linux-kernel - [PATCH] x86, reboot: skip DMI checks if reboot set by user

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Message-ID: <OF70B406E9.8D4A6789-ON85257988.0052C104-85257988.0053DE1E@gdeb.com>
Date:	Tue, 17 Jan 2012 10:16:03 -0500
From:	Michael D Labriola <mlabriol@...b.com>
To:	Ingo Molnar <mingo@...e.hu>, Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Michael D Labriola <mlabriol@...b.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Kushal Koolwal <kushalkoolwal@...il.com>,
	linux-kernel@...r.kernel.org, michael.d.labriola@...il.com,
	support@...salogic.com, Thomas Gleixner <tglx@...utronix.de>,
	x86@...nel.org
Subject: [PATCH] x86, reboot: skip DMI checks if reboot set by user

This commit causes DMI checks for vendor specific reboot
quirks to be skipped if the user passed in a reboot= arg
on the command line.

Signed-off-by: Michael D Labriola <mlabriol@...b.com>
---
 arch/x86/kernel/reboot.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 37a458b..4240d58 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -38,6 +38,7 @@ static const struct desc_ptr no_idt = {};
 static int reboot_mode;
 enum reboot_type reboot_type = BOOT_ACPI;
 int reboot_force;
+int reboot_user;
 
 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
 static int reboot_cpu = -1;
@@ -70,10 +71,12 @@ static int __init reboot_setup(char *str)
                switch (*str) {
                case 'w':
                        reboot_mode = 0x1234;
+                       reboot_user = 1;
                        break;
 
                case 'c':
                        reboot_mode = 0;
+                       reboot_user = 1;
                        break;
 
 #ifdef CONFIG_X86_32
@@ -87,6 +90,7 @@ static int __init reboot_setup(char *str)
                                /* we will leave sorting out the final 
value
                                   when we are ready to reboot, since we 
might not
                                   have detected BSP APIC ID or 
smp_num_cpu */
+                       reboot_user = 1;
                        break;
 #endif /* CONFIG_SMP */
 
@@ -98,10 +102,12 @@ static int __init reboot_setup(char *str)
                case 'e':
                case 'p':
                        reboot_type = *str;
+                       reboot_user = 1;
                        break;
 
                case 'f':
                        reboot_force = 1;
+                       reboot_user = 1;
                        break;
                }
 
@@ -316,7 +322,10 @@ static struct dmi_system_id __initdata 
reboot_dmi_table[] = {
 
 static int __init reboot_init(void)
 {
-       dmi_check_system(reboot_dmi_table);
+       /* Skip the DMI check if user set reboot= on the command line */
+       if (!reboot_user) {
+               dmi_check_system(reboot_dmi_table);
+       }
        return 0;
 }
 core_initcall(reboot_init);
@@ -465,7 +474,10 @@ static struct dmi_system_id __initdata 
pci_reboot_dmi_table[] = {
 
 static int __init pci_reboot_init(void)
 {
-       dmi_check_system(pci_reboot_dmi_table);
+       /* Skip the DMI check if user set reboot= on the command line */
+       if (!reboot_user) {
+               dmi_check_system(pci_reboot_dmi_table);
+       }
        return 0;
 }
 core_initcall(pci_reboot_init);
-- 
1.6.0.3




 
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