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path: root/drivers/rtc/rtc-cmos.c
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-rw-r--r--drivers/rtc/rtc-cmos.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 7030d7cd3861..38aa8e1906c2 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -191,6 +191,13 @@ static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
static int cmos_read_time(struct device *dev, struct rtc_time *t)
{
+ /*
+ * If pm_trace abused the RTC for storage, set the timespec to 0,
+ * which tells the caller that this RTC value is unusable.
+ */
+ if (!pm_trace_rtc_valid())
+ return -EIO;
+
/* REVISIT: if the clock has a "century" register, use
* that instead of the heuristic in mc146818_get_time().
* That'll make Y3K compatility (year > 2070) easy!