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

[Icenowy Zheng]

å 2020-07-08ææäç 12:03 +0100ïRussell King - ARM Linux adminåéï
> 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@xxxxxxxxxx>
> > ---
> >  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

>