@@ -84,9 +84,10 @@ 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);
@@ -733,7 +734,7 @@ 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);
}
This is a note to let you know that I have just added a patch titled x86, efi: Make "noefi" really disable EFI runtime serivces to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 7d93f57ac8dce73252987a0ec2c786163667208c Mon Sep 17 00:00:00 2001 From: Matt Fleming <matt.fleming@intel.com> Date: Wed, 20 Feb 2013 20:36:12 +0000 Subject: [PATCH] x86, efi: Make "noefi" really disable EFI runtime serivces commit fb834c7acc5e140cf4f9e86da93a66de8c0514da upstream. 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 <walt0924@gmail.com> Cc: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Link: http://lkml.kernel.org/r/1361392572-25657-1-git-send-email-matt@console-pimps.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- arch/x86/platform/efi/efi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) -- 1.8.1.2