[Bug 104975] Delay in skl_disable_plane() causes a system freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104975

--- Comment #23 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
The WARN_ON is removed by:

commit fa5aaeecf524ecbcae9755ee3d34b7b8ba412583
Author: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Date:   Tue Jan 30 11:27:04 2018 +0100

    drm/atomic: Remove WARN_ON for invalid plane configuration.

    Userspace can set a FB_ID on a plane without setting CRTC_ID, which
    will fail with -EINVAL, but the kernel shouldn't warn about that.

    Same for !FB_ID and CRTC_ID being set.

This can safely be cherry-picked if needed, but userspace is requesting an
invalid configuration. That bug should be fixed as well.

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