change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/firmware/efi/efi-bgrt.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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  * Copyright 2012 Intel Corporation
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  * Author: Josh Triplett <josh@joshtriplett.org>
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@@ -5,10 +6,6 @@
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  * Based on the bgrt driver:
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  * Copyright 2012 Red Hat, Inc <mjg@redhat.com>
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  * Author: Matthew Garrett
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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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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -45,7 +42,12 @@
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 		return;
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 	}
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 	*bgrt = *(struct acpi_table_bgrt *)table;
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-	if (bgrt->version != 1) {
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+	/*
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+	 * Only version 1 is defined but some older laptops (seen on Lenovo
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+	 * Ivy Bridge models) have a correct version 1 BGRT table with the
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+	 * version set to 0, so we accept version 0 and 1.
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+	 */
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+	if (bgrt->version > 1) {
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 		pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
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 		       bgrt->version);
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 		goto out;