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We can, by virtue of a vblank interrupt firing in the middle of setting up the unpin work (i.e. after we set the unpin_work field and before we write to the ringbuffer) enter intel_finish_page_flip() prior to receiving the pending flip notification. Therefore we can expect to hit intel_finish_page_flip() under normal circumstances without a pending flip and even without installing the pending_flip_obj. This is exacerbated by aperture thrashing whilst binding the framebuffer References: Bug 28079 - "glresize" causes kernel panic in intel_finish_page_flip. https://bugs.freedesktop.org/show_bug.cgi?id=28079 Reported-by: Nick Bowler <nbowler@draconx.ca> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: stable@kernel.org Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net> |
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