drm/i915: Fix disabled semaphores

The ring will emit too many if semaphores are disabled since we do not
add the correct number to num_dwords anymore.

This was introduced:
commit 52ed23253b68e1cf154b03d91bed619504cf955b
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Mon Dec 16 20:50:38 2013 -0800

    drm/i915: Don't emit mbox updates without semaphores

FWIW, the bug was fixed later in the series.

/me hangs head in shame.

Daniel: Also note that we should have merged the read-only semaphore
modparam before this patch.

Reported-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8fcb32a02cb4..b7f1742caf87 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -673,10 +673,12 @@ gen6_add_request(struct intel_ring_buffer *ring)
         if (ret)
                 return ret;
 
-        for_each_ring(useless, dev_priv, i) {
-                u32 mbox_reg = ring->signal_mbox[i];
-                if (mbox_reg != GEN6_NOSYNC)
-                        update_mboxes(ring, mbox_reg);
+        if (i915_semaphore_is_enabled(dev)) {
+                for_each_ring(useless, dev_priv, i) {
+                        u32 mbox_reg = ring->signal_mbox[i];
+                        if (mbox_reg != GEN6_NOSYNC)
+                                update_mboxes(ring, mbox_reg);
+                }
         }
 
         intel_ring_emit(ring, MI_STORE_DWORD_INDEX);