linux-kernel - [PATCH 2/2] efi_rtc: probe function error out in case no efi runtime enabled

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Message-ID: <20140806083927.GA31721@dhcp-16-198.nay.redhat.com>
Date:	Wed, 6 Aug 2014 16:39:27 +0800
From:	Dave Young <dyoung@...hat.com>
To:	a.zummo@...ertech.it, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, msalter@...hat.com
Subject: [PATCH 2/2] 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(+)

Index: linux-2.6/drivers/rtc/rtc-efi.c
===================================================================
--- linux-2.6.orig/drivers/rtc/rtc-efi.c
+++ linux-2.6/drivers/rtc/rtc-efi.c
@@ -191,6 +191,9 @@ static int __init efi_rtc_probe(struct p
 {
 	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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