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samsung-laptop: Disable on EFI hardware

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It has been reported that running this driver on some Samsung laptops
with EFI can cause those machines to become bricked as detailed in the
following report,

	https://bugs.launchpad.net/ubuntu-cdimage/+bug/1040557

There have also been reports of this driver causing Machine Check
Exceptions on recent EFI-enabled Samsung laptops,

	https://bugzilla.kernel.org/show_bug.cgi?id=47121

So disable it if booting from EFI since this driver relies on
grovelling around in the BIOS memory map which isn't going to work.

Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Steve Langasek <steve.langasek@canonical.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Matt Fleming 2013-01-03 09:02:37 +00:00 committed by H. Peter Anvin
parent 83e6818974
commit e0094244e4
1 changed files with 4 additions and 0 deletions
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4
drivers/platform/x86/samsung-laptop.c
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@ -26,6 +26,7 @@
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <acpi/video.h>
/*
@ -1544,6 +1545,9 @@ static int __init samsung_init(void)
struct samsung_laptop *samsung;
int ret;
if (efi_enabled(EFI_BOOT))
return -ENODEV;
quirks = &samsung_unknown;
if (!force && !dmi_check_system(samsung_dmi_table))
return -ENODEV;