linux-kernel - [tip:x86/urgent] x86/efi: Fix reboot_mode when EFI runtime services are disabled

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Message-ID: <tip-4ecf7191fdcc5686c1eb2b06d7f93ce29d636cf0@git.kernel.org>
Date:   Tue, 25 Jul 2017 06:52:23 -0700
From:   tip-bot for Stefan Assmann <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, tglx@...utronix.de, hpa@...or.com,
        linux-kernel@...r.kernel.org, mingo@...nel.org, sassmann@...nic.de,
        torvalds@...ux-foundation.org
Subject: [tip:x86/urgent] x86/efi: Fix reboot_mode when EFI runtime services
 are disabled

Commit-ID:  4ecf7191fdcc5686c1eb2b06d7f93ce29d636cf0
Gitweb:     http://git.kernel.org/tip/4ecf7191fdcc5686c1eb2b06d7f93ce29d636cf0
Author:     Stefan Assmann <sassmann@...nic.de>
AuthorDate: Mon, 24 Jul 2017 14:22:48 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 25 Jul 2017 11:30:45 +0200

x86/efi: Fix reboot_mode when EFI runtime services are disabled

When EFI runtime services are disabled, for example by the "noefi"
kernel cmdline parameter, the reboot_type could still be set to
BOOT_EFI causing reboot to fail.

Fix this by checking if EFI runtime services are enabled.

Signed-off-by: Stefan Assmann <sassmann@...nic.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20170724122248.24006-1-sassmann@kpanic.de
[ Fixed 'not disabled' double negation. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/reboot.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 67393fc..a56bf60 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -471,12 +471,12 @@ static int __init reboot_init(void)
 
 	/*
 	 * The DMI quirks table takes precedence. If no quirks entry
-	 * matches and the ACPI Hardware Reduced bit is set, force EFI
-	 * reboot.
+	 * matches and the ACPI Hardware Reduced bit is set and EFI
+	 * runtime services are enabled, force EFI reboot.
 	 */
 	rv = dmi_check_system(reboot_dmi_table);
 
-	if (!rv && efi_reboot_required())
+	if (!rv && efi_reboot_required() && !efi_runtime_disabled())
 		reboot_type = BOOT_EFI;
 
 	return 0;