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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/firmware/efi/dev-path-parser.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * dev-path-parser.c - EFI Device Path parser
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  * Copyright (C) 2016 Lukas Wunner <lukas@wunner.de>
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@@ -5,14 +6,6 @@
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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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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, see <http://www.gnu.org/licenses/>.
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  */
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10
 
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 #include <linux/acpi.h>
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@@ -24,9 +17,9 @@
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 	char uid[11]; /* UINT_MAX + null byte */
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 };
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19
 
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-static int __init match_acpi_dev(struct device *dev, void *data)
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+static int __init match_acpi_dev(struct device *dev, const void *data)
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 {
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-	struct acpi_hid_uid hid_uid = *(struct acpi_hid_uid *)data;
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+	struct acpi_hid_uid hid_uid = *(const struct acpi_hid_uid *)data;
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 	struct acpi_device *adev = to_acpi_device(dev);
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 	if (acpi_match_device_ids(adev, hid_uid.hid))
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@@ -38,13 +31,13 @@
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 		return !strcmp("0", hid_uid.uid);
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 }
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-static long __init parse_acpi_path(struct efi_dev_path *node,
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+static long __init parse_acpi_path(const struct efi_dev_path *node,
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 				   struct device *parent, struct device **child)
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 {
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 	struct acpi_hid_uid hid_uid = {};
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 	struct device *phys_dev;
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-	if (node->length != 12)
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+	if (node->header.length != 12)
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 		return -EINVAL;
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 	sprintf(hid_uid.hid[0].id, "%c%c%c%04X",
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@@ -76,12 +69,12 @@
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 	return dev_is_pci(dev) && to_pci_dev(dev)->devfn == devfn;
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 }
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-static long __init parse_pci_path(struct efi_dev_path *node,
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+static long __init parse_pci_path(const struct efi_dev_path *node,
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 				  struct device *parent, struct device **child)
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 {
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 	unsigned int devfn;
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-	if (node->length != 6)
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+	if (node->header.length != 6)
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 		return -EINVAL;
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 	if (!parent)
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 		return -EINVAL;
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@@ -112,19 +105,19 @@
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  * search for a device.
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  */
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-static long __init parse_end_path(struct efi_dev_path *node,
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+static long __init parse_end_path(const struct efi_dev_path *node,
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 				  struct device *parent, struct device **child)
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 {
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-	if (node->length != 4)
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+	if (node->header.length != 4)
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 		return -EINVAL;
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-	if (node->sub_type != EFI_DEV_END_INSTANCE &&
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-	    node->sub_type != EFI_DEV_END_ENTIRE)
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+	if (node->header.sub_type != EFI_DEV_END_INSTANCE &&
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+	    node->header.sub_type != EFI_DEV_END_ENTIRE)
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 		return -EINVAL;
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 	if (!parent)
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 		return -ENODEV;
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118
 
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 	*child = get_device(parent);
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-	return node->sub_type;
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+	return node->header.sub_type;
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 }
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 /**
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@@ -163,7 +156,7 @@
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  *	%ERR_PTR(-EINVAL) if a node is malformed or exceeds @len,
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  *	%ERR_PTR(-ENOTSUPP) if support for a node type is not yet implemented.
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  */
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-struct device * __init efi_get_device_by_path(struct efi_dev_path **node,
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+struct device * __init efi_get_device_by_path(const struct efi_dev_path **node,
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 					      size_t *len)
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 {
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 	struct device *parent = NULL, *child;
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@@ -173,16 +166,16 @@
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 		return NULL;
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 	while (!ret) {
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-		if (*len < 4 || *len < (*node)->length)
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+		if (*len < 4 || *len < (*node)->header.length)
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 			ret = -EINVAL;
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-		else if ((*node)->type     == EFI_DEV_ACPI &&
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-			 (*node)->sub_type == EFI_DEV_BASIC_ACPI)
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+		else if ((*node)->header.type		== EFI_DEV_ACPI &&
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+			 (*node)->header.sub_type	== EFI_DEV_BASIC_ACPI)
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 			ret = parse_acpi_path(*node, parent, &child);
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-		else if ((*node)->type     == EFI_DEV_HW &&
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-			 (*node)->sub_type == EFI_DEV_PCI)
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+		else if ((*node)->header.type		== EFI_DEV_HW &&
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+			 (*node)->header.sub_type	== EFI_DEV_PCI)
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 			ret = parse_pci_path(*node, parent, &child);
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-		else if (((*node)->type    == EFI_DEV_END_PATH ||
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-			  (*node)->type    == EFI_DEV_END_PATH2))
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+		else if (((*node)->header.type		== EFI_DEV_END_PATH ||
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+			  (*node)->header.type		== EFI_DEV_END_PATH2))
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 			ret = parse_end_path(*node, parent, &child);
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 		else
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 			ret = -ENOTSUPP;
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@@ -192,8 +185,8 @@
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 			return ERR_PTR(ret);
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 		parent = child;
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-		*node  = (void *)*node + (*node)->length;
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-		*len  -= (*node)->length;
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+		*node  = (void *)*node + (*node)->header.length;
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+		*len  -= (*node)->header.length;
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 	}
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 	if (ret == EFI_DEV_END_ENTIRE)