From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752366Ab3BTX1L (ORCPT ); Wed, 20 Feb 2013 18:27:11 -0500 Received: from terminus.zytor.com ([198.137.202.10]:60016 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751802Ab3BTX1J (ORCPT ); Wed, 20 Feb 2013 18:27:09 -0500 Date: Wed, 20 Feb 2013 15:25:50 -0800 From: tip-bot for Matt Fleming Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, stable@vger.kernel.org, matt.fleming@intel.com, takeuchi_satoru@jp.fujitsu.com, tglx@linutronix.de, hpa@linux.intel.com, walt0924@gmail.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, matt.fleming@intel.com, takeuchi_satoru@jp.fujitsu.com, tglx@linutronix.de, walt0924@gmail.com, hpa@linux.intel.com In-Reply-To: <1361392572-25657-1-git-send-email-matt@console-pimps.org> References: <1361392572-25657-1-git-send-email-matt@console-pimps.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/urgent] x86, efi: Make "noefi" really disable EFI runtime serivces Git-Commit-ID: fb834c7acc5e140cf4f9e86da93a66de8c0514da X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (terminus.zytor.com [127.0.0.1]); Wed, 20 Feb 2013 15:25:56 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: fb834c7acc5e140cf4f9e86da93a66de8c0514da Gitweb: http://git.kernel.org/tip/fb834c7acc5e140cf4f9e86da93a66de8c0514da Author: Matt Fleming AuthorDate: Wed, 20 Feb 2013 20:36:12 +0000 Committer: H. Peter Anvin CommitDate: Wed, 20 Feb 2013 13:18:36 -0800 x86, efi: Make "noefi" really disable EFI runtime serivces commit 1de63d60cd5b ("efi: Clear EFI_RUNTIME_SERVICES rather than EFI_BOOT by "noefi" boot parameter") attempted to make "noefi" true to its documentation and disable EFI runtime services to prevent the bricking bug described in commit e0094244e41c ("samsung-laptop: Disable on EFI hardware"). However, it's not possible to clear EFI_RUNTIME_SERVICES from an early param function because EFI_RUNTIME_SERVICES is set in efi_init() *after* parse_early_param(). This resulted in "noefi" effectively becoming a no-op and no longer providing users with a way to disable EFI, which is bad for those users that have buggy machines. Reported-by: Walt Nelson Jr Cc: Satoru Takeuchi Cc: Signed-off-by: Matt Fleming Link: http://lkml.kernel.org/r/1361392572-25657-1-git-send-email-matt@console-pimps.org Signed-off-by: H. Peter Anvin --- arch/x86/platform/efi/efi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index 928bf83..e2cd38f 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -85,9 +85,10 @@ int efi_enabled(int facility) } EXPORT_SYMBOL(efi_enabled); +static bool disable_runtime = false; static int __init setup_noefi(char *arg) { - clear_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); + disable_runtime = true; return 0; } early_param("noefi", setup_noefi); @@ -734,7 +735,7 @@ void __init efi_init(void) if (!efi_is_native()) pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); else { - if (efi_runtime_init()) + if (disable_runtime || efi_runtime_init()) return; set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); }