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

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Message-ID: <20120807034341.GA2390@kroah.com>
Date:	Mon, 6 Aug 2012 20:43:41 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Bryan Wu <bryan.wu@...onical.com>
Cc:	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	linux-kernel@...r.kernel.org, Richard Purdie <rpurdie@...ys.net>,
	Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH] leds: triggers: send uevent when changing triggers

On Tue, Aug 07, 2012 at 11:38:10AM +0800, Bryan Wu wrote:
> 
> 在 2012-8-7 上午11:34，"Greg KH" <gregkh@...uxfoundation.org>写道：
> >
> > On Tue, Aug 07, 2012 at 10:57:29AM +0800, Bryan Wu wrote:
> > > On Wed, Aug 1, 2012 at 2:28 AM, Colin Cross <ccross@...roid.com> wrote:
> > > > On Thu, Jul 26, 2012 at 9:04 PM, Bryan Wu <bryan.wu@...onical.com> wrote:
> > > >> On Fri, Jul 27, 2012 at 12:51 AM, Greg KH <gregkh@...uxfoundation.org>
> wrote:
> > > >>> On Thu, Jul 26, 2012 at 01:03:11PM +0800, Bryan Wu wrote:
> > > >>>> Just one quick patch for my idea: emitting a uevent in
> sysfs_create_file().
> > > >>>>
> > > >>>> --
> > > >>>> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> > > >>>> index 00012e3..04da869 100644
> > > >>>> --- a/fs/sysfs/file.c
> > > >>>> +++ b/fs/sysfs/file.c
> > > >>>> @@ -570,10 +570,14 @@ int sysfs_add_file(struct sysfs_dirent *dir_sd,
> > > >>>> const struct attribute *attr,
> > > >>>>
> > > >>>>  int sysfs_create_file(struct kobject * kobj, const struct attribute *
> attr)
> > > >>>>  {
> > > >>>> +       int err = 0;
> > > >>>> +
> > > >>>>         BUG_ON(!kobj || !kobj->sd || !attr);
> > > >>>>
> > > >>>> -       return sysfs_add_file(kobj->sd, attr, SYSFS_KOBJ_ATTR);
> > > >>>> +       err = sysfs_add_file(kobj->sd, attr, SYSFS_KOBJ_ATTR);
> > > >>>> +       kobject_uevent(kobj, KOBJ_CHANGE);
> > > >>>
> > > >>> That's a veritable flood of change events when a new kobject is
> created,
> > > >>> right?  It also created uevents for a device that has not told
> userspace
> > > >>> that it is even present, which could cause massive confusion, don't you
> > > >>> think?
> > > >>>
> > > >>
> > > >> Indeed, this is unacceptable. I reworked a new patchset and just sent
> > > >> our for you review.
> > > >>
> > > >> Thanks,
> > > >> -Bryan
> > > >
> > > > Given the rejection of the other solutions to this problem, and chance
> > > > of getting this acked?
> > >
> > > Greg, Richard and Henrique, can I take you guys' Ack here?
> >
> > Ack for what specific patch are you referring to?
> >
> 
> For Colin's patch in the first email of this loop.

I have no idea what that patch contained anymore, that was 1000+ emails
ago...
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