powerpc/mpic_timer: fix convert ticks to time subtraction overflow

In some cases tmp_sec may be greater than ticks, because in the process
of calculation ticks and tmp_sec will be rounded.

Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/powerpc/sysdev/mpic_timer.c b/arch/powerpc/sysdev/mpic_timer.c
index 70dcf9c5b8fb..9d9b06217f8b 100644
--- a/arch/powerpc/sysdev/mpic_timer.c
+++ b/arch/powerpc/sysdev/mpic_timer.c
@@ -97,8 +97,11 @@ static void convert_ticks_to_time(struct timer_group_priv *priv,
         time->tv_sec = (__kernel_time_t)div_u64(ticks, priv->timerfreq);
         tmp_sec = (u64)time->tv_sec * (u64)priv->timerfreq;
 
-        time->tv_usec = (__kernel_suseconds_t)
-                div_u64((ticks - tmp_sec) * 1000000, priv->timerfreq);
+        time->tv_usec = 0;
+
+        if (tmp_sec <= ticks)
+                time->tv_usec = (__kernel_suseconds_t)
+                        div_u64((ticks - tmp_sec) * 1000000, priv->timerfreq);
 
         return;
 }