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

From: Greg KH
Date: Fri May 14 2021 - 06:56:22 EST


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@xxxxxxxxxxxxxxx # 4.4
> Signed-off-by: Lukasz Luba <lukasz.luba@xxxxxxx>
> ---
> Hi all,
>
> I've backported my patch which was sent to LKML:
> https://lore.kernel.org/linux-pm/20210422153624.6074-2-lukasz.luba@xxxxxxx/
>
> The upstream patch failed while applying:
> https://lore.kernel.org/stable/16206371483193@xxxxxxxxx/
>
> 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?

thanks,

greg k-h