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rtc: wilco-ec: Handle reading invalid times

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If the RTC HW returns an invalid time, the rtc_year_days()
call would crash. This patch adds error logging in this
situation, and removes the tm_yday and tm_wday calculations.
These fields should not be relied upon by userspace
according to man rtc, and thus we don't need to calculate
them.

Signed-off-by: Nick Crews <ncrews@chromium.org>
Reviewed-by: Daniel Campello <campello@chromium.org>
Link: https://lore.kernel.org/r/20191004142608.170159-1-ncrews@chromium.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Nick Crews 2019-10-04 08:26:08 -06:00 committed by Alexandre Belloni
parent 147dae76db
commit 9aa0d0be38
1 changed files with 5 additions and 3 deletions
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8
drivers/rtc/rtc-wilco-ec.c
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@ -110,10 +110,12 @@ static int wilco_ec_rtc_read(struct device *dev, struct rtc_time *tm)
tm->tm_mday = rtc.day;
tm->tm_mon = rtc.month - 1;
tm->tm_year = rtc.year + (rtc.century * 100) - 1900;
tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
/* Ignore other tm fields, man rtc says userspace shouldn't use them. */
/* Don't compute day of week, we don't need it. */
tm->tm_wday = -1;
if (rtc_valid_tm(tm)) {
dev_err(dev, "Time from RTC is invalid: %ptRr\n", tm);
return -EIO;
}
return 0;
}