[PATCH 15/29] drm/tegra: Use drm_gem_object_unreference_unlocked

[Daniel Vetter]

This only grabs the mutex when really needed, but still has a
might-acquire lockdep check to make sure that's always possible.
With this patch tegra is officially struct_mutex free, yay!

v2: refernce_unlocked doesn't exist as kbuild spotted.

Cc: Thierry Reding <thierry.reding at gmail.com>
Acked-by: Thierry Reding <thierry.reding at gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/tegra/drm.c | 4 +---
 drivers/gpu/drm/tegra/gem.c | 6 +-----
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 3479c57151af..34d067b677bd 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -277,9 +277,7 @@ host1x_bo_lookup(struct drm_device *drm, struct drm_file *file, u32 handle)
 	if (!gem)
 		return NULL;
 
-	mutex_lock(&drm->struct_mutex);
-	drm_gem_object_unreference(gem);
-	mutex_unlock(&drm->struct_mutex);
+	drm_gem_object_unreference_unlocked(gem);
 
 	bo = to_tegra_bo(gem);
 	return &bo->base;
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index fb712316c522..fbec29516bcb 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -30,9 +30,7 @@ static void tegra_bo_put(struct host1x_bo *bo)
 	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
 	struct drm_device *drm = obj->gem.dev;
 
-	mutex_lock(&drm->struct_mutex);
-	drm_gem_object_unreference(&obj->gem);
-	mutex_unlock(&drm->struct_mutex);
+	drm_gem_object_unreference_unlocked(&obj->gem);
 }
 
 static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
@@ -74,9 +72,7 @@ static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
 	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
 	struct drm_device *drm = obj->gem.dev;
 
-	mutex_lock(&drm->struct_mutex);
 	drm_gem_object_reference(&obj->gem);
-	mutex_unlock(&drm->struct_mutex);
 
 	return bo;
 }
-- 
2.5.1