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authorWan ZongShun <mcuos.com@gmail.com>2010-08-11 05:02:07 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 19:59:06 +0400
commit70d2a0bae26c7c44641785d9def8a0d9048abbea (patch)
tree01c89101b519340ff6252eb2de5024d016c20789 /drivers/rtc/rtc-nuc900.c
parent0a89b55364e0a4fd4be9bc2c9a697f9b027eb395 (diff)
downloadlinux-70d2a0bae26c7c44641785d9def8a0d9048abbea.tar.xz
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>
Diffstat (limited to 'drivers/rtc/rtc-nuc900.c')
-rw-r--r--drivers/rtc/rtc-nuc900.c14
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))