Re: [PATCH v3] i2c: imx: make bus recovery through pinctrl optional

[Uwe Kleine-König]

Hello Li,

On Fri, Jan 15, 2016 at 04:46:06PM +0800, Li Yang wrote:
> On Fri, Jan 15, 2016 at 3:53 PM, Uwe Kleine-König
> <u.kleine-koenig@xxxxxxxxxxxxxx> wrote:
> >> -     i2c_imx_init_recovery_info(i2c_imx, pdev);
> >> +     if (IS_ERR_OR_NULL(i2c_imx->pinctrl))
> >
> > I'd prefer to set i2c_imx->pinctrl to NULL if it's not used and then use
> >
> >         if (!i2c_imx->pinctrl)
> >
> > here. (Or maybe make i2c_imx_init_recovery_info aware of this situation
> > to keep the caller simple?)
> 
> Setting not used pointer to NULL might be a good coding practice
> generally.  But in this case neither the driver nor gpio framework
> checks if the pinctrl is NULL before accessing it.  We still need the
> driver to make sure pinctrl is not used in this situation.  The
> benefit of the proposed change seems to be pretty limited.  :)

At least it gets rid of IS_ERR_OR_NULL which is used wrongly more often
than not.

Best regards
Uwe

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