[PATCH 07/21] rtc: Provide y2038 safe rtc_class_ops.set_mmss() replacement

John Stultz
2015-04-02T03:35:05Z

From: Xunlei Pang <pang.xunlei@linaro.org>

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.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
[jstultz: Add whitespace fix for checkpatch]
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
drivers/rtc/interface.c | 8 +++++++-
drivers/rtc/systohc.c | 5 ++++-
include/linux/rtc.h | 1 +
3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 37215cf..d43ee40 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -72,7 +72,11 @@ 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) {
time64_t secs64 = rtc_tm_to_time64(tm);
err = rtc->ops->set_mmss(rtc->dev.parent, secs64);
} else
@@ -96,6 +100,8 @@ 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 ef3c07a..7728d5e 100644
--- a/drivers/rtc/systohc.c
+++ b/drivers/rtc/systohc.c
@@ -35,7 +35,10 @@ int rtc_set_ntp_time(struct timespec64 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 dcad7ee..8dcf682 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