diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2019-04-10 14:32:37 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-04-10 12:20:46 -0700 |
| commit | b0a231a26d56265521abbb6db1748accd6bb036a (patch) | |
| tree | eebf7ab0e43d4ac498ad5039315bfb8e750cc13d /net/caif | |
| parent | 4c75be07f9385364be3a5033ff3a20faf3f3bce0 (diff) | |
| download | linux-b0a231a26d56265521abbb6db1748accd6bb036a.tar.gz linux-b0a231a26d56265521abbb6db1748accd6bb036a.tar.bz2 linux-b0a231a26d56265521abbb6db1748accd6bb036a.zip | |
net: caif: avoid using qdisc_qlen()
Such helper does not cope correctly with NOLOCK qdiscs.
In the following patches we will move back qlen to per CPU
values for such qdiscs, so qdisc_qlen_sum() is not an option,
too.
Instead, use qlen only for lock qdiscs, and always set
flow off for NOLOCK qdiscs with a not empty tx queue.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/caif')
| -rw-r--r-- | net/caif/caif_dev.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c index 711d7156efd8..6c6e01963aac 100644 --- a/net/caif/caif_dev.c +++ b/net/caif/caif_dev.c @@ -186,15 +186,19 @@ static int transmit(struct cflayer *layer, struct cfpkt *pkt) goto noxoff; if (likely(!netif_queue_stopped(caifd->netdev))) { + struct Qdisc *sch; + /* If we run with a TX queue, check if the queue is too long*/ txq = netdev_get_tx_queue(skb->dev, 0); - qlen = qdisc_qlen(rcu_dereference_bh(txq->qdisc)); - - if (likely(qlen == 0)) + sch = rcu_dereference_bh(txq->qdisc); + if (likely(qdisc_is_empty(sch))) goto noxoff; + /* can check for explicit qdisc len value only !NOLOCK, + * always set flow off otherwise + */ high = (caifd->netdev->tx_queue_len * q_high) / 100; - if (likely(qlen < high)) + if (!(sch->flags & TCQ_F_NOLOCK) && likely(sch->q.qlen < high)) goto noxoff; } |