linux-kernel - Re: [STABLE][PATCH 4.4] thermal/core/fair share: Lock the thermal zone while looping over instances

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Message-ID: <YKJFhW+ByGl3/zSC@kroah.com>
Date:   Mon, 17 May 2021 12:29:25 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        daniel.lezcano@...aro.org, rui.zhang@...el.com
Subject: Re: [STABLE][PATCH 4.4] thermal/core/fair share: Lock the thermal
 zone while looping over instances

On Fri, May 14, 2021 at 11:58:10AM +0100, Lukasz Luba wrote:
> 
> 
> On 5/14/21 11:56 AM, Greg KH wrote:
> > On Fri, May 14, 2021 at 11:49:16AM +0100, Lukasz Luba wrote:
> > > commit fef05776eb02238dcad8d5514e666a42572c3f32 upstream.
> > > 
> > > The tz->lock must be hold during the looping over the instances in that
> > > thermal zone. This lock was missing in the governor code since the
> > > beginning, so it's hard to point into a particular commit.
> > > 
> > > CC: stable@...r.kernel.org # 4.4
> > > Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> > > ---
> > > Hi all,
> > > 
> > > I've backported my patch which was sent to LKML:
> > > https://lore.kernel.org/linux-pm/20210422153624.6074-2-lukasz.luba@arm.com/
> > > 
> > > The upstream patch failed while applying:
> > > https://lore.kernel.org/stable/16206371483193@kroah.com/
> > > 
> > > This patch should apply to stable v4.4.y, on top of stable tree branch:
> > > linux-4.4.y which head was at:
> > > commit 47127fcd287c ("Linux 4.4.268")
> > 
> > What about 4.9, 4.14, 4.14, and 5.4 releases?  They need this fix as
> > well, right?
> 
> s/4.14/4.19
> 
> Yes, I'm going to send them in next few hours after building and
> testing.

All now queued up, thanks.

greg k-h