[PATCH 1/2] drm/tegra: don't take dev->struct_mutex in mmap offset ioctl

[Daniel Vetter <daniel.vetter@ffwll.ch>]

Since David Herrmann's mmap vma manager rework we don't need to grab
dev->struct_mutex any more to prevent races when looking up the mmap
offset. Drop it and instead don't forget to use the unref_unlocked
variant (since the drm core still cares).

While at it also fix a leak when this ioctl is called on an imported
buffer.

Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
---
 drivers/gpu/drm/tegra/gem.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 01e16e146bfe..827838e64d6e 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -408,12 +408,9 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 	struct drm_gem_object *gem;
 	struct tegra_bo *bo;
 
-	mutex_lock(&drm->struct_mutex);
-
 	gem = drm_gem_object_lookup(drm, file, handle);
 	if (!gem) {
 		dev_err(drm->dev, "failed to lookup GEM object\n");
-		mutex_unlock(&drm->struct_mutex);
 		return -EINVAL;
 	}
 
@@ -423,8 +420,6 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 
 	drm_gem_object_unreference(gem);
 
-	mutex_unlock(&drm->struct_mutex);
-
 	return 0;
 }
 
-- 
2.1.4

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