linux-kernel - [PATCH 5/5] efi_rtc: probe function error out in case no efi runtime enabled

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Message-Id: <1407823822-23829-5-git-send-email-dyoung@redhat.com>
Date:	Tue, 12 Aug 2014 14:10:22 +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, rtc-linux@...glegroups.com
Subject: [PATCH 5/5] 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 8225b89..8c02ed8 100644
--- a/drivers/rtc/rtc-efi.c
+++ b/drivers/rtc/rtc-efi.c
@@ -213,6 +213,9 @@ 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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