rtc/nuc900: fix checking of args during time-setting

When a user application wants to set the rtc time, the RTC subsystem takes
advantage of 'rtc_valid_tm(tm)' to check 'rtc_time *tm' value validity, it
make sure the 'tm->tm_year' is larger than 70,so if '70< tm_year < 100',
the '(settm->tm_year - 100)' will be negative.  ' Setting the negative
value to hardware register will be invalid, so I add the 'if' condition to
make sure set a valid value to register.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
index 21d13309fb20..20bc70b472fb 100644
--- a/drivers/rtc/rtc-nuc900.c
+++ b/drivers/rtc/rtc-nuc900.c
@@ -116,12 +116,18 @@ static void nuc900_rtc_bcd2bin(unsigned int timereg,
         rtc_valid_tm(tm);
 }
 
-static void nuc900_rtc_bin2bcd(struct rtc_time *settm,
+static void nuc900_rtc_bin2bcd(struct device *dev, struct rtc_time *settm,
                                                 struct nuc900_bcd_time *gettm)
 {
         gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0;
         gettm->bcd_mon  = bin2bcd(settm->tm_mon) << 8;
-        gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;
+
+        if (settm->tm_year < 100) {
+                dev_warn(dev, "The year will be between 1970-1999, right?\n");
+                gettm->bcd_year = bin2bcd(settm->tm_year) << 16;
+        } else {
+                gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;
+        }
 
         gettm->bcd_sec  = bin2bcd(settm->tm_sec) << 0;
         gettm->bcd_min  = bin2bcd(settm->tm_min) << 8;
@@ -176,7 +182,7 @@ static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)
         unsigned long val;
         int *err;
 
-        nuc900_rtc_bin2bcd(tm, &gettm);
+        nuc900_rtc_bin2bcd(dev, tm, &gettm);
 
         err = check_rtc_access_enable(rtc);
         if (IS_ERR(err))
@@ -211,7 +217,7 @@ static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
         unsigned long val;
         int *err;
 
-        nuc900_rtc_bin2bcd(&alrm->time, &tm);
+        nuc900_rtc_bin2bcd(dev, &alrm->time, &tm);
 
         err = check_rtc_access_enable(rtc);
         if (IS_ERR(err))