| From 7efe665903d0d963b0ebf4cab25cc3ae32c62600 Mon Sep 17 00:00:00 2001 |
| From: Matt Fleming <matt.fleming@intel.com> |
| Date: Fri, 3 Oct 2014 13:06:33 +0100 |
| Subject: rtc: Disable EFI rtc for x86 |
| |
| From: Matt Fleming <matt.fleming@intel.com> |
| |
| 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 <msalter@redhat.com> |
| Cc: Dave Young <dyoung@redhat.com> |
| Cc: Alessandro Zummo <a.zummo@towertech.it> |
| Signed-off-by: Matt Fleming <matt.fleming@intel.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| 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. |
