[PATCH 2/2] drm/fb-helper: improve drm_fb_helper_initial_config locking

[Thierry Reding]

On Thu, Mar 20, 2014 at 02:26:35PM +0100, Daniel Vetter wrote:
[...]
> Hence the right fix is to grab the mode_config mutex, but only that
> and only right around the probe calls.
> 
> It seems to be sufficient to shut up all the locking WARNINGs I see on
> i915 and nouveau in drm_fb_helper_initial_config.

Fixes any of the WARNINGs remaining after patch 1/2 for me on Tegra as
well, so:

Tested-by: Thierry Reding <treding at nvidia.com>
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