[Intel-gfx] [PATCH 05/29] drm/i915: prevent NULL pointer exception when using gmbus

Eugeni Dodonov eugeni at dodonov.net
Sat Apr 14 02:26:14 CEST 2012

On Fri, Apr 13, 2012 at 17:18, Chris Wilson <chris at chris-wilson.co.uk>wrote:

> On Fri, 13 Apr 2012 17:08:41 -0300, Eugeni Dodonov <
> eugeni.dodonov at intel.com> wrote:
> > Prevent a NULL pointer exception when we are trying to retrieve EDID data
> > from non-existent adapter.
> This just means that a HDMI with a garbage ddc_bus is never detected.
> Since we control ddc_bus entirely, it means that the initialisation is
> completely bogus. Please fix the root cause and not paper over
> programming bugs.

Sorry, I think I wasn't clear in my cover letter about this one.. I am not
hitting any issue with this current branch I sent; but the nature of the
code we have after the gmbus refactoring made me a bit paranoid about
accessing properties of something that could potential be NULL.

As far as I can see, we should not hit this with any combination of outputs
on any hardware that is already covered by the wikipedia :). So I am fine
with dropping this patch if you also think that it does not adds anything
relevant to us. Or perhaps I should refactor it into adding some WARN's

Eugeni Dodonov
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