From 5955633e91bfc5cd0a41d8d82259e1d8b32980ef Mon Sep 17 00:00:00 2001 From: Michael D Labriola Date: Sun, 29 Jan 2012 14:17:22 -0500 Subject: x86/reboot: Skip DMI checks if reboot set by user 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 Cc: Alan Cox Cc: Michael D Labriola Cc: Matthew Garrett Cc: Linus Torvalds Link: http://lkml.kernel.org/r/87wr8ab9od.fsf@gmail.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/reboot.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) (limited to 'arch/x86/kernel/reboot.c') diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 37a458b521a6..b257f0e28824 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -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); -- cgit v1.2.2 From e6d36a653becc7bbc643c399a77882e02bf552cb Mon Sep 17 00:00:00 2001 From: Michael D Labriola Date: Sun, 29 Jan 2012 14:21:17 -0500 Subject: x86/reboot: Remove VersaLogic Menlow reboot quirk This commit removes the reboot quirk originally added by commit e19e074 ("x86: Fix reboot problem on VersaLogic Menlow boards"). Testing with a VersaLogic Ocelot (VL-EPMs-21a rev 1.00 w/ BIOS 6.5.102) revealed the following regarding the reboot hang problem: - v2.6.37 reboot=bios was needed. - v2.6.38-rc1: behavior changed, reboot=acpi is needed, reboot=kbd and reboot=bios results in system hang. - v2.6.38: VersaLogic patch (e19e074 "x86: Fix reboot problem on VersaLogic Menlow boards") was applied prior to v2.6.38-rc7. This patch sets a quirk for VersaLogic Menlow boards that forces the use of reboot=bios, which doesn't work anymore. - v3.2: It seems that commit 660e34c ("x86: Reorder reboot method preferences") changed the default reboot method to acpi prior to v3.0-rc1, which means the default behavior is appropriate for the Ocelot. No VersaLogic quirk is required. The Ocelot board used for testing can successfully reboot w/out having to pass any reboot= arguments for all 3 current versions of the BIOS. Signed-off-by: Michael D Labriola Cc: Matthew Garrett Cc: Michael D Labriola Cc: Kushal Koolwal Cc: Linus Torvalds Link: http://lkml.kernel.org/r/87vcnub9hu.fsf@gmail.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/reboot.c | 8 -------- 1 file changed, 8 deletions(-) (limited to 'arch/x86/kernel/reboot.c') diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index b257f0e28824..d840e69a853c 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -309,14 +309,6 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = { DMI_MATCH(DMI_BOARD_NAME, "P4S800"), }, }, - { /* Handle problems with rebooting on VersaLogic Menlow boards */ - .callback = set_bios_reboot, - .ident = "VersaLogic Menlow based board", - .matches = { - DMI_MATCH(DMI_BOARD_VENDOR, "VersaLogic Corporation"), - DMI_MATCH(DMI_BOARD_NAME, "VersaLogic Menlow board"), - }, - }, { /* Handle reboot issue on Acer Aspire one */ .callback = set_kbd_reboot, .ident = "Acer Aspire One A110", -- cgit v1.2.2