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Subject: Re: Patch "PM / QoS: Fix default runtime_pm device resume latency"
 has been added to the 4.13-stable tree
To: gregkh@linuxfoundation.org
Cc: t-kristo@ti.com, stable@vger.kernel.org,
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From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
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Date: Tue, 7 Nov 2017 01:49:03 +0100
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On 11/5/2017 3:44 PM, gregkh@linuxfoundation.org wrote:
> This is a note to let you know that I've just added the patch titled
>
>      PM / QoS: Fix default runtime_pm device resume latency
>
> to the 4.13-stable tree which can be found at:
>      http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>
> The filename of the patch is:
>       pm-qos-fix-default-runtime_pm-device-resume-latency.patch
> and it can be found in the queue-4.13 subdirectory.
>
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
>
>
>  From 2a9a86d5c81389cd9afe6a4fea42c585733cd705 Mon Sep 17 00:00:00 2001
> From: Tero Kristo <t-kristo@ti.com>
> Date: Mon, 30 Oct 2017 09:10:46 +0200
> Subject: PM / QoS: Fix default runtime_pm device resume latency
>
> From: Tero Kristo <t-kristo@ti.com>
>
> commit 2a9a86d5c81389cd9afe6a4fea42c585733cd705 upstream.
>
> The recent change to the PM QoS framework to introduce a proper
> no constraint value overlooked to handle the devices which don't
> implement PM QoS OPS.  Runtime PM is one of the more severely
> impacted subsystems, failing every attempt to runtime suspend
> a device.  This leads into some nasty second level issues like
> probe failures and increased power consumption among other
> things.
>
> Fix this by adding a proper return value for devices that don't
> implement PM QoS.
>
> Fixes: 0cc2b4e5a020 (PM / QoS: Fix device resume latency PM QoS)
> Signed-off-by: Tero Kristo <t-kristo@ti.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
> ---
>   include/linux/pm_qos.h |    3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> --- a/include/linux/pm_qos.h
> +++ b/include/linux/pm_qos.h
> @@ -175,7 +175,8 @@ static inline s32 dev_pm_qos_requested_f
>   static inline s32 dev_pm_qos_raw_read_value(struct device *dev)
>   {
>   	return IS_ERR_OR_NULL(dev->power.qos) ?
> -		0 : pm_qos_read_value(&dev->power.qos->resume_latency);
> +		PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
> +		pm_qos_read_value(&dev->power.qos->resume_latency);
>   }
>   #else
>   static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
>
>
> Patches currently in stable-queue which might be from t-kristo@ti.com are
>
> queue-4.13/pm-qos-fix-default-runtime_pm-device-resume-latency.patch

Please drop this from the -stable queue, it has been reverted from the 
mainline.

Thanks,

Rafael