[PATCH 4/4] drm/udl: Set struct drm_device.dma_dev

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

Set the dma_dev field provided by the DRM device. Required for PRIME
dma-buf import. Remove the driver's implementation.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/gpu/drm/udl/udl_drv.c  | 17 -----------------
 drivers/gpu/drm/udl/udl_drv.h  |  1 -
 drivers/gpu/drm/udl/udl_main.c |  9 ++-------
 3 files changed, 2 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index 05b3a152cc33..3b56ca2f6eb8 100644
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -49,22 +49,6 @@ static int udl_usb_reset_resume(struct usb_interface *interface)
 	return drm_mode_config_helper_resume(dev);
 }
 
-/*
- * FIXME: Dma-buf sharing requires DMA support by the importing device.
- *        This function is a workaround to make USB devices work as well.
- *        See todo.rst for how to fix the issue in the dma-buf framework.
- */
-static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
-							  struct dma_buf *dma_buf)
-{
-	struct udl_device *udl = to_udl(dev);
-
-	if (!udl->dmadev)
-		return ERR_PTR(-ENODEV);
-
-	return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
-}
-
 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
 
 static const struct drm_driver driver = {
@@ -73,7 +57,6 @@ static const struct drm_driver driver = {
 	/* GEM hooks */
 	.fops = &udl_driver_fops,
 	DRM_GEM_SHMEM_DRIVER_OPS,
-	.gem_prime_import = udl_driver_gem_prime_import,
 	DRM_FBDEV_SHMEM_DRIVER_OPS,
 
 	.name = DRIVER_NAME,
diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index be00dc1d87a1..e67e7e2e6f1f 100644
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -51,7 +51,6 @@ struct urb_list {
 struct udl_device {
 	struct drm_device drm;
 	struct device *dev;
-	struct device *dmadev;
 
 	struct drm_plane primary_plane;
 	struct drm_crtc crtc;
diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 3ebe2ce55dfd..45b745241de6 100644
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -311,8 +311,8 @@ int udl_init(struct udl_device *udl)
 
 	DRM_DEBUG("\n");
 
-	udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
-	if (!udl->dmadev)
+	dev->dma_dev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
+	if (!dev->dma_dev)
 		drm_warn(dev, "buffer sharing not supported"); /* not an error */
 
 	mutex_init(&udl->gem_lock);
@@ -343,18 +343,13 @@ int udl_init(struct udl_device *udl)
 err:
 	if (udl->urbs.count)
 		udl_free_urb_list(dev);
-	put_device(udl->dmadev);
 	DRM_ERROR("%d\n", ret);
 	return ret;
 }
 
 int udl_drop_usb(struct drm_device *dev)
 {
-	struct udl_device *udl = to_udl(dev);
-
 	udl_free_urb_list(dev);
-	put_device(udl->dmadev);
-	udl->dmadev = NULL;
 
 	return 0;
 }
-- 
2.48.1