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

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Message-ID: <CAK5ve-KvdokobzjmuXSsEZxrJcr7i4xHOXJGvMqCSOZ69G_5zw@mail.gmail.com>
Date:	Tue, 7 Aug 2012 10:57:29 +0800
From:	Bryan Wu <bryan.wu@...onical.com>
To:	Colin Cross <ccross@...roid.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>, 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 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?

Thanks,
-- 
Bryan Wu <bryan.wu@...onical.com>
Kernel Developer    +86.186-168-78255 Mobile
Canonical Ltd.      www.canonical.com
Ubuntu - Linux for human beings | www.ubuntu.com
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