[PATCH] drm/tegra: fix locking of SET_TILING ioctl

From: Alexandre Courbot
Date: Thu Nov 12 2015 - 02:10:26 EST

drm_gem_object_unreference() now expects obj->dev->struct_mutex to be
held. Use the newly-introduced drm_gem_object_unreference_unlocked()
which handles locking for us.

If we don't do this drm_gem_object_unreference() will get noisy about
struct_mutex not being held every time we call the SET_TILING ioctl.

Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
drivers/gpu/drm/tegra/drm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index cc48334ef164..c0ae89865958 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -683,7 +683,7 @@ static int tegra_gem_set_tiling(struct drm_device *drm, void *data,
bo->tiling.mode = mode;
bo->tiling.value = value;

- drm_gem_object_unreference(gem);
+ drm_gem_object_unreference_unlocked(gem);

return 0;

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