Currently the rtc_class_op's set_mmss() function takes a 32bit second
value (on 32bit systems), which is problematic for dates past y2038.
This patch provides a safe version named set_mmss64() using y2038 safe
time64_t.
After this patch, set_mmss() is deprecated and all its users will be
fixed to use set_mmss64(), it can be removed when having no users.
Signed-off-by: Xunlei Pang <pang.xun...@linaro.org>
---
drivers/rtc/interface.c | 7 ++++++-
drivers/rtc/systohc.c | 5 ++++-
include/linux/rtc.h | 1 +
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 45bfc28ee..db44df8 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -72,7 +72,10 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
err = -ENODEV;
else if (rtc->ops->set_time)
err = rtc->ops->set_time(rtc->dev.parent, tm);
- else if (rtc->ops->set_mmss) {
+ else if (rtc->ops->set_mmss64) {
+ time64_t secs64 = rtc_tm_to_time64(tm);
+ err = rtc->ops->set_mmss64(rtc->dev.parent, secs64);
+ } else if (rtc->ops->set_mmss) {
unsigned long secs;
err = rtc_tm_to_time(tm, &secs);
if (err == 0)
@@ -98,6 +101,8 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs)
if (!rtc->ops)
err = -ENODEV;
+ else if (rtc->ops->set_mmss64)
+ err = rtc->ops->set_mmss64(rtc->dev.parent, secs);
else if (rtc->ops->set_mmss)
err = rtc->ops->set_mmss(rtc->dev.parent, secs);
else if (rtc->ops->read_time && rtc->ops->set_time) {
diff --git a/drivers/rtc/systohc.c b/drivers/rtc/systohc.c
index bf3e242..e34a07b 100644
--- a/drivers/rtc/systohc.c
+++ b/drivers/rtc/systohc.c
@@ -35,7 +35,10 @@ int rtc_set_ntp_time(struct timespec now)
if (rtc) {
/* rtc_hctosys exclusively uses UTC, so we call set_time here,
* not set_mmss. */
- if (rtc->ops && (rtc->ops->set_time || rtc->ops->set_mmss))
+ if (rtc->ops &&
+ (rtc->ops->set_time ||
+ rtc->ops->set_mmss64 ||
+ rtc->ops->set_mmss))
err = rtc_set_time(rtc, &tm);
rtc_class_close(rtc);
}
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 6d6be09..29093da 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -77,6 +77,7 @@ struct rtc_class_ops {
int (*read_alarm)(struct device *, struct rtc_wkalrm *);
int (*set_alarm)(struct device *, struct rtc_wkalrm *);
int (*proc)(struct device *, struct seq_file *);
+ int (*set_mmss64)(struct device *, time64_t secs);
int (*set_mmss)(struct device *, unsigned long secs);
int (*read_callback)(struct device *, int data);
int (*alarm_irq_enable)(struct device *, unsigned int enabled);
--
1.9.1
--
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