add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dma/st_fdma.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * DMA driver for STMicroelectronics STi FDMA controller
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  *
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@@ -5,11 +6,6 @@
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  *
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  * Author: Ludovic Barre <Ludovic.barre@st.com>
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  *	   Peter Griffin <peter.griffin@linaro.org>
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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 as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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  */
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 #include <linux/init.h>
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@@ -19,6 +15,7 @@
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 #include <linux/platform_device.h>
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 #include <linux/interrupt.h>
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 #include <linux/remoteproc.h>
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+#include <linux/slab.h>
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 #include "st_fdma.h"
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21
 
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@@ -243,8 +240,7 @@
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 	struct st_fdma_desc *fdesc;
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 	int i;
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-	fdesc = kzalloc(sizeof(*fdesc) +
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-			sizeof(struct st_fdma_sw_node) * sg_len, GFP_NOWAIT);
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+	fdesc = kzalloc(struct_size(fdesc, node, sg_len), GFP_NOWAIT);
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 	if (!fdesc)
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 		return NULL;
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@@ -293,8 +289,6 @@
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 	struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
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 	struct rproc *rproc = fchan->fdev->slim_rproc->rproc;
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 	unsigned long flags;
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-
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-	LIST_HEAD(head);
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 	dev_dbg(fchan->fdev->dev, "%s: freeing chan:%d\n",
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 		__func__, fchan->vchan.chan.chan_id);
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@@ -626,7 +620,6 @@
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 static int st_fdma_pause(struct dma_chan *chan)
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 {
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 	unsigned long flags;
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-	LIST_HEAD(head);
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 	struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
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 	int ch_id = fchan->vchan.chan.chan_id;
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 	unsigned long cmd = FDMA_CMD_PAUSE(ch_id);
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@@ -779,10 +772,8 @@
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 	platform_set_drvdata(pdev, fdev);
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 	fdev->irq = platform_get_irq(pdev, 0);
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-	if (fdev->irq < 0) {
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-		dev_err(&pdev->dev, "Failed to get irq resource\n");
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+	if (fdev->irq < 0)
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 		return -EINVAL;
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-	}
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 	ret = devm_request_irq(&pdev->dev, fdev->irq, st_fdma_irq_handler, 0,
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 			       dev_name(&pdev->dev), fdev);
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@@ -833,7 +824,7 @@
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 	fdev->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
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 	fdev->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
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-	ret = dma_async_device_register(&fdev->dma_device);
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+	ret = dmaenginem_async_device_register(&fdev->dma_device);
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 	if (ret) {
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 		dev_err(&pdev->dev,
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 			"Failed to register DMA device (%d)\n", ret);
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@@ -844,15 +835,13 @@
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 	if (ret) {
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 		dev_err(&pdev->dev,
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 			"Failed to register controller (%d)\n", ret);
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-		goto err_dma_dev;
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+		goto err_rproc;
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 	}
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 	dev_info(&pdev->dev, "ST FDMA engine driver, irq:%d\n", fdev->irq);
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 	return 0;
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-err_dma_dev:
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-	dma_async_device_unregister(&fdev->dma_device);
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 err_rproc:
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 	st_fdma_free(fdev);
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 	st_slim_rproc_put(fdev->slim_rproc);
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@@ -867,7 +856,6 @@
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 	devm_free_irq(&pdev->dev, fdev->irq, fdev);
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 	st_slim_rproc_put(fdev->slim_rproc);
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 	of_dma_controller_free(pdev->dev.of_node);
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-	dma_async_device_unregister(&fdev->dma_device);
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 	return 0;
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 }