drm/udl: Improve type safety when using struct udl_device

Push upcasts from struct drm_device to struct udl_device outwards
in the call chain; cast earlier and call functions with the upcasted
value. Improves type safety.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Patrik Jakobsson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/udl/udl_drv.c

···
 			   pm_message_t message)
 {
 	struct drm_device *dev = usb_get_intfdata(interface);
+	struct udl_device *udl = to_udl(dev);
 	int ret;
 
 	ret = drm_mode_config_helper_suspend(dev);
 	if (ret)
 		return ret;
 
-	udl_sync_pending_urbs(dev);
+	udl_sync_pending_urbs(udl);
 	return 0;
 }
 
···
 static void udl_usb_disconnect(struct usb_interface *interface)
 {
 	struct drm_device *dev = usb_get_intfdata(interface);
+	struct udl_device *udl = to_udl(dev);
 
 	drm_dev_unplug(dev);
-	udl_drop_usb(dev);
+	udl_drop_usb(udl);
 }
 
 /*

drivers/gpu/drm/udl/udl_drv.h

···
 }
 
 /* modeset */
-int udl_modeset_init(struct drm_device *dev);
+int udl_modeset_init(struct udl_device *udl);
 struct drm_connector *udl_connector_init(struct drm_device *dev);
 
-struct urb *udl_get_urb(struct drm_device *dev);
+struct urb *udl_get_urb(struct udl_device *udl);
 
-int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len);
-void udl_sync_pending_urbs(struct drm_device *dev);
+int udl_submit_urb(struct udl_device *udl, struct urb *urb, size_t len);
+void udl_sync_pending_urbs(struct udl_device *udl);
 void udl_urb_completion(struct urb *urb);
 
 int udl_init(struct udl_device *udl);
 
-int udl_render_hline(struct drm_device *dev, int log_bpp, struct urb **urb_ptr,
+int udl_render_hline(struct udl_device *udl, int log_bpp, struct urb **urb_ptr,
 		     const char *front, char **urb_buf_ptr,
 		     u32 byte_offset, u32 device_byte_offset, u32 byte_width);
 
-int udl_drop_usb(struct drm_device *dev);
+int udl_drop_usb(struct udl_device *udl);
 int udl_select_std_channel(struct udl_device *udl);
 
 #endif

drivers/gpu/drm/udl/udl_main.c

···
 	wake_up(&udl->urbs.sleep);
 }
 
-static void udl_free_urb_list(struct drm_device *dev)
+static void udl_free_urb_list(struct udl_device *udl)
 {
-	struct udl_device *udl = to_udl(dev);
 	struct urb_node *unode;
 	struct urb *urb;
 
···
 	wake_up_all(&udl->urbs.sleep);
 }
 
-static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
+static int udl_alloc_urb_list(struct udl_device *udl, int count, size_t size)
 {
-	struct udl_device *udl = to_udl(dev);
 	struct urb *urb;
 	struct urb_node *unode;
 	char *buf;
···
 			usb_free_urb(urb);
 			if (size > PAGE_SIZE) {
 				size /= 2;
-				udl_free_urb_list(dev);
+				udl_free_urb_list(udl);
 				goto retry;
 			}
 			break;
···
 }
 
 #define GET_URB_TIMEOUT	HZ
-struct urb *udl_get_urb(struct drm_device *dev)
+struct urb *udl_get_urb(struct udl_device *udl)
 {
-	struct udl_device *udl = to_udl(dev);
 	struct urb *urb;
 
 	spin_lock_irq(&udl->urbs.lock);
···
 	return urb;
 }
 
-int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
+int udl_submit_urb(struct udl_device *udl, struct urb *urb, size_t len)
 {
-	struct udl_device *udl = to_udl(dev);
 	int ret;
 
 	if (WARN_ON(len > udl->urbs.size)) {
···
 }
 
 /* wait until all pending URBs have been processed */
-void udl_sync_pending_urbs(struct drm_device *dev)
+void udl_sync_pending_urbs(struct udl_device *udl)
 {
-	struct udl_device *udl = to_udl(dev);
+	struct drm_device *dev = &udl->drm;
 
 	spin_lock_irq(&udl->urbs.lock);
 	/* 2 seconds as a sane timeout */
···
 	if (udl_select_std_channel(udl))
 		DRM_ERROR("Selecting channel failed\n");
 
-	if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
+	if (!udl_alloc_urb_list(udl, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
 		DRM_ERROR("udl_alloc_urb_list failed\n");
 		goto err;
 	}
 
 	DRM_DEBUG("\n");
-	ret = udl_modeset_init(dev);
+	ret = udl_modeset_init(udl);
 	if (ret)
 		goto err;
 
