[Intel-gfx] [PATCH] drm/i915: fix deadlock in fb teardown

[Jesse Barnes]

At module unload time we'll tear down the fbdev state.  We do so under
the struct mutex, so we shouldn't try to use the unlocked variant of
the GEM object unreference function or we may deadlock.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
index c3c5052..866ad05 100644
--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/drivers/gpu/drm/i915/intel_fb.c
@@ -236,7 +236,7 @@ int intel_fbdev_destroy(struct drm_device *dev,
 
 	drm_framebuffer_cleanup(&ifb->base);
 	if (ifb->obj)
-		drm_gem_object_unreference_unlocked(ifb->obj);
+		drm_gem_object_unreference(ifb->obj);
 
 	return 0;
 }