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rtc: Disable EFI rtc for x86

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commit da167ad763 ("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>
Cc: <stable@vger.kernel.org> # v3.17
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Matt Fleming 2014-10-03 13:06:33 +01:00
parent 3f71f6da77
commit 7efe665903
1 changed files with 1 additions and 1 deletions
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2
drivers/rtc/Kconfig
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@ -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.