rtc: interface: use timeu64_t for range_max

For rtc drivers where rtc->range_max is set U64_MAX, like the PS3 rtc,
rtc_valid_range() always returns -ERANGE. This is because the local
variable range_max has type time64_t, so the test
	if (time < range_min || time > range_max)
		return -ERANGE;
becomes (time < range_min || time > -1), which always evaluates to true.
timeu64_t should be used, since it's the type of rtc->range_max.

Signed-off-by: Emmanuel Nicolet <emmanuel.nicolet@gmail.com>
Link: https://lore.kernel.org/r/20190927110446.GA6289@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index c93ef33..eea7007 100644 (file)
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -70,7 +70,7 @@ static int rtc_valid_range(struct rtc_device *rtc, struct rtc_time *tm)
                time64_t time = rtc_tm_to_time64(tm);
                time64_t range_min = rtc->set_start_time ? rtc->start_secs :
                        rtc->range_min;
-               time64_t range_max = rtc->set_start_time ?
+               timeu64_t range_max = rtc->set_start_time ?
                        (rtc->start_secs + rtc->range_max - rtc->range_min) :
                        rtc->range_max;