[patch 5/5] staging: ozwpan: Fix hrtimer wreckage

[Thomas Gleixner]

oz_timer_add() modifies the expiry value of an active timer, which
results in data corruption.

Use hrtimer_start() and remove the silly conditional.

While at it use the proper helper function to convert milliseconds to
ktime.

Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Cc: Shigekatsu Tateno <shigekatsu.tateno at atmel.com>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Cc: devel at driverdev.osuosl.org
---
 drivers/staging/ozwpan/ozproto.c |   17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

Index: linux/drivers/staging/ozwpan/ozproto.c
===================================================================
--- linux.orig/drivers/staging/ozwpan/ozproto.c
+++ linux/drivers/staging/ozwpan/ozproto.c
@@ -566,23 +566,14 @@ void oz_timer_add(struct oz_pd *pd, int
 	switch (type) {
 	case OZ_TIMER_TOUT:
 	case OZ_TIMER_STOP:
-		if (hrtimer_active(&pd->timeout)) {
-			hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
-			MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
-							NSEC_PER_MSEC));
-			hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
-		} else {
-			hrtimer_start(&pd->timeout, ktime_set(due_time /
-			MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
-					NSEC_PER_MSEC), HRTIMER_MODE_REL);
-		}
+		hrtimer_start(&pd->timeout, ms_to_ktime(due_time),
+			      HRTIMER_MODE_REL);
 		pd->timeout_type = type;
 		break;
 	case OZ_TIMER_HEARTBEAT:
 		if (!hrtimer_active(&pd->heartbeat))
-			hrtimer_start(&pd->heartbeat, ktime_set(due_time /
-			MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
-					NSEC_PER_MSEC), HRTIMER_MODE_REL);
+			hrtimer_start(&pd->heartbeat, ms_to_ktime(due_time),
+				      HRTIMER_MODE_REL);
 		break;
 	}
 	spin_unlock_bh(&g_polling_lock);