1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index 8e47e5a06d2a..6273a3d240a2 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -17,7 +17,7 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 
-#define DRV_VERSION "0.1"
+#define DRV_VERSION "0.2"
 
 #define RTC_REG_SIZE            0x800
 #define RTC_OFFSET              0x7f8
@@ -116,7 +116,7 @@ static int ds1742_rtc_read_time(struct device *dev, struct rtc_time *tm)
         return 0;
 }
 
-static struct rtc_class_ops ds1742_rtc_ops = {
+static const struct rtc_class_ops ds1742_rtc_ops = {
         .read_time      = ds1742_rtc_read_time,
         .set_time       = ds1742_rtc_set_time,
 };
@@ -196,7 +196,7 @@ static int __init ds1742_rtc_probe(struct platform_device *pdev)
                 writeb(sec, ioaddr + RTC_SECONDS);
                 writeb(cen & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
         }
-        if (readb(ioaddr + RTC_DAY) & RTC_BATT_FLAG)
+        if (!(readb(ioaddr + RTC_DAY) & RTC_BATT_FLAG))
                 dev_warn(&pdev->dev, "voltage-low detected.\n");
 
         rtc = rtc_device_register(pdev->name, &pdev->dev,
@@ -208,9 +208,13 @@ static int __init ds1742_rtc_probe(struct platform_device *pdev)
         pdata->rtc = rtc;
         pdata->last_jiffies = jiffies;
         platform_set_drvdata(pdev, pdata);
-        sysfs_create_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr);
+        ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1742_nvram_attr);
+        if (ret)
+                goto out;
         return 0;
  out:
+        if (pdata->rtc)
+                rtc_device_unregister(pdata->rtc);
         if (ioaddr)
                 iounmap(ioaddr);
         if (pdata->baseaddr)