linux-kernel - Re: [PATCH 1/3] sysfs: introduce a sysfs_create_file

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Date:	Sat, 28 Jul 2012 23:18:35 +0800
From:	Bryan Wu <bryan.wu@...onical.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	ccross@...roid.com, hmh@....eng.br, rpurdie@...ys.net,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH 1/3] sysfs: introduce a sysfs_create_file_uevent new API

On Fri, Jul 27, 2012 at 11:52 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Fri, Jul 27, 2012 at 12:02:41PM +0800, Bryan Wu wrote:
>> Send a uevent notification whenever a new sysfs file is created to allow
>> userspace processes such as udev to modify permissions on the new files.
>
> This makes no sense, why not just call kobject_uevent after creating the
> file when needed?  Wrapping it up in a single function call doesn't add
> any benefit that I can see, can you?
>

I actually just want to make it benefit for further similar issue in
other subsystem, although I got this point from the email started by
Colin Cross. I agree if it is just specific to LED subsystem, we'd
better add this fixing in LED trigger core code. Maybe I worried about
too much and if you guys all ack Colin's patch, I'm going to apply it.

Thanks,
-Bryan

>>
>> This new API function helps to do this.
>>
>> Signed-off-by: Bryan Wu <bryan.wu@...onical.com>
>> ---
>>  fs/sysfs/file.c       | 28 ++++++++++++++++++++++++++++
>>  include/linux/sysfs.h | 13 +++++++++++++
>>  2 files changed, 41 insertions(+)
>>
>> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
>> index 00012e3..5a22d13 100644
>> --- a/fs/sysfs/file.c
>> +++ b/fs/sysfs/file.c
>> @@ -576,6 +576,34 @@ int sysfs_create_file(struct kobject * kobj, const struct attribute * attr)
>>
>>  }
>>
>> +/**
>> + *   sysfs_create_file_uevent - create an attribute file for an object
>> +                                     and send a uevent to userspace.
>
> kerneldoc needs to be on one line for function names, right?
>
> greg k-h



-- 
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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