[Bug 100610] WARNING: CPU: 1 PID: 16615 at drivers/gpu/drm/drm_debugfs_crc.c:185 crtc_crc_open+0x1d0/0x1f0 [drm]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100610

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Introduced by commit e8fa5671183c80342d520ad81d14fa79a9d4a680
Author: Tomeu Vizoso <tomeu.vizoso at collabora.com>
Date:   Mon Jan 2 13:59:10 2017 +0100

    drm: crc: Wait for a frame before returning from open()

    Don't return from the open() call on the crc/data file until the HW has
    produced a first frame, as there's great variability in when the HW is
    able to do that and userspace shouldn't have to guess when this specific
    HW is ready to start giving frame CRCs.

    Signed-off-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Link:
http://patchwork.freedesktop.org/patch/msgid/20170102125912.22305-3-tomeu.vizoso@collabora.com

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