rtc: fix deadlock
if get_rtc_time() is _ever_ called with IRQs off, we deadlock badly in it, waiting for jiffies to increment. So make the code more robust by doing an explicit mdelay(20). This solves a very hard to reproduce/debug hard lockup reported by Mikael Pettersson. Reported-by: NMikael Pettersson <mikpe@it.uu.se> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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