[Intel-gfx] [PATCH v2 2/4] drm/i915: Bump pin_count to 255.

[Maarten Lankhorst]

With nonblocking unpin there can be many cursor pins before they're
cleared by the next page flip.

Fix this by extending pin_count to 255 to prevent a
WARN_ON(vma->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT)

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reported-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Fixes: a6747b7304a9 ("drm/i915: Make unpin async.")
---
 drivers/gpu/drm/i915/i915_gem_gtt.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 62be77cac5cd..bb53c285eef7 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -218,8 +218,8 @@ struct i915_vma {
 	 *
 	 * In the worst case this is 1 + 1 + 1 + 2*2 = 7. That would fit into 3
 	 * bits with absolutely no headroom. So use 4 bits. */
-	unsigned int pin_count:4;
-#define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 0xf
+	unsigned int pin_count;
+#define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 255
 };
 
 struct i915_page_dma {
-- 
2.5.5