rockchip:iommu:fix build error when iommu disabled

diff --git a/include/linux/rockchip/iovmm.h b/include/linux/rockchip/iovmm.h
index 48e212d4dadcd0e5cc15a0f34ada279908e3c17c..d67454fb74dae85507ee8154171e7fe06554bd5d 100755 (executable)
--- a/include/linux/rockchip/iovmm.h
+++ b/include/linux/rockchip/iovmm.h
@@ -68,7 +68,7 @@ struct device *rockchip_get_sysmmu_device_by_compatible(const char *compt);
 #define iovmm_unmap(dev, iova)         do { } while (0)
 #define iovmm_map_oto(dev, phys, size) (-ENOSYS)
 #define iovmm_unmap_oto(dev, phys)     do { } while (0)
-#define rockchip_get_sysmmu_device_by_compatible(compt) do { } while (0)
+#define rockchip_get_sysmmu_device_by_compatible(compt) (NULL)
 
 #endif /* CONFIG_ROCKCHIP_IOVMM */