drm/prime: Unexport helpers for fd/handle conversion

Unexport drm_gem_prime_fd_to_handle() and drm_gem_prime_handle_to_fd().
Both are only used internally within the PRIME code.

v2:
* reword docs as functions are now unexported (Simon)

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Simon Ser <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Reviewed-by: Jeffrey Hugo <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_prime.c

···
 }
 EXPORT_SYMBOL(drm_gem_dmabuf_release);
 
-/**
+/*
  * drm_gem_prime_fd_to_handle - PRIME import function for GEM drivers
  * @dev: drm_device to import into
  * @file_priv: drm file-private structure
···
  *
  * Returns 0 on success or a negative error code on failure.
  */
-int drm_gem_prime_fd_to_handle(struct drm_device *dev,
-			       struct drm_file *file_priv, int prime_fd,
-			       uint32_t *handle)
+static int drm_gem_prime_fd_to_handle(struct drm_device *dev,
+				      struct drm_file *file_priv, int prime_fd,
+				      uint32_t *handle)
 {
 	struct dma_buf *dma_buf;
 	struct drm_gem_object *obj;
···
 	dma_buf_put(dma_buf);
 	return ret;
 }
-EXPORT_SYMBOL(drm_gem_prime_fd_to_handle);
 
 int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 				 struct drm_file *file_priv)
···
 	return dmabuf;
 }
 
-/**
+/*
  * drm_gem_prime_handle_to_fd - PRIME export function for GEM drivers
  * @dev: dev to export the buffer from
  * @file_priv: drm file-private structure
···
  * The actual exporting from GEM object to a dma-buf is done through the
  * &drm_gem_object_funcs.export callback.
  */
-int drm_gem_prime_handle_to_fd(struct drm_device *dev,
-			       struct drm_file *file_priv, uint32_t handle,
-			       uint32_t flags,
-			       int *prime_fd)
+static int drm_gem_prime_handle_to_fd(struct drm_device *dev,
+				      struct drm_file *file_priv, uint32_t handle,
+				      uint32_t flags,
+				      int *prime_fd)
 {
 	struct drm_gem_object *obj;
 	int ret = 0;
···
 
 	return ret;
 }
-EXPORT_SYMBOL(drm_gem_prime_handle_to_fd);
 
 int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
 				 struct drm_file *file_priv)
···
  * @obj: GEM object to export
  * @flags: flags like DRM_CLOEXEC and DRM_RDWR
  *
- * This is the implementation of the &drm_gem_object_funcs.export functions for GEM drivers
- * using the PRIME helpers. It is used as the default in
- * drm_gem_prime_handle_to_fd().
+ * This is the implementation of the &drm_gem_object_funcs.export functions
+ * for GEM drivers using the PRIME helpers. It is used as the default for
+ * drivers that do not set their own.
  */
 struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
 				     int flags)
···
  * @dev: drm_device to import into
  * @dma_buf: dma-buf object to import
  *
- * This is the implementation of the gem_prime_import functions for GEM drivers
- * using the PRIME helpers. Drivers can use this as their
- * &drm_driver.gem_prime_import implementation. It is used as the default
- * implementation in drm_gem_prime_fd_to_handle().
+ * This is the implementation of the gem_prime_import functions for GEM
+ * drivers using the PRIME helpers. It is the default for drivers that do
+ * not set their own &drm_driver.gem_prime_import.
  *
  * Drivers must arrange to call drm_prime_gem_destroy() from their
  * &drm_gem_object_funcs.free hook when using this function.

include/drm/drm_prime.h

···
 
 struct drm_device;
 struct drm_gem_object;
-struct drm_file;
 
 /* core prime functions */
 struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
 				      struct dma_buf_export_info *exp_info);
 void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
-
-int drm_gem_prime_fd_to_handle(struct drm_device *dev,
-			       struct drm_file *file_priv, int prime_fd, uint32_t *handle);
-int drm_gem_prime_handle_to_fd(struct drm_device *dev,
-			       struct drm_file *file_priv, uint32_t handle, uint32_t flags,
-			       int *prime_fd);
 
 /* helper functions for exporting */
 int drm_gem_map_attach(struct dma_buf *dma_buf,