Messages in this thread | | | Date | Wed, 18 Feb 2015 18:38:52 +0100 | From | Jiri Bohac <> | Subject | Re: [PATCH] time, ntp: Do not update time_state in middle of leap second [v3] |
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On Wed, Feb 18, 2015 at 06:14:04PM +0100, Jiri Bohac wrote: > I think the only real problem occurs when the adjtimex is called in the > the TIME_OOP state
... or the TIME_WAIT state ...
> with STA_PLL cleared _and_ STA_INS set. > In this case the state machine is reset to TIME_OK but goes back > to TIME_INS on the next second_overflow, potentially causing > another false leap second to be inserted on the following > midnight. > > The state machine is meant to only go back to TIME_INS once STA_INS is > cleared and then set again - this is what the TIME_WAIT state is > for. > > In fact, I don't see a reason why the STA_PLL -> !STA_PLL transition should > ever set the time_state to TIME_OK. > - When the STA_INS/STA_DEL flag is removed from the status, the state > machine will end up in TIME_OK from any state. > - When STA_INS/STA_DEL is set in > the status, the state mchine will transition from TIME_OK to > TIME_INS/TIME_DEL anyway. > > I think the "time_status = TIME_OK" should be just dropped. > > It has been added by eea83d896e318bda54be2d2770d2c5d6668d11db > (ntp: NTP4 user space bits update) and it's not clear why. > Roman?
-- Jiri Bohac <jbohac@suse.cz> SUSE Labs, SUSE CZ
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