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SubjectRe: [PATCH 4/7] clocksource/cadence_ttc: Adjust interval in clock notifier
On 11/08/2013 10:21 PM, Soren Brinkmann wrote:
> The clockevent has to be reprogrammed if the timer's input
> clock frequency changes and the timer is in periodic mode, in order to
> maintain the correct timer interval.
>
> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
> ---
> drivers/clocksource/cadence_ttc_timer.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
> index a92350b55d32..68a336038d8f 100644
> --- a/drivers/clocksource/cadence_ttc_timer.c
> +++ b/drivers/clocksource/cadence_ttc_timer.c
> @@ -338,6 +338,10 @@ static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
> /* update cached frequency */
> ttc->freq = ndata->new_rate;
>
> + if (ttcce->ce.mode == CLOCK_EVT_MODE_PERIODIC)
> + ttc_set_interval(ttc, DIV_ROUND_CLOSEST(ttc->freq,
> + PRESCALE * HZ));
> +

Couldn't be racy ?

> /* fall through */
> }
> case PRE_RATE_CHANGE:
>


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