Re: [PATCH 1/2] pinctrl: mvebu: armada-37xx: use use platform api

[Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>]

Hello Fabio,

On Wed, Dec 18, 2019 at 12:09:42PM -0300, Fabio Estevam wrote:
> On Wed, Dec 18, 2019 at 12:00 PM Andrew Lunn <andrew@xxxxxxx> wrote:
> 
> > Hi Fabio
> >
> > Look closer. This is not about returning an error, it is about
> > printing an error.
> >
> > I think the API could better. A %ie formatter would make a lot of
> > sense, so avoiding the ERR_PTR().
> 
> Yes, I think that returning the error like:
> 
> dev_err(dev, "Couldn't determine irq count: %d\n", nr_irq_parent);
> 
> would make the code cleaner.

Are you aware of the semantic difference between

	dev_err(..., "Couldn't determine irq count: %d\n", nr_irq_parent);

and

	dev_err(..., "Couldn't determine irq count: %pe\n", ERR_PTR(nr_irq_parent));

? The first yields:

	Couldn't determine irq count: -5

while the latter yields

	Couldn't determine irq count: -EIO

which is more expressive.

I agree that having a format for printing an integer error code would be
useful. I have this on my todo-list but having some %pe with ERR_PTR
conversion would help me arguing my case.

So I would like the patch to go in with ERR_PTR even though v2 was sent
using %d today.

Best regards
Uwe

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