From f86dc5bde18e540743eaef20529d9f2b67283abd Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Sat, 14 Dec 2019 23:02:53 +0100 Subject: [PATCH] rtc: pcf85063: return meaningful value for RTC_VL_READ PCF85063_REG_SC_OS means the voltage dropped too low and data has been lost. Link: https://lore.kernel.org/r/20191214220259.621996-12-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni --- 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;