···
 
 err:
 	if (udl->urbs.count)
-		udl_free_urb_list(dev);
+		udl_free_urb_list(udl);
 	DRM_ERROR("%d\n", ret);
 	return ret;
 }
 
-int udl_drop_usb(struct drm_device *dev)
+int udl_drop_usb(struct udl_device *udl)
 {
-	udl_free_urb_list(dev);
+	udl_free_urb_list(udl);
 
 	return 0;
 }

drivers/gpu/drm/udl/udl_modeset.c

···
 			     const struct drm_rect *clip)
 {
 	struct drm_device *dev = fb->dev;
+	struct udl_device *udl = to_udl(dev);
 	void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */
 	int i, ret;
 	char *cmd;
···
 		return ret;
 	log_bpp = ret;
 
-	urb = udl_get_urb(dev);
+	urb = udl_get_urb(udl);
 	if (!urb)
 		return -ENOMEM;
 	cmd = urb->transfer_buffer;
···
 		const int byte_offset = line_offset + (clip->x1 << log_bpp);
 		const int dev_byte_offset = (fb->width * i + clip->x1) << log_bpp;
 		const int byte_width = drm_rect_width(clip) << log_bpp;
-		ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr,
+		ret = udl_render_hline(udl, log_bpp, &urb, (char *)vaddr,
 				       &cmd, byte_offset, dev_byte_offset,
 				       byte_width);
 		if (ret)
···
 		if (cmd < (char *)urb->transfer_buffer + urb->transfer_buffer_length)
 			*cmd++ = UDL_MSG_BULK;
 		len = cmd - (char *)urb->transfer_buffer;
-		ret = udl_submit_urb(dev, urb, len);
+		ret = udl_submit_urb(udl, urb, len);
 	} else {
 		udl_urb_completion(urb);
 	}
···
 static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state)
 {
 	struct drm_device *dev = crtc->dev;
+	struct udl_device *udl = to_udl(dev);
 	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 	struct drm_display_mode *mode = &crtc_state->mode;
 	struct urb *urb;
···
 	if (!drm_dev_enter(dev, &idx))
 		return;
 
-	urb = udl_get_urb(dev);
+	urb = udl_get_urb(udl);
 	if (!urb)
 		goto out;
 
···
 	buf = udl_vidreg_unlock(buf);
 	buf = udl_dummy_render(buf);
 
-	udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
+	udl_submit_urb(udl, urb, buf - (char *)urb->transfer_buffer);
 
 out:
 	drm_dev_exit(idx);
···
 static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state)
 {
 	struct drm_device *dev = crtc->dev;
+	struct udl_device *udl = to_udl(dev);
 	struct urb *urb;
 	char *buf;
 	int idx;
···
 	if (!drm_dev_enter(dev, &idx))
 		return;
 
-	urb = udl_get_urb(dev);
+	urb = udl_get_urb(udl);
 	if (!urb)
 		goto out;
 
···
 	buf = udl_vidreg_unlock(buf);
 	buf = udl_dummy_render(buf);
 
-	udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer);
+	udl_submit_urb(udl, urb, buf - (char *)urb->transfer_buffer);
 
 out:
 	drm_dev_exit(idx);
···
 	.atomic_commit = drm_atomic_helper_commit,
 };
 
-int udl_modeset_init(struct drm_device *dev)
+int udl_modeset_init(struct udl_device *udl)
 {
-	struct udl_device *udl = to_udl(dev);
+	struct drm_device *dev = &udl->drm;
 	struct drm_plane *primary_plane;
 	struct drm_crtc *crtc;
 	struct drm_encoder *encoder;

drivers/gpu/drm/udl/udl_transfer.c

···
  * (that we can only write to, slowly, and can never read), and (optionally)
  * our shadow copy that tracks what's been sent to that hardware buffer.
  */
-int udl_render_hline(struct drm_device *dev, int log_bpp, struct urb **urb_ptr,
+int udl_render_hline(struct udl_device *udl, int log_bpp, struct urb **urb_ptr,
 		     const char *front, char **urb_buf_ptr,
 		     u32 byte_offset, u32 device_byte_offset,
 		     u32 byte_width)
···
 
 		if (cmd >= cmd_end) {
 			int len = cmd - (u8 *) urb->transfer_buffer;
-			int ret = udl_submit_urb(dev, urb, len);
+			int ret = udl_submit_urb(udl, urb, len);
 			if (ret)
 				return ret;
-			urb = udl_get_urb(dev);
+			urb = udl_get_urb(udl);
 			if (!urb)
 				return -EAGAIN;
 			*urb_ptr = urb;