time: ntp: refactor do_adjtimex() some more
Impact: cleanup, no functionality changed
Further simplify do_adjtimex():
- introduce the ntp_start_leap_timer() helper function
- eliminate the goto adj_done complication
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index aded09b..4346ed6 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -332,14 +332,33 @@
static inline void notify_cmos_timer(void) { }
#endif
+/*
+ * Start the leap seconds timer:
+ */
+static inline void ntp_start_leap_timer(struct timespec *ts)
+{
+ long now = ts->tv_sec;
+
+ if (time_status & STA_INS) {
+ time_state = TIME_INS;
+ now += 86400 - now % 86400;
+ hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);
+
+ return;
+ }
+
+ if (time_status & STA_DEL) {
+ time_state = TIME_DEL;
+ now += 86400 - (now + 1) % 86400;
+ hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);
+ }
+}
/*
* Propagate a new txc->status value into the NTP state:
*/
static inline void process_adj_status(struct timex *txc, struct timespec *ts)
{
- long now;
-
if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
time_state = TIME_OK;
time_status = STA_UNSYNC;
@@ -358,22 +377,12 @@
switch (time_state) {
case TIME_OK:
- start_timer:
- now = ts->tv_sec;
- if (time_status & STA_INS) {
- time_state = TIME_INS;
- now += 86400 - now % 86400;
- hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);
- } else if (time_status & STA_DEL) {
- time_state = TIME_DEL;
- now += 86400 - (now + 1) % 86400;
- hrtimer_start(&leap_timer, ktime_set(now, 0), HRTIMER_MODE_ABS);
- }
+ ntp_start_leap_timer(ts);
break;
case TIME_INS:
case TIME_DEL:
time_state = TIME_OK;
- goto start_timer;
+ ntp_start_leap_timer(ts);
case TIME_WAIT:
if (!(time_status & (STA_INS | STA_DEL)))
time_state = TIME_OK;
@@ -394,6 +403,7 @@
if (txc->modes & ADJ_NANO)
time_status |= STA_NANO;
+
if (txc->modes & ADJ_MICRO)
time_status &= ~STA_NANO;
@@ -405,6 +415,7 @@
if (txc->modes & ADJ_MAXERROR)
time_maxerror = txc->maxerror;
+
if (txc->modes & ADJ_ESTERROR)
time_esterror = txc->esterror;
@@ -421,6 +432,7 @@
if (txc->modes & ADJ_OFFSET)
ntp_update_offset(txc->offset);
+
if (txc->modes & ADJ_TICK)
tick_usec = txc->tick;
@@ -457,7 +469,7 @@
if (txc->modes & ADJ_TICK &&
(txc->tick < 900000/USER_HZ ||
txc->tick > 1100000/USER_HZ))
- return -EINVAL;
+ return -EINVAL;
if (txc->modes & ADJ_STATUS && time_state != TIME_OK)
hrtimer_cancel(&leap_timer);
@@ -467,7 +479,6 @@
write_seqlock_irq(&xtime_lock);
- /* If there are input parameters, then process them */
if (txc->modes & ADJ_ADJTIME) {
long save_adjust = time_adjust;
@@ -477,19 +488,18 @@
ntp_update_frequency();
}
txc->offset = save_adjust;
- goto adj_done;
+ } else {
+
+ /* If there are input parameters, then process them: */
+ if (txc->modes)
+ process_adjtimex_modes(txc, &ts);
+
+ txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
+ NTP_SCALE_SHIFT);
+ if (!(time_status & STA_NANO))
+ txc->offset /= NSEC_PER_USEC;
}
- /* If there are input parameters, then process them: */
- if (txc->modes)
- process_adjtimex_modes(txc, &ts);
-
- txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
- NTP_SCALE_SHIFT);
- if (!(time_status & STA_NANO))
- txc->offset /= NSEC_PER_USEC;
-
-adj_done:
result = time_state; /* mostly `TIME_OK' */
if (time_status & (STA_UNSYNC|STA_CLOCKERR))
result = TIME_ERROR;
@@ -514,6 +524,7 @@
txc->calcnt = 0;
txc->errcnt = 0;
txc->stbcnt = 0;
+
write_sequnlock_irq(&xtime_lock);
txc->time.tv_sec = ts.tv_sec;
