Re: [PATCH] PM / OPP: of_property_count_u32_elems() can return errors

[Stephen Boyd <sboyd@codeaurora.org>]

On 09/18, Viresh Kumar wrote:
> On 17-09-15, 11:13, Stephen Boyd wrote:
> > > +	count = of_property_count_u32_elems(opp->np, "opp-microvolt");
> > > +	if (count < 0) {
> > 
> > We can't test count for -EINVAL to detect the missing property
> > because -EINVAL is also returned on a non-multiple of u32 length
> > property? Maybe we shouldn't worry about that case and turn
> > -EINVAL into 0.
> 
> So you are saying that we go ahead without regulators if a incorrect
> values are present in opp-microvolt? i.e. even if the length property
> was invalid, we return 0 from this function.
> 
> The problem here is that we will try changing the frequency without
> changing the regulator in that case, and it might not be safe for the
> platform, isn't it?
> 

Do we care if a platform has changed the length of the property
to something that isn't a multiple of u32? That sounds very rare,
that's all. I agree it's a bug.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project