[PATCH] drm/exynos: Always initialize mapping in exynos_drm_register_dma()

[Nathan Chancellor]

In certain randconfigs, clang warns:

drivers/gpu/drm/exynos/exynos_drm_dma.c:121:19: warning: variable
'mapping' is uninitialized when used here [-Wuninitialized]
                priv->mapping = mapping;
                                ^~~~~~~
drivers/gpu/drm/exynos/exynos_drm_dma.c:111:16: note: initialize the
variable 'mapping' to silence this warning
                void *mapping;
                             ^
                              = NULL
1 warning generated.

This occurs when CONFIG_EXYNOS_IOMMU is enabled and both
CONFIG_ARM_DMA_USE_IOMMU and CONFIG_IOMMU_DMA are disabled, which makes
the code look like

  void *mapping;

  if (0)
    mapping = arm_iommu_create_mapping()
  else if (0)
    mapping = iommu_get_domain_for_dev()

  ...
  priv->mapping = mapping;

Add an else branch that initializes mapping to the -ENODEV error pointer
so that there is no more warning and the driver does not change during
runtime.

Reported-by: kernel test robot <l...@intel.com>
Signed-off-by: Nathan Chancellor <nat...@kernel.org>
---
 drivers/gpu/drm/exynos/exynos_drm_dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c 
b/drivers/gpu/drm/exynos/exynos_drm_dma.c
index 0644936afee2..bf33c3084cb4 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dma.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c
@@ -115,6 +115,8 @@ int exynos_drm_register_dma(struct drm_device *drm, struct 
device *dev,
                                EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE);
                else if (IS_ENABLED(CONFIG_IOMMU_DMA))
                        mapping = iommu_get_domain_for_dev(priv->dma_dev);
+               else
+                       mapping = ERR_PTR(-ENODEV);
 
                if (IS_ERR(mapping))
                        return PTR_ERR(mapping);

base-commit: 7d549995d4e0d99b68e8a7793a0d23da6fc40fe8
-- 
2.32.0.264.g75ae10bc75