drm/exynos: Remove empty exynos_drm_gem_prime_{vmap,vunmap}()

The functions exynos_drm_gem_prime_{vmap,vunmap}() are empty. Remove
them before changing the interface to use struct drm_buf_map. As a side
effect of removing drm_gem_prime_vmap(), the error code changes from
ENOMEM to EOPNOTSUPP.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Christian König <christian.koenig@amd.com>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201103093015.1063-5-tzimmermann@suse.de

drivers/gpu/drm/exynos/exynos_drm_gem.c

@@ -135,8 +135,6 @@ static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 static const struct drm_gem_object_funcs exynos_drm_gem_object_funcs = {
 	.free = exynos_drm_gem_free_object,
 	.get_sg_table = exynos_drm_gem_prime_get_sg_table,
-	.vmap = exynos_drm_gem_prime_vmap,
-	.vunmap	= exynos_drm_gem_prime_vunmap,
 	.vm_ops = &exynos_drm_gem_vm_ops,
 };
 
@@ -469,16 +467,6 @@ exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 	return &exynos_gem->base;
 }
 
-void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
-{
-	return NULL;
-}
-
-void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
-{
-	/* Nothing to do */
-}
-
 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
 			      struct vm_area_struct *vma)
 {

drivers/gpu/drm/exynos/exynos_drm_gem.h

@@ -107,8 +107,6 @@ struct drm_gem_object *
 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 				     struct dma_buf_attachment *attach,
 				     struct sg_table *sgt);
-void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj);
-void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
 			      struct vm_area_struct *vma);