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x86, reboot: Only use CF9_COND automatically, not CF9

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Only CF9_COND is appropriate for inclusion in the default chain, not
CF9; the latter will poke that register unconditionally, whereas
CF9_COND will at least look for PCI configuration method #1 or #2
first (a weak check, but better than nothing.)

CF9 should be used for explicit system configuration (command line or
DMI) only.

Cc: Aubrey Li <aubrey.li@intel.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Link: http://lkml.kernel.org/r/53130A46.1010801@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2014-03-05 15:41:15 -08:00
parent a4f1987e4c
commit fb3bd7b19b
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/reboot.c
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@ -535,7 +535,7 @@ static void native_machine_emergency_restart(void)
EFI_RESET_WARM :
EFI_RESET_COLD,
EFI_SUCCESS, 0, NULL);
reboot_type = BOOT_CF9;
reboot_type = BOOT_CF9_COND;
break;
case BOOT_CF9: