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authorPaolo Abeni <pabeni@redhat.com>2019-04-10 14:32:37 +0200
committerDavid S. Miller <davem@davemloft.net>2019-04-10 12:20:46 -0700
commitb0a231a26d56265521abbb6db1748accd6bb036a (patch)
treeeebf7ab0e43d4ac498ad5039315bfb8e750cc13d /net/caif
parent4c75be07f9385364be3a5033ff3a20faf3f3bce0 (diff)
downloadblackbird-op-linux-b0a231a26d56265521abbb6db1748accd6bb036a.tar.gz
blackbird-op-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.c12
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;
}
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