linux-kernel - Re: [RFT][PATCH v2 2/2] PM / QoS: Fix device resume latency framework

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Date:   Fri, 3 Nov 2017 09:39:08 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Tero Kristo <t-kristo@...com>,
        Ramesh Thomas <ramesh.thomas@...el.com>,
        Alex Shi <alex.shi@...aro.org>
Subject: Re: [RFT][PATCH v2 2/2] PM / QoS: Fix device resume latency framework

Hi Rafael,

I started to test this but found myself triggering one of the warnings:

On 11/3/2017 4:50 AM, Rafael J. Wysocki wrote:
> --- linux-pm.orig/include/linux/pm_qos.h
> +++ linux-pm/include/linux/pm_qos.h
> @@ -28,16 +28,19 @@ enum pm_qos_flags_status {
>  	PM_QOS_FLAGS_ALL,
>  };
>  
> -#define PM_QOS_DEFAULT_VALUE -1
> +#define PM_QOS_DEFAULT_VALUE	(-1)

PM_QOS_DEFAULT_VALUE is -1 ...


> ===================================================================
> --- linux-pm.orig/drivers/base/power/qos.c
> +++ linux-pm/drivers/base/power/qos.c
> @@ -139,6 +139,9 @@ static int apply_constraint(struct dev_p
>  
>  	switch(req->type) {
>  	case DEV_PM_QOS_RESUME_LATENCY:
> +		if (WARN_ON(value < 0))
> +			value = 0;
> +

... causing me to hit this WARN_ON because apply_constraint() is called by __dev_pm_qos_remove_request() with the value parameter set to PM_QOS_DEFAULT_VALUE.

Reinette