linux-kernel - [PATCH 11/17] rtc: pcf85063: return meaningful value for RTC_VL

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Message-Id: <20191214220259.621996-12-alexandre.belloni@bootlin.com>
Date:   Sat, 14 Dec 2019 23:02:53 +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 11/17] rtc: pcf85063: return meaningful value for RTC_VL_READ

PCF85063_REG_SC_OS means the voltage dropped too low and data has been
lost.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-pcf85063.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index 2ddd95420a8c..1db17ba1fc64 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -289,15 +289,9 @@ static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
 		if (ret < 0)
 			return ret;
 
-		if (status & PCF85063_REG_SC_OS)
-			dev_warn(&pcf85063->rtc->dev, "Voltage low, data loss detected.\n");
+		status = status & PCF85063_REG_SC_OS ? RTC_VL_DATA_INVALID : 0;
 
-		status &= PCF85063_REG_SC_OS;
-
-		if (copy_to_user((void __user *)arg, &status, sizeof(int)))
-			return -EFAULT;
-
-		return 0;
+		return put_user(status, (unsigned int __user *)arg);
 
 	default:
 		return -ENOIOCTLCMD;
-- 
2.23.0