Fix an oops in i915_gem_retire_requests()

dev_priv->hw_status_page can be NULL, if i915_gem_retire_requests()
is called from i915_gem_busy_ioctl().

Signed-off-by Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 25b3374..28b726d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1051,6 +1051,9 @@ i915_gem_retire_requests(struct drm_device *dev)
        drm_i915_private_t *dev_priv = dev->dev_private;
        uint32_t seqno;
 
+       if (!dev_priv->hw_status_page)
+               return;
+
        seqno = i915_get_gem_seqno(dev);
 
        while (!list_empty(&dev_priv->mm.request_list)) {