[Intel-gfx] [PATCH RESEND 14/20] drm/exynos: drop struct_mutex from exynos_gem_map_sgt_with_dma

[Daniel Vetter]

The sg table isn't refcounted, there's no corresponding locking for
unmapping and drm_map_sg is ok with being called concurrently.

So drop the locking since it doesn't protect anything.

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/exynos/exynos_drm_gem.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 91d87e7c2a2f..a3286a1ec2b1 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -378,16 +378,12 @@ int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 {
 	int nents;
 
-	mutex_lock(&drm_dev->struct_mutex);
-
 	nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 	if (!nents) {
 		DRM_ERROR("failed to map sgl with dma.\n");
-		mutex_unlock(&drm_dev->struct_mutex);
 		return nents;
 	}
 
-	mutex_unlock(&drm_dev->struct_mutex);
 	return 0;
 }
 
-- 
2.5.1