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timekeeping: Simplify tai updating from do_adjtimex 

Since we are taking the timekeeping locks, just go ahead
and update any tai change directly, rather then dropping
the lock and calling a function that will just take it again.

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 14:20:03 -07:00
parent 06c017fdd4
commit 0b5154fb90
1 changed files with 4 additions and 5 deletions
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9
kernel/time/timekeeping.c
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@ -1618,9 +1618,10 @@ EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset);
*/
int do_adjtimex(struct timex *txc)
{
struct timekeeper *tk = &timekeeper;
unsigned long flags;
struct timespec ts;
s32 tai, orig_tai;
s32 tai;
int ret;
/* Validate the data before disabling interrupts */
@ -1640,19 +1641,17 @@ 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);
tai = tk->tai_offset;
ret = __do_adjtimex(txc, &ts, &tai);
__timekeeping_set_tai_offset(tk, tai);
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
if (tai != orig_tai)
timekeeping_set_tai_offset(tai);
return ret;
}