linux-kernel - [RFC PATCH 2/2] samsung-laptop: Disable on EFI hardware

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Message-Id: <1357219085-4312-3-git-send-email-matt@console-pimps.org>
Date:	Thu,  3 Jan 2013 13:18:05 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Steve Langasek <steve.langasek@...onical.com>,
	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, Olof Johansson <olof@...om.net>,
	Tony Luck <tony.luck@...el.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Corentin Chary <corentincj@...aif.net>,
	platform-driver-x86@...r.kernel.org
Subject: [RFC PATCH 2/2] samsung-laptop: Disable on EFI hardware

From: Matt Fleming <matt.fleming@...el.com>

There have 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@...aif.net>
Cc: Matthew Garrett <mjg59@...f.ucam.org>
Cc: Steve Langasek <steve.langasek@...onical.com>
Cc: platform-driver-x86@...r.kernel.org
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
---
 drivers/platform/x86/samsung-laptop.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index dd90d15..a94c0ee 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -1534,6 +1534,9 @@ 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;
-- 
1.7.11.7

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