[PATCH resend net] sch_tbf: use do_div() for 64-bit divide

[Yang Yingliang <yangyingliang@huawei.com>]

It's doing a 64-bit divide which is not supported
on 32-bit architectures in psched_ns_t2l(). The
correct way to do this is to use do_div().

It's introduced by commit cc106e441a63
("net: sched: tbf: fix the calculation of max_size")

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

---
Change note:

Add commit which introduced this problem.
---
 net/sched/sch_tbf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index a44928c..887e672 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -131,8 +131,10 @@ static u64 psched_ns_t2l(const struct psched_ratecfg *r,
 
 	do_div(len, NSEC_PER_SEC);
 
-	if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
-		len = (len / 53) * 48;
+	if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) {
+		do_div(len, 53);
+		len = len * 48;
+	}
 
 	if (len > r->overhead)
 		len -= r->overhead;
-- 1.8.0