drm/i915: fix up ring cleanup for the i830/i845 CS tlb w/a

It's not a good idea to also run the pipe_control cleanup.

This regression has been introduced whith the original cs tlb w/a in

commit b45305fce5bb1abec263fcff9d81ebecd6306ede
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon Dec 17 16:21:27 2012 +0100

    drm/i915: Implement workaround for broken CS tlb on i830/845

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64610
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 18ca76e3e5ef..664118d8c1d6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -534,9 +534,6 @@ cleanup_pipe_control(struct intel_ring_buffer *ring)
         struct pipe_control *pc = ring->private;
         struct drm_i915_gem_object *obj;
 
-        if (!ring->private)
-                return;
-
         obj = pc->obj;
 
         kunmap(sg_page(obj->pages->sgl));
@@ -544,7 +541,6 @@ cleanup_pipe_control(struct intel_ring_buffer *ring)
         drm_gem_object_unreference(&obj->base);
 
         kfree(pc);
-        ring->private = NULL;
 }
 
 static int init_render_ring(struct intel_ring_buffer *ring)
@@ -617,7 +613,10 @@ static void render_ring_cleanup(struct intel_ring_buffer *ring)
         if (HAS_BROKEN_CS_TLB(dev))
                 drm_gem_object_unreference(to_gem_object(ring->private));
 
-        cleanup_pipe_control(ring);
+        if (INTEL_INFO(dev)->gen >= 5)
+                cleanup_pipe_control(ring);
+
+        ring->private = NULL;
 }
 
 static void