drm/<drivers>: Unified handling of unimplemented fb->create_handle

Some drivers don't have real ->create_handle callbacks.

- cirrus/ast/mga200: Returns either 0 or -EINVAL.

- udl: Didn't even bother with a callback, leading to a nice
  userspace-triggerable OOPS.

- vmwgfx: This driver bothered with an implementation to return 0 as
  the handle (which is the canonical no-obj gem handle).

All have in common that ->create_handle doesn't really make too much
sense for them - that ioctl is used only for seamless fb takeover in
the radeon/nouveau/i915 ddx drivers. So allow drivers to not implement
this and return a consistent -ENODEV.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

6 files changed, 4 insertions, 38 deletions

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index d5ba7097e5b5..f60fd7bd1183 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -246,16 +246,8 @@ static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb)
         kfree(fb);
 }
 
-static int ast_user_framebuffer_create_handle(struct drm_framebuffer *fb,
-                                              struct drm_file *file,
-                                              unsigned int *handle)
-{
-        return -EINVAL;
-}
-
 static const struct drm_framebuffer_funcs ast_fb_funcs = {
         .destroy = ast_user_framebuffer_destroy,
-        .create_handle = ast_user_framebuffer_create_handle,
 };
 
 
diff --git a/drivers/gpu/drm/cirrus/cirrus_main.c b/drivers/gpu/drm/cirrus/cirrus_main.c
index 364474c66202..35cbae827771 100644
--- a/drivers/gpu/drm/cirrus/cirrus_main.c
+++ b/drivers/gpu/drm/cirrus/cirrus_main.c
@@ -23,16 +23,8 @@ static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
         kfree(fb);
 }
 
-static int cirrus_user_framebuffer_create_handle(struct drm_framebuffer *fb,
-                                                 struct drm_file *file_priv,
-                                                 unsigned int *handle)
-{
-        return 0;
-}
-
 static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
         .destroy = cirrus_user_framebuffer_destroy,
-        .create_handle = cirrus_user_framebuffer_create_handle,
 };
 
 int cirrus_framebuffer_init(struct drm_device *dev,
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 8d665fafc15e..a9abf49bb3ef 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2384,7 +2384,10 @@ int drm_mode_getfb(struct drm_device *dev,
         r->depth = fb->depth;
         r->bpp = fb->bits_per_pixel;
         r->pitch = fb->pitches[0];
-        fb->funcs->create_handle(fb, file_priv, &r->handle);
+        if (fb->funcs->create_handle)
+                ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
+        else
+                ret = -ENODEV;
 
 out:
         mutex_unlock(&dev->mode_config.mutex);
diff --git a/drivers/gpu/drm/mgag200/mgag200_main.c b/drivers/gpu/drm/mgag200/mgag200_main.c
index 266438af61ea..64297c72464f 100644
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -23,16 +23,8 @@ static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
         kfree(fb);
 }
 
-static int mga_user_framebuffer_create_handle(struct drm_framebuffer *fb,
-                                                 struct drm_file *file_priv,
-                                                 unsigned int *handle)
-{
-        return 0;
-}
-
 static const struct drm_framebuffer_funcs mga_fb_funcs = {
         .destroy = mga_user_framebuffer_destroy,
-        .create_handle = mga_user_framebuffer_create_handle,
 };
 
 int mgag200_framebuffer_init(struct drm_device *dev,
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 829c4a76938c..f8904b4e68de 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -422,7 +422,6 @@ static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 static const struct drm_framebuffer_funcs udlfb_funcs = {
         .destroy = udl_user_framebuffer_destroy,
         .dirty = udl_user_framebuffer_dirty,
-        .create_handle = NULL,
 };
 
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index edc97929c9a3..9c0876b908ae 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -373,16 +373,6 @@ void vmw_kms_cursor_post_execbuf(struct vmw_private *dev_priv)
  * Generic framebuffer code
  */
 
-int vmw_framebuffer_create_handle(struct drm_framebuffer *fb,
-                                  struct drm_file *file_priv,
-                                  unsigned int *handle)
-{
-        if (handle)
-                *handle = 0;
-
-        return 0;
-}
-
 /*
  * Surface framebuffer code
  */
@@ -610,7 +600,6 @@ int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
 static struct drm_framebuffer_funcs vmw_framebuffer_surface_funcs = {
         .destroy = vmw_framebuffer_surface_destroy,
         .dirty = vmw_framebuffer_surface_dirty,
-        .create_handle = vmw_framebuffer_create_handle,
 };
 
 static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
@@ -961,7 +950,6 @@ int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
 static struct drm_framebuffer_funcs vmw_framebuffer_dmabuf_funcs = {
         .destroy = vmw_framebuffer_dmabuf_destroy,
         .dirty = vmw_framebuffer_dmabuf_dirty,
-        .create_handle = vmw_framebuffer_create_handle,
 };
 
 /**