drm/i915: fix possible NULL dereference of dev_priv

Dereference dev_priv only after we know it is valid.
Found with smatch.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a48e4910ea2c..4ea331b931fd 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1045,7 +1045,7 @@ static int i915_set_status_page(struct drm_device *dev, void *data,
 {
         drm_i915_private_t *dev_priv = dev->dev_private;
         drm_i915_hws_addr_t *hws = data;
-        struct intel_ring_buffer *ring = LP_RING(dev_priv);
+        struct intel_ring_buffer *ring;
 
         if (drm_core_check_feature(dev, DRIVER_MODESET))
                 return -ENODEV;
@@ -1065,6 +1065,7 @@ static int i915_set_status_page(struct drm_device *dev, void *data,
 
         DRM_DEBUG_DRIVER("set status page addr 0x%08x\n", (u32)hws->addr);
 
+        ring = LP_RING(dev_priv);
         ring->status_page.gfx_addr = hws->addr & (0x1ffff<<12);
 
         dev_priv->dri1.gfx_hws_cpu_addr =