linux-kernel - Re: [PATCH 2/2] HID: roccat: using new sysfs_create_bin

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Date:	Fri, 12 Nov 2010 16:52:32 -0800
From:	Greg KH <gregkh@...e.de>
To:	Eric Biederman <ebiederm@...stanetworks.com>
Cc:	Stefan Achatz <stefan_achatz@....de>,
	"Serge E. Hallyn" <serue@...ibm.com>, Tejun Heo <tj@...nel.org>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Benjamin Thery <benjamin.thery@...l.net>
Subject: Re: [PATCH 2/2] HID: roccat: using new sysfs_create_bin_group() in
 kone driver

On Fri, Nov 12, 2010 at 04:21:45PM -0800, Eric Biederman wrote:
> On Fri, Nov 12, 2010 at 10:18 AM, Stefan Achatz <stefan_achatz@....de> wrote:
> > hid-roccat-kone now uses new group functions for creating binary
> > sysfs attributes.
> 
> Looking at this, I have a problem with the way this works.
> You are still doing this the hard and racy way.
> 
> sysfs attributes that are only added when we initialize the hardware and
> are only removed when we remove the driver should use the device layer
> functions to create their attributes.
> 
> This achieves two things.  The code is easier to write because there
> is less of it.
> The notification to user space happens after the attributes appear so
> that you don't
> have strange hotplug races.
> 
> If there a chance you can look at implementing this in the simpler
> race free way?

Good point, just attach this attribute group to the device and the
driver core will automatically create the files for you.

thanks,

greg k-h
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