linux-kernel - [PATCH] ACPI: Make sure the FADT is at least rev 2 before using the reset register

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Date:	Fri, 10 Dec 2010 12:57:51 -0500
From:	Matthew Garrett <mjg@...hat.com>
To:	x86@...nel.org
Cc:	hpa@...or.com, linux-acpi@...r.kernel.org, lenb@...nel.org,
	linux-kernel@...r.kernel.org, Matthew Garrett <mjg@...hat.com>
Subject: [PATCH] ACPI: Make sure the FADT is at least rev 2 before using the reset register

The reset register was only introduced with version 2 of the FADT, so we
should check that the FADT revision before trusting its contents.

Signed-off-by: Matthew Garrett <mjg@...hat.com>
---
 drivers/acpi/reboot.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c
index 4870aaa..a6c77e8b 100644
--- a/drivers/acpi/reboot.c
+++ b/drivers/acpi/reboot.c
@@ -15,6 +15,11 @@ void acpi_reboot(void)
 
 	rr = &acpi_gbl_FADT.reset_register;
 
+	/* ACPI reset register was only introduced with v2 of the FADT */
+
+	if (acpi_gbl_FADT.header.revision < 2)
+		return;
+
 	/* Is the reset register supported? The spec says we should be
 	 * checking the bit width and bit offset, but Windows ignores
 	 * these fields */
-- 
1.7.3.2

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