exynos-drm registration: infinite loop

[Matwey V. Kornilov]

Hi,

I run 3.18-rc3 kernel on BeagleBone Black. It doesn't have Exynos DRM
of course, but I run multi-platform kernel where CONFIG_DRM_EXYNOS is
set to 'y'.
The issue here is that the platform probe/init goes to infinite loop
as the following:

[    5.717343] platform exynos-drm: Driver exynos-drm requests probe deferral
[    5.726848] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully.
[    5.734700] platform exynos-drm: Driver exynos-drm requests probe deferral
[    5.744044] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully.
[    5.752010] platform exynos-drm: Driver exynos-drm requests probe deferral
[    5.761377] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully.
[    5.769291] platform exynos-drm: Driver exynos-drm requests probe deferral

It is quite unexpectable behavior. I would expect that the exynos-drm
failed to initialize with 'no device' error.

See also for the reference: https://bugzilla.kernel.org/show_bug.cgi?id=87691