netdev - Re: [RFC PATCH] rtl8187: Fix led support for rfkill

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Date:	Mon, 28 Mar 2011 12:40:47 -0300
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Hin-Tak Leung <htl10@...rs.sourceforge.net>,
	wu zhangjin <wuzhangjin@...il.com>,
	Herton Ronaldo Krzesinski <herton@...onical.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Roman Mamedov <rm@...anrm.ru>
Subject: Re: [RFC PATCH] rtl8187: Fix led support for rfkill

On Sun, Mar 27, 2011 at 05:47:36PM -0500, Larry Finger wrote:
> On 03/26/2011 07:55 PM, Hin-Tak Leung wrote:
> >wu zhangjin wrote:
> >>On Sun, Mar 27, 2011 at 5:33 AM, Hin-Tak Leung
> >><htl10@...rs.sourceforge.net> wrote:
> >>>Wu Zhangjin wrote:
> >>>>led can not be turned off normally when rfkill is blocked, the cause is
> >>>>the led_turn_off() function exit as not expected:
> >>>Hmm. While this sounds more sensible, is it needed? And what does the
> >>>windows driver do?
> >>>
> >>>I think there are two kind of LEDs - one that comes on and off with the
> >>>rfkill switch; Larry or Herton makes the 2nd one, if there is one, blink
> >>>while there is traffic (and stay steady on otherwise).
> >>
> >>I have used this driver on the YeeLoong netbook(only support Linux),
> >>there is only one LED for rtl8187, when there is traffic, it blinks
> >>perfectly, but If press the hotkey to turn off the rf, the network
> >>interface is down, but the LED is still light, then, the users may
> >>mistakenly think the hotkey or rfkill support doesn't work or simply
> >>think the interface is still on. So, that's why we may need to fix it.
> >
> >My laptop (a Toshiba one) has the other kind of LED - the LED only comes on and
> >off in relation to the rfkill switch, and does not blink with traffic. I think
> >Herton or Larry has some devices with both types.

I had one via based netbook with proper led, but don't have it anymore.

> >
> >Hmm, I seem to have the impression that there is code somewhere for switching a
> >singular LED's behavior of the driver between one or the other, by echo'ing into
> >sysfs or some other trickery? Or would that be a desired approach if that's not
> >done at the moment?
> 
> My rtl8187 devices are both external USB sticks, thus they have no
> interaction with a radio-kill switch. I will test your patch to make
> sure it does no harm to my system.
> 
> I think the commit message should be revised. A simple statement
> like "the LED does not turn off when the rfkill switch is off"
> should be sufficient.

The patch should work, but I wonder if we should be fiddling with priv->vif
for this, perhaps we should not assume vif to be valid after
rtl8187_remove_interface (I don't see problems with current
rtl8187/mac80211 code on a quick look, but...)

I cleaner solution may be to use a priv->mode like p54.

> 
> Larry
> 

-- 
[]'s
Herton
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