Merge tag 'xfs-rmap-for-linus-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-block.git] / drivers / rtc / rtc-efi.c

diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
index 96d38609d803a90bd4beeea4395949a273c12e9b..0130afd7fe889e5767660292c2d2f87d58ad2725 100644 (file)
--- a/drivers/rtc/rtc-efi.c
+++ b/drivers/rtc/rtc-efi.c
@@ -259,6 +259,12 @@ static const struct rtc_class_ops efi_rtc_ops = {
 static int __init efi_rtc_probe(struct platform_device *dev)
 {
        struct rtc_device *rtc;
+       efi_time_t eft;
+       efi_time_cap_t cap;
+
+       /* First check if the RTC is usable */
+       if (efi.get_time(&eft, &cap) != EFI_SUCCESS)
+               return -ENODEV;
 
        rtc = devm_rtc_device_register(&dev->dev, "rtc-efi", &efi_rtc_ops,
                                        THIS_MODULE);