add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dma/acpi-dma.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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  * ACPI helpers for DMA request / controller
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  *
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@@ -6,13 +7,10 @@
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  * Copyright (C) 2013, Intel Corporation
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  * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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  *	    Mika Westerberg <mika.westerberg@linux.intel.com>
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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/dma-mapping.h>
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 #include <linux/err.h>
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 #include <linux/module.h>
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 #include <linux/kernel.h>
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@@ -89,6 +87,12 @@
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 	if (si->base_request_line == 0 && si->num_handshake_signals == 0)
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 		return 0;
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+	/* Set up DMA mask based on value from CSRT */
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+	ret = dma_coerce_mask_and_coherent(&adev->dev,
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+					   DMA_BIT_MASK(si->dma_address_width));
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+	if (ret)
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+		return 0;
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+
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 	adma->base_request_line = si->base_request_line;
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 	adma->end_request_line = si->base_request_line +
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 				 si->num_handshake_signals - 1;
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@@ -149,7 +153,7 @@
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  * @dev:		struct device of DMA controller
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  * @acpi_dma_xlate:	translation function which converts a dma specifier
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  *			into a dma_chan structure
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- * @data		pointer to controller specific data to be used by
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+ * @data:		pointer to controller specific data to be used by
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  *			translation function
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  *
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  * Allocated memory should be freed with appropriate acpi_dma_controller_free()
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@@ -233,7 +237,7 @@
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  * devm_acpi_dma_controller_register - resource managed acpi_dma_controller_register()
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  * @dev:		device that is registering this DMA controller
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  * @acpi_dma_xlate:	translation function
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- * @data		pointer to controller specific data
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+ * @data:		pointer to controller specific data
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  *
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  * Managed acpi_dma_controller_register(). DMA controller registered by this
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  * function are automatically freed on driver detach. See
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@@ -266,6 +270,7 @@
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 /**
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  * devm_acpi_dma_controller_free - resource managed acpi_dma_controller_free()
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+ * @dev:	device that is unregistering as DMA controller
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  *
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  * Unregister a DMA controller registered with
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  * devm_acpi_dma_controller_register(). Normally this function will not need to
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@@ -359,19 +364,12 @@
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 {
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 	struct acpi_dma_parser_data pdata;
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 	struct acpi_dma_spec *dma_spec = &pdata.dma_spec;
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+	struct acpi_device *adev = ACPI_COMPANION(dev);
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 	struct list_head resource_list;
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-	struct acpi_device *adev;
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 	struct acpi_dma *adma;
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 	struct dma_chan *chan = NULL;
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 	int found;
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-
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-	/* Check if the device was enumerated by ACPI */
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-	if (!dev)
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-		return ERR_PTR(-ENODEV);
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-
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-	adev = ACPI_COMPANION(dev);
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-	if (!adev)
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-		return ERR_PTR(-ENODEV);
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+	int ret;
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 	memset(&pdata, 0, sizeof(pdata));
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 	pdata.index = index;
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@@ -381,9 +379,11 @@
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 	dma_spec->slave_id = -1;
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 	INIT_LIST_HEAD(&resource_list);
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-	acpi_dev_get_resources(adev, &resource_list,
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-			acpi_dma_parse_fixed_dma, &pdata);
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+	ret = acpi_dev_get_resources(adev, &resource_list,
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+				     acpi_dma_parse_fixed_dma, &pdata);
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 	acpi_dev_free_resource_list(&resource_list);
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+	if (ret < 0)
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+		return ERR_PTR(ret);
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 	if (dma_spec->slave_id < 0 || dma_spec->chan_id < 0)
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 		return ERR_PTR(-ENODEV);