[Bug 78274] [BDW Bisected]BUG: unable to handle kernel paging request at ffffc900110a0000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78274

--- Comment #6 from Ben Widawsky <ben at bwidawsk.net> ---
Please test this while I think more:
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 40a7aa4..1371bf6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -717,6 +717,9 @@ gen6_add_request(struct intel_ring_buffer *ring)
 {
        int ret;

+       if (!i915_semaphore_is_enabled(dev))
+               return 0;
+
        ret = ring->semaphore.signal(ring, 4);
        if (ret)
                return ret;

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