Re: [PATCH] i2c: mv64xxx: Fix compilation breakage

[Maxime Ripard]

On Fri, Mar 07, 2014 at 04:08:36PM +0000, Russell King - ARM Linux wrote:
> On Fri, Mar 07, 2014 at 03:59:30PM +0100, Maxime Ripard wrote:
> > @@ -900,7 +902,8 @@ mv64xxx_i2c_probe(struct platform_device *pd)
> >  exit_free_irq:
> >  	free_irq(drv_data->irq, drv_data);
> >  exit_reset:
> > -	if (pd->dev.of_node && !IS_ERR(drv_data->rstc))
> > +	if (pd->dev.of_node && IS_ENABLED(CONFIG_RESET_CONTROLLER) &&
> > +	    !IS_ERR(drv_data->rstc))
> >  		reset_control_assert(drv_data->rstc);
> 
> Another question is... why do we need to check pd->dev.of_node here?
> If CONFIG_RESET_CONTROLLER is set, we always try to get the reset
> controller node, so drv_data->rstc is either going to be a valid
> pointer, or it's going to be an error pointer - neither
> reset_control_get() nor devm_reset_control_get return NULL.

Following back on this as I was doing the patch, actually,
drv_data->rstc will be NULL if we're not probed by DT, and hence never
call reset_control_get, that would set an error pointer.

But then, we can use IS_ERR_OR_NULL on drv_data->rstc.

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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