linux-kernel - Re: [PATCH] thermal: sun8i: Be loud when probe fails

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Message-ID: <86689f81367716e3f88ec363edd0d302deca0a1f.camel@aosc.io>
Date:   Mon, 20 Jul 2020 15:55:26 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Ondrej Jirman <megous@...ous.com>
Cc:     Amit Kucheria <amit.kucheria@...durent.com>,
        "open list:ALLWINNER THERMAL DRIVER" <linux-pm@...r.kernel.org>,
        Yangtao Li <tiny.windzz@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        linux-sunxi@...glegroups.com, Zhang Rui <rui.zhang@...el.com>,
        Chen-Yu Tsai <wens@...e.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] thermal: sun8i: Be loud when probe fails

在 2020-07-08星期三的 12:03 +0100，Russell King - ARM Linux admin写道：
> On Wed, Jul 08, 2020 at 12:55:27PM +0200, Ondrej Jirman wrote:
> > I noticed several mobile Linux distributions failing to enable the
> > thermal regulation correctly, because the kernel is silent
> > when thermal driver fails to probe. Add enough error reporting
> > to debug issues and warn users in case thermal sensor is failing
> > to probe.
> > 
> > Failing to notify users means, that SoC can easily overheat under
> > load.
> > 
> > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> > ---
> >  drivers/thermal/sun8i_thermal.c | 55 ++++++++++++++++++++++++++---
> > ----
> >  1 file changed, 43 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/thermal/sun8i_thermal.c
> > b/drivers/thermal/sun8i_thermal.c
> > index 74d73be16496..9065e79ae743 100644
> > --- a/drivers/thermal/sun8i_thermal.c
> > +++ b/drivers/thermal/sun8i_thermal.c
> > @@ -287,8 +287,12 @@ static int sun8i_ths_calibrate(struct
> > ths_device *tmdev)
> >  
> >  	calcell = devm_nvmem_cell_get(dev, "calibration");
> >  	if (IS_ERR(calcell)) {
> > +		dev_err(dev, "Failed to get calibration nvmem cell
> > (%ld)\n",
> > +			PTR_ERR(calcell));
> 
> Consider using:
> 
> 		dev_err(dev, "Failed to get calibration nvmem cell
> (%pe)\n",
> 			calcell);
> 
> which means the kernel can print the symbolic errno value.

Oh interesting format here.

When we need to deal with a int return value, is it "%e"?

Thanks

>