timekeeping: Move ADJ_SETOFFSET to top level do_adjtimex()

Since ADJ_SETOFFSET adjusts the timekeeping state, process
it as part of the top level do_adjtimex() function in
timekeeping.c.

This avoids deadlocks that could occur once we change the
ntp locking rules.

Cc: Thomas Gleixner <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Signed-off-by: John Stultz <[email protected]>

Author: johnstultz-work

kernel/time/ntp.c

@@ -666,17 +666,6 @@ int __do_adjtimex(struct timex *txc, struct timespec *ts, s32 *time_tai)
 {
 	int result;
 
-	if (txc->modes & ADJ_SETOFFSET) {
-		struct timespec delta;
-		delta.tv_sec  = txc->time.tv_sec;
-		delta.tv_nsec = txc->time.tv_usec;
-		if (!(txc->modes & ADJ_NANO))
-			delta.tv_nsec *= 1000;
-		result = timekeeping_inject_offset(&delta);
-		if (result)
-			return result;
-	}
-
 	raw_spin_lock_irq(&ntp_lock);
 
 	if (txc->modes & ADJ_ADJTIME) {

kernel/time/timekeeping.c

@@ -1627,6 +1627,17 @@ int do_adjtimex(struct timex *txc)
 	if (ret)
 		return ret;
 
+	if (txc->modes & ADJ_SETOFFSET) {
+		struct timespec delta;
+		delta.tv_sec  = txc->time.tv_sec;
+		delta.tv_nsec = txc->time.tv_usec;
+		if (!(txc->modes & ADJ_NANO))
+			delta.tv_nsec *= 1000;
+		ret = timekeeping_inject_offset(&delta);
+		if (ret)
+			return ret;
+	}
+
 	getnstimeofday(&ts);
 	orig_tai = tai = timekeeping_get_tai_offset();