[PATCH] drivers/rtc/interface.c: check the error after __rtc_read_time()

[Hyogi Gim]

In __rtc_set_alarm(), the error after __rtc_read_time() is not checked.
If rtc device fail to read time, we cannot guarantee the following process.

Add the verification code for returned __rtc_read_time() error.

Signed-off-by: Hyogi Gim <hyogi.gim@xxxxxxx>
---
 drivers/rtc/interface.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 5813fa5..5b2717f 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -348,6 +348,8 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 
 	/* Make sure we're not setting alarms in the past */
 	err = __rtc_read_time(rtc, &tm);
+	if (err)
+		return err;
 	rtc_tm_to_time(&tm, &now);
 	if (scheduled <= now)
 		return -ETIME;
-- 
1.8.3.2

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