tree 5caf15b1d46697bda2201fd1625d498e64df9f01
parent ac619f4eba45da10053fc991f8a5d47b3be79fa3
author Jan Beulich <JBeulich@novell.com> 1311072787 +0100
committer Ingo Molnar <mingo@elte.hu> 1311232860 +0200

x86: Serialize EFI time accesses on rtc_lock

The EFI specification requires that callers of the time related
runtime functions serialize with other CMOS accesses in the
kernel, as the EFI time functions may choose to also use the
legacy CMOS RTC.

Besides fixing a latent bug, this is a prerequisite to safely
enable the rtc-efi driver for x86, which ought to be preferred
over rtc-cmos on all EFI platforms.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: <mjg@redhat.com>
Link: http://lkml.kernel.org/r/4E257E33020000780004E319@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Matthew Garrett <mjg@redhat.com>