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

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Date:	Mon, 22 Sep 2014 12:33:29 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Dave Young <dyoung@...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

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.

> 
> 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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