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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/gpu/drm/udl/udl_main.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2012 Red Hat
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  *
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@@ -5,13 +6,12 @@
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  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
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  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
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  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
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- *
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- * This file is subject to the terms and conditions of the GNU General Public
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- * License v2. See the file COPYING in the main directory of this archive for
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- * more details.
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9
  */
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-#include <drm/drmP.h>
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-#include <drm/drm_crtc_helper.h>
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+
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+#include <drm/drm.h>
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+#include <drm/drm_print.h>
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+#include <drm/drm_probe_helper.h>
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+
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 #include "udl_drv.h"
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16
 
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 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
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@@ -140,7 +140,6 @@
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 		    urb->status == -ESHUTDOWN)) {
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 			DRM_ERROR("%s - nonzero write bulk status received: %d\n",
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 				__func__, urb->status);
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-			atomic_set(&udl->lost_pixels, 1);
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 		}
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 	}
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@@ -271,7 +270,6 @@
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 	/* Wait for an in-flight buffer to complete and get re-queued */
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 	ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
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 	if (ret) {
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-		atomic_set(&udl->lost_pixels, 1);
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 		DRM_INFO("wait for urb interrupted: %x available: %d\n",
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 		       ret, udl->urbs.available);
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 		goto error;
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@@ -304,7 +302,6 @@
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 	ret = usb_submit_urb(urb, GFP_ATOMIC);
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 	if (ret) {
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 		udl_urb_completion(urb); /* because no one else will */
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-		atomic_set(&udl->lost_pixels, 1);
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 		DRM_ERROR("usb_submit_urb error %x\n", ret);
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 	}
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 	return ret;
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@@ -316,6 +313,10 @@
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 	int ret = -ENOMEM;
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314
 
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 	DRM_DEBUG("\n");
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+
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+	udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
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+	if (!udl->dmadev)
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+		drm_warn(dev, "buffer sharing not supported"); /* not an error */
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 	mutex_init(&udl->gem_lock);
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@@ -338,10 +339,6 @@
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 	if (ret)
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 		goto err;
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-	ret = udl_fbdev_init(dev);
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-	if (ret)
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-		goto err;
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-
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 	drm_kms_helper_poll_init(dev);
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343
 
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 	return 0;
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@@ -349,24 +346,18 @@
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 err:
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 	if (udl->urbs.count)
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 		udl_free_urb_list(dev);
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+	put_device(udl->dmadev);
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 	DRM_ERROR("%d\n", ret);
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 	return ret;
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 }
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353
 
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 int udl_drop_usb(struct drm_device *dev)
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 {
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-	udl_free_urb_list(dev);
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-	return 0;
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-}
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-
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-void udl_fini(struct drm_device *dev)
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-{
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 	struct udl_device *udl = to_udl(dev);
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357
 
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-	drm_kms_helper_poll_fini(dev);
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+	udl_free_urb_list(dev);
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+	put_device(udl->dmadev);
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+	udl->dmadev = NULL;
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-	if (udl->urbs.count)
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-		udl_free_urb_list(dev);
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-
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-	udl_fbdev_cleanup(dev);
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+	return 0;
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363
 }