AcoSail/kernel_optimize_test
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timekeeping: Hold timekeepering locks in do_adjtimex and hardpps

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In moving the NTP state to be protected by the timekeeping locks,
be sure to acquire the timekeeping locks prior to calling
ntp functions.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2013-03-22 11:37:28 -07:00
parent cef90377fa
commit 06c017fdd4
1 changed files with 17 additions and 2 deletions
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19
kernel/time/timekeeping.c
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@ -787,10 +787,10 @@ void __init timekeeping_init(void)
boot.tv_nsec = 0;
}
ntp_init();
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&timekeeper_seq);
ntp_init();
clock = clocksource_default_clock();
if (clock->enable)
clock->enable(clock);
@ -1618,6 +1618,7 @@ EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
*/
int do_adjtimex(struct timex *txc)
{
unsigned long flags;
struct timespec ts;
s32 tai, orig_tai;
int ret;
@ -1641,8 +1642,14 @@ int do_adjtimex(struct timex *txc)
getnstimeofday(&ts);
orig_tai = tai = timekeeping_get_tai_offset();
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&timekeeper_seq);
ret = __do_adjtimex(txc, &ts, &tai);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
if (tai != orig_tai)
timekeeping_set_tai_offset(tai);
@ -1655,7 +1662,15 @@ int do_adjtimex(struct timex *txc)
*/
void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
{
unsigned long flags;
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&timekeeper_seq);
__hardpps(phase_ts, raw_ts);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
}
EXPORT_SYMBOL(hardpps);
#endif