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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [BDW Bisected]BUG: unable to handle kernel paging request at ffffc900110a0000"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78274#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [BDW Bisected]BUG: unable to handle kernel paging request at ffffc900110a0000"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78274">bug 78274</a>
from <span class="vcard"><a class="email" href="mailto:ben@bwidawsk.net" title="Ben Widawsky <ben@bwidawsk.net>"> <span class="fn">Ben Widawsky</span></a>
</span></b>
<pre>diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 40a7aa4..62fd8a6 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(ring->dev))
+ return 0;
+
ret = ring->semaphore.signal(ring, 4);
if (ret)
return ret;</pre>
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