linux-kernel - Re: [PATCH] leds: triggers: send uevent when changing triggers

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Message-ID: <20120726035958.GB7235@kroah.com>
Date:	Wed, 25 Jul 2012 20:59:58 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Bryan Wu <bryan.wu@...onical.com>
Cc:	Colin Cross <ccross@...roid.com>, linux-kernel@...r.kernel.org,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org
Subject: Re: [PATCH] leds: triggers: send uevent when changing triggers

On Thu, Jul 26, 2012 at 11:29:48AM +0800, Bryan Wu wrote:
> On Thu, Jul 26, 2012 at 2:54 AM, Colin Cross <ccross@...roid.com> wrote:
> > On Tue, Jul 24, 2012 at 11:11 PM, Bryan Wu <bryan.wu@...onical.com> wrote:
> >> On Wed, Jul 25, 2012 at 8:32 AM, Colin Cross <ccross@...roid.com> wrote:
> >>> Some triggers create sysfs files when they are enabled.  Send a uevent
> >>> "change" notification whenever the trigger is changed to allow userspace
> >>> processes such as udev to modify permissions on the new files.
> >>>
> >>
> >> This looks like an workaround only for led trigger, can we fix this in
> >> sysfs level?
> >
> > See the previous discussion here: https://lkml.org/lkml/2012/7/20/458
> 
> Thanks, I went through this thread here. Actually it was archived in
> my email account, so I missed that during a trip.
> 
> Basically, I think this issue is a kind of general issue related to
> sysfs, not just only for led trigger system. And adding this uevent
> notification to a upper level LED driver is not good to me, if we got
> similar issue in other subsystem, we should add similar fix there. Why
> not we add this in sysfs when we call device_create_file(). And this
> will be benefit for other drivers.
> 
> Please point out me why we can't do that in sysfs level. Thanks.

Please point out to me how you _can_ do this at a sysfs level :)

greg k-h
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