Simply forgotten about this when I was doing my general cleansing of
simple gem mmap offset functions. There's nothing but core functions
called here, and they all have their own protection already.

Aside: DRM_ERROR for userspace controlled input isn't great, but
that's for another patch.

v2: Use _unlocked unreference (Daniel Stone).

Cc: Daniel Stone <daniel at fooishbar.org>
Cc: Inki Dae <inki.dae at samsung.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/exynos/exynos_drm_gem.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c 
b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 252eb301470c..44e710ab84de 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -448,8 +448,6 @@ int exynos_drm_gem_dumb_map_offset(struct drm_file 
*file_priv,
        struct drm_gem_object *obj;
        int ret = 0;

-       mutex_lock(&dev->struct_mutex);
-
        /*
         * get offset of memory allocated for drm framebuffer.
         * - this callback would be called by user application
@@ -459,16 +457,13 @@ int exynos_drm_gem_dumb_map_offset(struct drm_file 
*file_priv,
        obj = drm_gem_object_lookup(dev, file_priv, handle);
        if (!obj) {
                DRM_ERROR("failed to lookup gem object.\n");
-               ret = -EINVAL;
-               goto unlock;
+               return -EINVAL;
        }

        *offset = drm_vma_node_offset_addr(&obj->vma_node);
        DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);

-       drm_gem_object_unreference(obj);
-unlock:
-       mutex_unlock(&dev->struct_mutex);
+       drm_gem_object_unreference_unlocked(obj);
        return ret;
 }

-- 
2.5.1

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