linux-kernel - [PATCH 6/7] rtc: rx8581: error out when time invalid

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Date:   Thu, 17 May 2018 22:33:30 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     linux-rtc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 6/7] rtc: rx8581: error out when time invalid

Return an error when the date is unreliable because the battery is low.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-rx8581.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/rtc-rx8581.c b/drivers/rtc/rtc-rx8581.c
index 0a70f1ac5cc2..53644bb271af 100644
--- a/drivers/rtc/rtc-rx8581.c
+++ b/drivers/rtc/rtc-rx8581.c
@@ -109,6 +109,12 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
 		return -EIO;
 	}
 
+	if (data & RX8581_FLAG_VLF) {
+		dev_warn(dev,
+			"low voltage detected, date/time is not reliable.\n");
+		return -EINVAL;
+	}
+
 	do {
 		/* If update flag set, clear it */
 		if (data & RX8581_FLAG_UF) {
@@ -136,10 +142,6 @@ static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm)
 		}
 	} while (data & RX8581_FLAG_UF);
 
-	if (data & RX8581_FLAG_VLF)
-		dev_info(dev,
-			"low voltage detected, date/time is not reliable.\n");
-
 	dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, "
 		"wday=%02x, mday=%02x, mon=%02x, year=%02x\n",
 		__func__,
-- 
2.17.0