[PATCH] net: dsa: ocelot: use div64_u64() instead of do_div()

[Qing Wang]

From: Wang Qing <wangqing@xxxxxxxx>

do_div() does a 64-by-32 division.
When the divisor is u64, do_div() truncates it to 32 bits, this means it
can test non-zero and be truncated to zero for division.

fix do_div.cocci warning:
do_div() does a 64-by-32 division, please consider using div64_u64 instead.

Signed-off-by: Wang Qing <wangqing@xxxxxxxx>
---
 drivers/net/dsa/ocelot/felix_vsc9959.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index bf8d382..5c2482f
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1178,7 +1178,7 @@ static void vsc9959_new_base_time(struct ocelot *ocelot, ktime_t base_time,
 	if (base_time < current_time) {
 		u64 nr_of_cycles = current_time - base_time;
 
-		do_div(nr_of_cycles, cycle_time);
+		div64_u64(nr_of_cycles, cycle_time);
 		new_base_time += cycle_time * (nr_of_cycles + 1);
 	}
 
-- 
2.7.4