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When a user application wants to set the rtc time, the RTC subsystem takes advantage of 'rtc_valid_tm(tm)' to check 'rtc_time *tm' value validity, it make sure the 'tm->tm_year' is larger than 70,so if '70< tm_year < 100', the '(settm->tm_year - 100)' will be negative. ' Setting the negative value to hardware register will be invalid, so I add the 'if' condition to make sure set a valid value to register. Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>