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-rw-r--r--net/sched/sch_qfq.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 7c195d972bf0..8d86a8b5522a 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -821,7 +821,14 @@ static void qfq_make_eligible(struct qfq_sched *q)
unsigned long old_vslot = q->oldV >> q->min_slot_shift;
if (vslot != old_vslot) {
- unsigned long mask = (1ULL << fls(vslot ^ old_vslot)) - 1;
+ unsigned long mask;
+ int last_flip_pos = fls(vslot ^ old_vslot);
+
+ if (last_flip_pos > 31) /* higher than the number of groups */
+ mask = ~0UL; /* make all groups eligible */
+ else
+ mask = (1UL << last_flip_pos) - 1;
+
qfq_move_groups(q, mask, IR, ER);
qfq_move_groups(q, mask, IB, EB);
}

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