linux-kernel - [PATCH 17/17] rtc: rx8010: return meaningful value for RTC_VL

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Message-Id: <20191214220259.621996-18-alexandre.belloni@bootlin.com>
Date:   Sat, 14 Dec 2019 23:02:59 +0100
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 17/17] rtc: rx8010: return meaningful value for RTC_VL_READ

RX8010_FLAG_VLF means the voltage dropped too low and data has been lost.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-rx8010.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/rtc/rtc-rx8010.c b/drivers/rtc/rtc-rx8010.c
index 9b106a26c64b..4021844bf2fa 100644
--- a/drivers/rtc/rtc-rx8010.c
+++ b/drivers/rtc/rtc-rx8010.c
@@ -399,11 +399,8 @@ static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 		if (flagreg < 0)
 			return flagreg;
 
-		tmp = !!(flagreg & RX8010_FLAG_VLF);
-		if (copy_to_user((void __user *)arg, &tmp, sizeof(int)))
-			return -EFAULT;
-
-		return 0;
+		tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
+		return put_user(tmp, (unsigned int __user *)arg);
 
 	default:
 		return -ENOIOCTLCMD;
-- 
2.23.0