug(fmt, ##__VA_ARGS__)
>>>
>>> As far as I know, comedi doesn't always take a struct device *.
>>> I believe it's only used when there's a DMA.
>>
>> No, there's a struct device down in the device almost always.
>>
>>> In struct comedi_device, there are two struct device *'s.
>>>
>>> 	struct device *class_dev;
>>> ...
>>> 	struct device *hw_dev;
>>
>> hw_dev is what we want to use.
> 
> Perhaps Ian or Frank might clarify if
> that's reasonable.  It doesn't look like
> it to me.
> 
> Look at comedi_set_hw_dev.
> See how often it's used?

It's only set by a few drivers currently.  Perhaps it should be set by
comedi_alloc_board_minor() using the 'hardware_device' parameter.
However, in the case of "legacy" comedi devices (the ones not configured
automatically via comedi_auto_config()), that parameter will be NULL.

On a side note, if comedi_alloc_board_minor() were changed to call
comedi_set_hw_dev(), then the driver "_attach" routines could be changed
to check that they really are attaching to the correct hardware device
rather than relying on the struct comedi_devconfig options array values
(which aren't set anyway for auto-configured USB devices).
comedi_set_hw_dev() also ought to return early if the new hw_dev value
is the same as the previous value.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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