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ACPI: Make sure the FADT is at least rev 2 before using the reset register

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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@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Matthew Garrett 2011-03-11 16:12:20 -05:00 committed by Len Brown
parent 6734fe57a0
commit 95cf3e12e7
1 changed files with 5 additions and 0 deletions
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5
drivers/acpi/reboot.c
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@ -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 */