drm: Some ocd in drm_file.c

Move the open helper around to avoid the forward decl, and give
drm_setup a drm_legacy_ prefix since it's all legacy stuff in there.

v2: Move drm_legacy_setup into drm_legacy_misc.c (Chris). The
counterpart in the form of drm_legacy_dev_reinit is there already too,
plus it fits perfectly into Dave's work of making DRIVER_LEGACY code
compile-time optional.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190502135603.20413-1-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_file.c

@@ -100,8 +100,6 @@ DEFINE_MUTEX(drm_global_mutex);
  * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
  */
 
-static int drm_open_helper(struct file *filp, struct drm_minor *minor);
-
 /**
  * drm_file_alloc - allocate file context
  * @minor: minor to allocate on
@@ -273,76 +271,6 @@ static void drm_close_helper(struct file *filp)
 	drm_file_free(file_priv);
 }
 
-static int drm_setup(struct drm_device * dev)
-{
-	int ret;
-
-	if (dev->driver->firstopen &&
-	    drm_core_check_feature(dev, DRIVER_LEGACY)) {
-		ret = dev->driver->firstopen(dev);
-		if (ret != 0)
-			return ret;
-	}
-
-	ret = drm_legacy_dma_setup(dev);
-	if (ret < 0)
-		return ret;
-
-
-	DRM_DEBUG("\n");
-	return 0;
-}
-
-/**
- * drm_open - open method for DRM file
- * @inode: device inode
- * @filp: file pointer.
- *
- * This function must be used by drivers as their &file_operations.open method.
- * It looks up the correct DRM device and instantiates all the per-file
- * resources for it. It also calls the &drm_driver.open driver callback.
- *
- * RETURNS:
- *
- * 0 on success or negative errno value on falure.
- */
-int drm_open(struct inode *inode, struct file *filp)
-{
-	struct drm_device *dev;
-	struct drm_minor *minor;
-	int retcode;
-	int need_setup = 0;
-
-	minor = drm_minor_acquire(iminor(inode));
-	if (IS_ERR(minor))
-		return PTR_ERR(minor);
-
-	dev = minor->dev;
-	if (!dev->open_count++)
-		need_setup = 1;
-
-	/* share address_space across all char-devs of a single device */
-	filp->f_mapping = dev->anon_inode->i_mapping;
-
-	retcode = drm_open_helper(filp, minor);
-	if (retcode)
-		goto err_undo;
-	if (need_setup) {
-		retcode = drm_setup(dev);
-		if (retcode) {
-			drm_close_helper(filp);
-			goto err_undo;
-		}
-	}
-	return 0;
-
-err_undo:
-	dev->open_count--;
-	drm_minor_release(minor);
-	return retcode;
-}
-EXPORT_SYMBOL(drm_open);
-
 /*
  * Check whether DRI will run on this CPU.
  *
@@ -424,6 +352,56 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 	return 0;
 }
 
+/**
+ * drm_open - open method for DRM file
+ * @inode: device inode
+ * @filp: file pointer.
+ *
+ * This function must be used by drivers as their &file_operations.open method.
+ * It looks up the correct DRM device and instantiates all the per-file
+ * resources for it. It also calls the &drm_driver.open driver callback.
+ *
+ * RETURNS:
+ *
+ * 0 on success or negative errno value on falure.
+ */
+int drm_open(struct inode *inode, struct file *filp)
+{
+	struct drm_device *dev;
+	struct drm_minor *minor;
+	int retcode;
+	int need_setup = 0;
+
+	minor = drm_minor_acquire(iminor(inode));
+	if (IS_ERR(minor))
+		return PTR_ERR(minor);
+
+	dev = minor->dev;
+	if (!dev->open_count++)
+		need_setup = 1;
+
+	/* share address_space across all char-devs of a single device */
+	filp->f_mapping = dev->anon_inode->i_mapping;
+
+	retcode = drm_open_helper(filp, minor);
+	if (retcode)
+		goto err_undo;
+	if (need_setup) {
+		retcode = drm_legacy_setup(dev);
+		if (retcode) {
+			drm_close_helper(filp);
+			goto err_undo;
+		}
+	}
+	return 0;
+
+err_undo:
+	dev->open_count--;
+	drm_minor_release(minor);
+	return retcode;
+}
+EXPORT_SYMBOL(drm_open);
+
 void drm_lastclose(struct drm_device * dev)
 {
 	DRM_DEBUG("\n");

drivers/gpu/drm/drm_legacy.h

@@ -187,10 +187,12 @@ int drm_legacy_sg_free(struct drm_device *dev, void *data,
 void drm_legacy_init_members(struct drm_device *dev);
 void drm_legacy_destroy_members(struct drm_device *dev);
 void drm_legacy_dev_reinit(struct drm_device *dev);
+int drm_legacy_setup(struct drm_device * dev);
 #else
 static inline void drm_legacy_init_members(struct drm_device *dev) {}
 static inline void drm_legacy_destroy_members(struct drm_device *dev) {}
 static inline void drm_legacy_dev_reinit(struct drm_device *dev) {}
+static inline int drm_legacy_setup(struct drm_device * dev) { return 0; }
 #endif
 
 #if IS_ENABLED(CONFIG_DRM_LEGACY)

drivers/gpu/drm/drm_legacy_misc.c

@@ -51,6 +51,26 @@ void drm_legacy_destroy_members(struct drm_device *dev)
 	mutex_destroy(&dev->ctxlist_mutex);
 }
 
+int drm_legacy_setup(struct drm_device * dev)
+{
+	int ret;
+
+	if (dev->driver->firstopen &&
+	    drm_core_check_feature(dev, DRIVER_LEGACY)) {
+		ret = dev->driver->firstopen(dev);
+		if (ret != 0)
+			return ret;
+	}
+
+	ret = drm_legacy_dma_setup(dev);
+	if (ret < 0)
+		return ret;
+
+
+	DRM_DEBUG("\n");
+	return 0;
+}
+
 void drm_legacy_dev_reinit(struct drm_device *dev)
 {
 	if (dev->irq_enabled)