linux-kernel - Re: [PATCH 05/10] thermal: exynos: remove redundant pdata checks from exynos_tmu

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Date:	Mon, 19 May 2014 11:17:28 +0530
From:	Amit Kachhap <amit.kachhap@...il.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	Zhang Rui <rui.zhang@...el.com>,
	Tomasz Figa <t.figa@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/10] thermal: exynos: remove redundant pdata checks from exynos_tmu_initialize()

On 5/15/14, Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com> wrote:
> On Thursday, May 15, 2014 10:47:40 AM Eduardo Valentin wrote:
>> Hello Bartlomiej,
>
> Hi,
>
>> On Mon, May 05, 2014 at 01:15:34PM +0200, Bartlomiej Zolnierkiewicz
>> wrote:
>> > Remove runtime checks for pdata sanity from exynos_tmu_initialize().
>> > The current values hardcoded in pdata will never trigger the checks
>> > and for the new code potential mistakes should be caught during
>> > development/review phases.
>> >
>> > There should be no functional changes caused by this patch.
>> >
>> > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
>> > ---
>> >  drivers/thermal/samsung/exynos_thermal_common.h |  1 -
>> >  drivers/thermal/samsung/exynos_tmu.c            | 13 -------------
>> >  2 files changed, 14 deletions(-)
>> >
>> > diff --git a/drivers/thermal/samsung/exynos_thermal_common.h
>> > b/drivers/thermal/samsung/exynos_thermal_common.h
>> > index 3eb2ed9..cd44719 100644
>> > --- a/drivers/thermal/samsung/exynos_thermal_common.h
>> > +++ b/drivers/thermal/samsung/exynos_thermal_common.h
>> > @@ -27,7 +27,6 @@
>> >  #define SENSOR_NAME_LEN	16
>> >  #define MAX_TRIP_COUNT	8
>> >  #define MAX_COOLING_DEVICE 4
>> > -#define MAX_THRESHOLD_LEVS 5
>> >
>> >  #define ACTIVE_INTERVAL 500
>> >  #define IDLE_INTERVAL 10000
>> > diff --git a/drivers/thermal/samsung/exynos_tmu.c
>> > b/drivers/thermal/samsung/exynos_tmu.c
>> > index 903566f..789d745 100644
>> > --- a/drivers/thermal/samsung/exynos_tmu.c
>> > +++ b/drivers/thermal/samsung/exynos_tmu.c
>> > @@ -158,23 +158,10 @@ static int exynos_tmu_initialize(struct
>> > platform_device *pdev)
>> >  	    data->temp_error > pdata->max_efuse_value)
>> >  		data->temp_error = pdata->efuse_value & EXYNOS_TMU_TEMP_MASK;
>> >
>> > -	if (pdata->max_trigger_level > MAX_THRESHOLD_LEVS) {
>> > -		dev_err(&pdev->dev, "Invalid max trigger level\n");
>> > -		ret = -EINVAL;
>> > -		goto out;
>> > -	}
>> > -
>> >  	for (i = 0; i < pdata->max_trigger_level; i++) {
>> >  		if (!pdata->trigger_levels[i])
>> >  			continue;
>> >
>> > -		if ((pdata->trigger_type[i] == HW_TRIP) &&
>> > -		(!pdata->trigger_levels[pdata->max_trigger_level - 1])) {
>> > -			dev_err(&pdev->dev, "Invalid hw trigger level\n");
>> > -			ret = -EINVAL;
>> > -			goto out;
>> > -		}
>> > -
>>
>> Does it mean no new pdata are going to be written? i.e., no new soc is
>> going to be supported by this driver that needs proper pdata checking?
>
> This is not a proper checking.  The checks in question are done at runtime
> in a production code for data that is hardcoded inside driver during
> development time and later it doesn't change.  Such data should be verified
> during development and review time (i.e. by a script parsing relevant data
> from exynos_tmu_data.c, one can also argue that verification to be done is
> so simple that the review by a maintainer should be enough).
Agreed to your arguments. These changes looks fine.
>
>> >  		/* Count trigger levels except the HW trip*/
>> >  		if (!(pdata->trigger_type[i] == HW_TRIP))
>> >  			trigger_levs++;
>
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
>
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