netdev - Re: [PATCH net] r8169: fix LED-related deadlock on module removal

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Message-ID: <2024041800-yelp-grimy-1819@gregkh>
Date: Thu, 18 Apr 2024 11:55:29 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Lukas Wunner <lukas@...ner.de>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] r8169: fix LED-related deadlock on module removal

On Thu, Apr 18, 2024 at 12:33:00AM +0200, Lukas Wunner wrote:
> On Wed, Apr 17, 2024 at 09:43:27AM +0200, Greg KH wrote:
> > On Wed, Apr 17, 2024 at 09:16:04AM +0200, Heiner Kallweit wrote:
> > > On 17.04.2024 09:04, Greg KH wrote:
> > > > On Wed, Apr 17, 2024 at 08:02:31AM +0200, Heiner Kallweit wrote:
> > > >> On 17.04.2024 04:34, Jakub Kicinski wrote:
> > > >>> On Mon, 15 Apr 2024 13:57:17 +0200 Heiner Kallweit wrote:
> > > >>>> Binding devm_led_classdev_register() to the netdev is problematic
> > > >>>> because on module removal we get a RTNL-related deadlock. Fix this
> > > >>>> by avoiding the device-managed LED functions.
> > > >>>>
> > > >>>> Note: We can safely call led_classdev_unregister() for a LED even
> > > >>>> if registering it failed, because led_classdev_unregister() detects
> > > >>>> this and is a no-op in this case.
> > > >>>>
> > > >>>> Fixes: 18764b883e15 ("r8169: add support for LED's on RTL8168/RTL8101")
> > > >>>> Cc: <stable@...r.kernel.org> # 6.8.x
> > > >>>> Reported-by: Lukas Wunner <lukas@...ner.de>
> > > >>>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> > > >> 
> > > >> This is a version of the fix modified to apply on 6.8.
> > > > 
> > > > That was not obvious at all :(
> > > > 
> > > Stating "Cc: <stable@...r.kernel.org> # 6.8.x" isn't sufficient?
> > 
> > Without showing what commit id this is in Linus's tree, no.
> 
> The upstream commit id *is* called out in the patch, but it's buried
> below the three dashes:
> 
>     The original change was introduced with 6.8, 6.9 added support for
>     LEDs on RTL8125. Therefore the first version of the fix applied on
>     6.9-rc only. This is the modified version for 6.8.
>     Upstream commit: 19fa4f2a85d7
>                      ^^^^^^^^^^^^
> 
> The proper way to do this is to prominently add ...
> 
>     commit 19fa4f2a85d777a8052e869c1b892a2f7556569d upstream.
> 
> ... or ...
> 
>     [ Upstream commit 19fa4f2a85d777a8052e869c1b892a2f7556569d ]
> 
> ... as the first line of the commit message, as per
> Documentation/process/stable-kernel-rules.rst
> 

Yes, Heiner, please resubmit this, AND submit the fix-for-this-fix as
well, so that if we take this patch, it is not broken.

thanks,

greg k-hj