Re: [PATCH] OMAP: Dereference of NULL autodep in _autodep_lookup()

[roel kluin <roel.kluin@gmail.com>]

> Thanks for the patch, but I don't understand what problem you're
> pointing out.  If autodeps is NULL entering clkdm_init(), then the
> for-loop won't even be entered.

My first patch was wrong, but there's something I think could
be wrong. In clkdm_init() we have:

for (autodep = autodeps; autodep->pwrdm.ptr; autodep++)
        _autodep_lookup(autodep);

In _autodep_lookup() we ensure that we don't dereference
autodep by:

if (!autodep)
        return;

but if autodep can be NULL we already dereferenced it in
the aforementioned for loop, so shouldn't that be:

for (autodep = autodeps; autodep && autodep->pwrdm.ptr; autodep++)
        _autodep_lookup(autodep);

Then since this is the only call to _autodep_lookup() we can remove
that test there. Do you agree?

> It looks like there may be a problem, however, in _clkdm_add_autodeps()
> and _clkdm_del_autodeps() if no autodeps were passed in.  What do you
> think about something like the following instead?
>
>
> - Paul

Your suggested patch looks right to me as well.