diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 03e3370725179bd14785aef19bf83f5c13c285ee..f6b9baa6a63dec8c0100f8ded5b6b80540d1a5a3 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -928,6 +928,7 @@ static int intel_wrap_ring_buffer(struct intel_ring_buffer *ring) int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n) { + int reread = 0; struct drm_device *dev = ring->dev; struct drm_i915_private *dev_priv = dev->dev_private; unsigned long end; @@ -940,9 +941,8 @@ int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n) * fallback to the slow and accurate path. */ head = intel_read_status_page(ring, 4); - if (head < ring->actual_head) + if (reread) head = I915_READ_HEAD(ring); - ring->actual_head = head; ring->head = head & HEAD_ADDR; ring->space = ring->head - (ring->tail + 8); if (ring->space < 0) @@ -961,6 +961,7 @@ int intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n) msleep(1); if (atomic_read(&dev_priv->mm.wedged)) return -EAGAIN; + reread = 1; } while (!time_after(jiffies, end)); trace_i915_ring_wait_end (dev); return -EBUSY; diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index be9087e4c9beeb4c561ebc474a2b38a6124ce8cd..5b0abfa881fc7964eab452b5ea254e568ea49fe8 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -47,7 +47,6 @@ struct intel_ring_buffer { struct drm_device *dev; struct drm_i915_gem_object *obj; - u32 actual_head; u32 head; u32 tail; int space;