add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dma/virt-dma.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Virtual DMA channel support for DMAengine
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  *
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  * Copyright (C) 2012 Russell King
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/device.h>
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 #include <linux/dmaengine.h>
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@@ -83,9 +80,9 @@
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  * This tasklet handles the completion of a DMA descriptor by
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  * calling its callback and freeing it.
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  */
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-static void vchan_complete(unsigned long arg)
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+static void vchan_complete(struct tasklet_struct *t)
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 {
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-	struct virt_dma_chan *vc = (struct virt_dma_chan *)arg;
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+	struct virt_dma_chan *vc = from_tasklet(vc, t, task);
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 	struct virt_dma_desc *vd, *_vd;
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 	struct dmaengine_desc_callback cb;
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 	LIST_HEAD(head);
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@@ -101,15 +98,14 @@
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 	}
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 	spin_unlock_irq(&vc->lock);
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-	dmaengine_desc_callback_invoke(&cb, NULL);
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+	dmaengine_desc_callback_invoke(&cb, &vd->tx_result);
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 	list_for_each_entry_safe(vd, _vd, &head, node) {
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 		dmaengine_desc_get_callback(&vd->tx, &cb);
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 		list_del(&vd->node);
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+		dmaengine_desc_callback_invoke(&cb, &vd->tx_result);
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 		vchan_vdesc_fini(vd);
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-
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-		dmaengine_desc_callback_invoke(&cb, NULL);
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 	}
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 }
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@@ -118,13 +114,8 @@
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 	struct virt_dma_desc *vd, *_vd;
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 	list_for_each_entry_safe(vd, _vd, head, node) {
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-		if (dmaengine_desc_test_reuse(&vd->tx)) {
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-			list_move_tail(&vd->node, &vc->desc_allocated);
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-		} else {
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-			dev_dbg(vc->chan.device->dev, "txd %p: freeing\n", vd);
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-			list_del(&vd->node);
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-			vc->desc_free(vd);
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-		}
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+		list_del(&vd->node);
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+		vchan_vdesc_fini(vd);
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 	}
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 }
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 EXPORT_SYMBOL_GPL(vchan_dma_desc_free_list);
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@@ -138,8 +129,9 @@
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 	INIT_LIST_HEAD(&vc->desc_submitted);
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 	INIT_LIST_HEAD(&vc->desc_issued);
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 	INIT_LIST_HEAD(&vc->desc_completed);
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+	INIT_LIST_HEAD(&vc->desc_terminated);
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-	tasklet_init(&vc->task, vchan_complete, (unsigned long)vc);
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+	tasklet_setup(&vc->task, vchan_complete);
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 	vc->chan.device = dmadev;
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 	list_add_tail(&vc->chan.device_node, &dmadev->channels);