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x86/reboot: Skip DMI checks if reboot set by user

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Skip DMI checks for vendor specific reboot quirks if the user
passed in a reboot= arg on the command line - we should never
override user choices.

Signed-off-by: Michael D Labriola <michael.d.labriola@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Michael D Labriola <mlabriol@gdeb.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/87wr8ab9od.fsf@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Michael D Labriola 2012-01-29 14:17:22 -05:00 committed by Ingo Molnar
parent fc395b9291
commit 5955633e91
1 changed files with 26 additions and 2 deletions
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28
arch/x86/kernel/reboot.c
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@ -39,6 +39,14 @@ static int reboot_mode;
enum reboot_type reboot_type = BOOT_ACPI;
int reboot_force;
/* This variable is used privately to keep track of whether or not
* reboot_type is still set to its default value (i.e., reboot= hasn't
* been set on the command line). This is needed so that we can
* suppress DMI scanning for reboot quirks. Without it, it's
* impossible to override a faulty reboot quirk without recompiling.
*/
static int reboot_default = 1;
#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
static int reboot_cpu = -1;
#endif
@ -67,6 +75,12 @@ bool port_cf9_safe = false;
static int __init reboot_setup(char *str)
{
for (;;) {
/* Having anything passed on the command line via
* reboot= will cause us to disable DMI checking
* below.
*/
reboot_default = 0;
switch (*str) {
case 'w':
reboot_mode = 0x1234;
@ -316,7 +330,12 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
static int __init reboot_init(void)
{
dmi_check_system(reboot_dmi_table);
/* Only do the DMI check if reboot_type hasn't been overridden
* on the command line
*/
if (reboot_default) {
dmi_check_system(reboot_dmi_table);
}
return 0;
}
core_initcall(reboot_init);
@ -465,7 +484,12 @@ static struct dmi_system_id __initdata pci_reboot_dmi_table[] = {
static int __init pci_reboot_init(void)
{
dmi_check_system(pci_reboot_dmi_table);
/* Only do the DMI check if reboot_type hasn't been overridden
* on the command line
*/
if (reboot_default) {
dmi_check_system(pci_reboot_dmi_table);
}
return 0;
}
core_initcall(pci_reboot_init);