From 8e4ff1a81aa91d12856287c7103d0301ac91351a Mon Sep 17 00:00:00 2001 From: Xunlei Pang Date: Wed, 1 Apr 2015 20:34:27 -0700 Subject: [PATCH] drivers/rtc: Provide y2038 safe rtc_class_ops.set_mmss() replacement Currently the rtc_class_op's set_mmss() function takes a 32-bit second value (on 32-bit 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 [jstultz: Add whitespace fix for checkpatch] Signed-off-by: John Stultz Acked-by: Alessandro Zummo Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1427945681-29972-8-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar --- 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 37215cf983e9..d43ee409a5f2 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 ef3c07a52c3a..7728d5e32bf4 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 dcad7ee0d746..8dcf6825fa88 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); -- 2.20.1