linux-kernel - [PATCH 05/17] rtc: pcf8523: return meaningful value for RTC_VL

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Message-Id: <20191214220259.621996-6-alexandre.belloni@bootlin.com>
Date:   Sat, 14 Dec 2019 23:02:47 +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 05/17] rtc: pcf8523: return meaningful value for RTC_VL_READ

REG_CONTROL3_BLF indicates the battery is low and needs to be replaced
soon.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-pcf8523.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index b24c908f5f06..47e0f411dd5c 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -282,11 +282,11 @@ static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
 		ret = pcf8523_voltage_low(client);
 		if (ret < 0)
 			return ret;
+		if (ret)
+			ret = RTC_VL_BACKUP_LOW;
 
-		if (copy_to_user((void __user *)arg, &ret, sizeof(int)))
-			return -EFAULT;
+		return put_user(ret, (unsigned int __user *)arg);
 
-		return 0;
 	default:
 		return -ENOIOCTLCMD;
 	}
-- 
2.23.0