linux-kernel - Re: [PATCH] staging: comedi: cleanup all the comedi

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Date:	Sat, 19 May 2012 07:42:12 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"fmhess@...rs.sourceforge.net" <fmhess@...rs.sourceforge.net>,
	Ian Abbott <ian.abbott@....co.uk>
Subject: Re: [PATCH] staging: comedi: cleanup all the comedi_driver 'detach'
 functions

On 19/05/12 01:32, Greg KH wrote:
> On Thu, May 17, 2012 at 05:11:14PM -0700, H Hartley Sweeten wrote:
>> All of the printk output is really just noise. The user did a rmmod to
>> unload the driver, we really don't need to tell them about it.
>>
>> Also, some of the messages are output using:
>>
>> 	dev_dbg(dev->hw_dev, ...
>> or
>> 	dev_info(dev->hw_dev, ...
>>
>> Unfortunately the hw_dev value is only used by drivers that are doing
>> DMA. For most drivers this variable is going to be NULL so the output
>> is not going to work as expected.

They don't crash and still produce kernel logs, but replaces the device 
class and device name in the log entry with "(NULL device *)" or 
something like that.

> Sorry about that, I probably caused a lot of that.  As no one ever
> complained, odds are no one is using those drivers :)

Most of them seem to have from Ravishankar Karkala Mallikarjunayya.

-- 
-=( 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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