virtio-blk: allow toggling host cache between writeback and writethrough

[firefly-linux-kernel-4.4.55.git] / drivers / rtc / interface.c

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index dc87eda6581434c9708173948878e906e46319f6..eb415bd7649418f1d91b5c45b98fe9411f5171d3 100644 (file)
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -458,6 +458,11 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)
        if (rtc->uie_rtctimer.enabled == enabled)
                goto out;
 
+       if (rtc->uie_unsupported) {
+               err = -EINVAL;
+               goto out;
+       }
+
        if (enabled) {
                struct rtc_time tm;
                ktime_t now, onesec;