Commit 9033fd8b authored by Xunlei Pang's avatar Xunlei Pang Committed by Alexandre Belloni
Browse files

rtc: sunxi: Replace deprecated rtc_tm_to_time() 



sunxi_rtc_setalarm() uses deprecated rtc_tm_to_time(),
which will overflow in year 2106 on 32-bit machines.

This patch solves this by:
- Replacing rtc_tm_to_time() with rtc_tm_sub()

Also remove the unnecessary initial zeroing of some
local variables in sunxi_rtc_setalarm().

Cc: Carlo Caione <carlo.caione@gmail.com>
Signed-off-by: default avatarXunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent f118db1e

drivers/rtc/rtc-sunxi.c

+15 −17
Original line number Diff line number Diff line
@@ -269,14 +269,13 @@ static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) 
	struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);

	struct rtc_time *alrm_tm = &wkalrm->time;

	struct rtc_time tm_now;

	u32 alrm = 0;

	unsigned long time_now = 0;

	unsigned long time_set = 0;

	unsigned long time_gap = 0;

	unsigned long time_gap_day = 0;

	unsigned long time_gap_hour = 0;

	unsigned long time_gap_min = 0;

	int ret = 0;

	u32 alrm;

	time64_t diff;

	unsigned long time_gap;

	unsigned long time_gap_day;

	unsigned long time_gap_hour;

	unsigned long time_gap_min;

	int ret;



	ret = sunxi_rtc_gettime(dev, &tm_now);

	if (ret < 0) {
@@ -284,14 +283,18 @@ static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) 
		return -EINVAL;

	}



	rtc_tm_to_time(alrm_tm, &time_set);

	rtc_tm_to_time(&tm_now, &time_now);

	if (time_set <= time_now) {

	diff = rtc_tm_sub(alrm_tm, &tm_now);

	if (diff <= 0) {

		dev_err(dev, "Date to set in the past\n");

		return -EINVAL;

	}



	time_gap = time_set - time_now;

	if (diff > 255 * SEC_IN_DAY) {

		dev_err(dev, "Day must be in the range 0 - 255\n");

		return -EINVAL;

	}



	time_gap = diff;

	time_gap_day = time_gap / SEC_IN_DAY;

	time_gap -= time_gap_day * SEC_IN_DAY;

	time_gap_hour = time_gap / SEC_IN_HOUR;
@@ -299,11 +302,6 @@ static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) 
	time_gap_min = time_gap / SEC_IN_MIN;

	time_gap -= time_gap_min * SEC_IN_MIN;



	if (time_gap_day > 255) {

		dev_err(dev, "Day must be in the range 0 - 255\n");

		return -EINVAL;

	}



	sunxi_rtc_setaie(0, chip);

	writel(0, chip->base + SUNXI_ALRM_DHMS);

	usleep_range(100, 300);

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