xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86: efi: Turn off efi_enabled after setup on mixed fw/kernel

Browse Source 
When 32-bit EFI is used with 64-bit kernel (or vice versa), turn off
efi_enabled once setup is done. Beyond setup, it is normally used to
determine if runtime services are available and we will have none.

This will resolve issues stemming from efivars modprobe panicking on a
32/64-bit setup, as well as some reboot issues on similar setups.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=45991

Reported-by: Marko Kohtala <marko.kohtala@gmail.com>
Reported-by: Maxim Kammerer <mk@dee.su>
Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: stable@kernel.org # 3.4 - 3.6
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Olof Johansson
2012-10-24 10:00:44 -07:00
committed by Matt Fleming
parent 78bef24e84
commit 5189c2a7c7
3 changed files with 23 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/kernel/setup.c
View File

@@ -1035,6 +1035,18 @@ void __init setup_arch(char **cmdline_p)
arch_init_ideal_nops();
register_refined_jiffies(CLOCK_TICK_RATE);
#ifdef CONFIG_EFI
/* Once setup is done above, disable efi_enabled on mismatched
* firmware/kernel archtectures since there is no support for
* runtime services.
*/
if (efi_enabled && IS_ENABLED(CONFIG_X86_64) != efi_64bit) {
pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
efi_unmap_memmap();
efi_enabled = 0;
}
#endif
}
#ifdef CONFIG_X86_32