This is a note to let you know that I've just added the patch titled
rtc: Disable EFI rtc for x86
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rtc-disable-efi-rtc-for-x86.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 7efe665903d0d963b0ebf4cab25cc3ae32c62600 Mon Sep 17 00:00:00 2001
From: Matt Fleming <[email protected]>
Date: Fri, 3 Oct 2014 13:06:33 +0100
Subject: rtc: Disable EFI rtc for x86
From: Matt Fleming <[email protected]>
commit 7efe665903d0d963b0ebf4cab25cc3ae32c62600 upstream.
commit da167ad7638759 ("rtc: ia64: allow other architectures to use EFI
RTC") inadvertently introduced a regression for x86 because we've been
careful not to enable the EFI rtc driver due to the generally buggy
implementations of the time-related EFI runtime services.
In fact, since the above commit was merged we've seen reports of crashes
on 32-bit tablets,
https://bugzilla.kernel.org/show_bug.cgi?id=84241#c21
Disable it explicitly for x86 so that we don't give users false hope
that this driver will work - it won't, and your machine is likely to
crash.
Acked-by: Mark Salter <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/rtc/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -806,7 +806,7 @@ config RTC_DRV_DA9063
config RTC_DRV_EFI
tristate "EFI RTC"
- depends on EFI
+ depends on EFI && !X86
help
If you say yes here you will get support for the EFI
Real Time Clock.
Patches currently in stable-queue which might be from [email protected] are
queue-3.17/rtc-disable-efi-rtc-for-x86.patch
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