linux-kernel - RE: [PATCH v2] staging: comedi: refactor sysfs files in comedi

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Date:	Thu, 10 May 2012 17:31:36 -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 v2] staging: comedi: refactor sysfs files in
 comedi_fops.c

On Wednesday, May 09, 2012 1:39 PM, Greg KH wrote:
> On Wed, May 09, 2012 at 09:20:08AM -0700, H Hartley Sweeten wrote:
>> Refactor the sysfs attributes and functions to remove
>> the need for the forward declarations and use the
>> DEVICE_ATTR macro to define them.
>> 
>> Instead of individually creating sysfs device attribute
>> files, wrap them in an attribute_group and use the
>> sysfs_create_group function to create them.
>
> This is great, and needed to be done, but you need to take this one step
> further.  This attribute group needs to be registered by the driver
> core, not the comedi core, so userspace doesn't get an add event before
> the files are created.  To do that, assign this attribute group to the
> class and the core will handle it for you.
>
> I've taken this patch, but will you make a follow-on patch that makes
> this change, which will remove this race?  It should be a net removal of
> code in the comedi core overall.
>
I think I worked this out. Compile testing it now and will post the patch
shortly.

Regards,
Hartley

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