On 11/6/2017 10:12 AM, Greg Kroah-Hartman wrote:
> 4.13-stable review patch. If anyone has any objections, please let me know.
Please drop this from the -stable queue, it has been reverted from the
mainline.
Thanks,
Rafael
> ------------------
>
> From: Tero Kristo <[email protected]>
>
> 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 <[email protected]>
> Signed-off-by: Rafael J. Wysocki <[email protected]>
> Signed-off-by: Greg Kroah-Hartman <[email protected]>
>
> ---
> 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,
>
>
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