linux-kernel - Re: [PATCH 7/7] efi_rtc: probe function error out in case no efi runtime enabled

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Date:	Tue, 23 Sep 2014 15:24:26 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Mark Salter <msalter@...hat.com>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-efi@...r.kernel.org, Daniel Kiper <daniel.kiper@...cle.com>,
	Russ Anderson <rja@....com>, rtc-linux@...glegroups.com
Subject: Re: [PATCH 7/7] efi_rtc: probe function error out in case no efi
 runtime enabled

Hi, Mark

On 09/22/14 at 12:33pm, Mark Salter wrote:
> On Thu, 2014-08-14 at 17:19 +0800, Dave Young wrote:
> > efi rtc depends on efi runtime services, so if efi runtime services are not
> > usable it should error out.
> > 
> > Without this patch rtc-efi will panic with 'noefi' boot
> 
> Is this still needed after commit da167ad7638759:
> 
>   rtc: ia64: allow other architectures to use EFI RTC
> 
> That should keep efi_rtc_probe from being called if runtime services
> are not available.

If that's the case then this patch should be unnecessary, I have no machine
to test it currently though.

> 
> > 
> > Signed-off-by: Dave Young <dyoung@...hat.com>
> > ---
> >  drivers/rtc/rtc-efi.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
> > index c4c3843..ca2487b 100644
> > --- a/drivers/rtc/rtc-efi.c
> > +++ b/drivers/rtc/rtc-efi.c
> > @@ -191,6 +191,9 @@ static int __init efi_rtc_probe(struct platform_device *dev)
> >  {
> >  	struct rtc_device *rtc;
> >  
> > +	if (!efi_enabled(EFI_RUNTIME_SERVICES))
> > +		return -ENODEV;
> > +
> >  	rtc = devm_rtc_device_register(&dev->dev, "rtc-efi", &efi_rtc_ops,
> >  					THIS_MODULE);
> >  	if (IS_ERR(rtc))
> 
> 
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