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

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Message-Id: <1408007953-15151-1-git-send-email-dyoung@redhat.com>
Date:	Thu, 14 Aug 2014 17:19:13 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	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>,
	Mark Salter <msalter@...hat.com>,
	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: [PATCH 7/7] efi_rtc: probe function error out in case no efi runtime enabled

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

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))
-- 
1.8.3.1

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