[rtc-linux] Re: [PATCH] x86/hpet: fix typo from rtc cleanup

[Jarkko Nikula <jarkko.nikula@linux.intel.com>]

Hi

On 08/09/2016 10:54 PM, Arnd Bergmann wrote:
> Ville Syrj=C3=A4l=C3=A4 reports "The first time I run hwclock after reboo=
ting
> I get this:
>
>  open("/dev/rtc", O_RDONLY)              =3D 3
>  ioctl(3, PHN_SET_REGS or RTC_UIE_ON, 0) =3D 0
>  select(4, [3], NULL, NULL, {10, 0})     =3D 0 (Timeout)
>  ioctl(3, PHN_NOT_OH or RTC_UIE_OFF, 0)  =3D 0
>  close(3)                                =3D 0
>
> On all subsequent runs I get this:
>  open("/dev/rtc", O_RDONLY)              =3D 3
>  ioctl(3, PHN_SET_REGS or RTC_UIE_ON, 0) =3D -1 EINVAL (Invalid argument)
>  ioctl(3, RTC_RD_TIME, 0x7ffd76b3ae70)   =3D -1 EINVAL (Invalid argument)
>  close(3)                                =3D 0"
>
> This was caused by a stupid typo in a patch that should have been
> a simple rename to move around contents of a header file, but
> accidentally wrote zeroes into the rtc rather than reading from
> it.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Reported-by: Ville Syrj=C3=A4l=C3=A4 <ville.syrjala@linux.intel.com>
> Tested-by: Ville Syrj=C3=A4l=C3=A4 <ville.syrjala@linux.intel.com>
> Fixes: 463a86304cae ("char/genrtc: x86: remove remnants of asm/rtc.h")
> ---
>  arch/x86/kernel/hpet.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
I started seeing system reboots and lockups during kernel boot on a=20
prototype HW this week using v4.8-rc1 and bisected to this same commit.

This patch fixes the issue.

Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>

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