From: Sebastian Andrzej Siewior bigeasy@linutronix.de
[ Upstream commit d5c7652eb16fa203d82546e0285136d7b321ffa9 ]
The hsr device is a software device. Its net_device_ops::ndo_start_xmit() routine will process the packet and then pass the resulting skb to dev_queue_xmit(). During processing, hsr acquires a lock with spin_lock_bh() (hsr_add_node()) which needs to be promoted to the _irq() suffix in order to avoid a potential deadlock. Then there are the warnings in dev_queue_xmit() (due to local_bh_disable() with disabled interrupts) left.
Instead trying to address those (there is qdisc and…) for netpoll sake, just disable netpoll on hsr.
Disable netpoll on hsr and replace the _irqsave() locking with _bh().
Fixes: f421436a591d3 ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)") Signed-off-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/hsr/hsr_device.c | 14 ++++++-------- net/hsr/hsr_forward.c | 5 ++--- 2 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c index 7449c3c95317..037ad39564a4 100644 --- a/net/hsr/hsr_device.c +++ b/net/hsr/hsr_device.c @@ -278,7 +278,6 @@ static void send_hsr_supervision_frame(struct hsr_port *master, __u8 type = HSR_TLV_LIFE_CHECK; struct hsr_sup_payload *hsr_sp; struct hsr_sup_tag *hsr_stag; - unsigned long irqflags; struct sk_buff *skb;
*interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); @@ -299,7 +298,7 @@ static void send_hsr_supervision_frame(struct hsr_port *master, set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version);
/* From HSRv1 on we have separate supervision sequence numbers. */ - spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); + spin_lock_bh(&hsr->seqnr_lock); if (hsr->prot_version > 0) { hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); hsr->sup_sequence_nr++; @@ -307,7 +306,7 @@ static void send_hsr_supervision_frame(struct hsr_port *master, hsr_stag->sequence_nr = htons(hsr->sequence_nr); hsr->sequence_nr++; } - spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); + spin_unlock_bh(&hsr->seqnr_lock);
hsr_stag->HSR_TLV_type = type; /* TODO: Why 12 in HSRv0? */ @@ -332,7 +331,6 @@ static void send_prp_supervision_frame(struct hsr_port *master, struct hsr_priv *hsr = master->hsr; struct hsr_sup_payload *hsr_sp; struct hsr_sup_tag *hsr_stag; - unsigned long irqflags; struct sk_buff *skb;
skb = hsr_init_skb(master); @@ -347,7 +345,7 @@ static void send_prp_supervision_frame(struct hsr_port *master, set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0));
/* From HSRv1 on we have separate supervision sequence numbers. */ - spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); + spin_lock_bh(&hsr->seqnr_lock); hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); hsr->sup_sequence_nr++; hsr_stag->HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; @@ -358,11 +356,11 @@ static void send_prp_supervision_frame(struct hsr_port *master, ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
if (skb_put_padto(skb, ETH_ZLEN)) { - spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); + spin_unlock_bh(&hsr->seqnr_lock); return; }
- spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); + spin_unlock_bh(&hsr->seqnr_lock);
hsr_forward_skb(skb, master); } @@ -443,7 +441,7 @@ void hsr_dev_setup(struct net_device *dev) dev->header_ops = &hsr_header_ops; dev->netdev_ops = &hsr_device_ops; SET_NETDEV_DEVTYPE(dev, &hsr_type); - dev->priv_flags |= IFF_NO_QUEUE; + dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
dev->needs_free_netdev = true;
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index 15653d3bb6ac..142bed7f1fea 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -437,7 +437,6 @@ static void handle_std_frame(struct sk_buff *skb, { struct hsr_port *port = frame->port_rcv; struct hsr_priv *hsr = port->hsr; - unsigned long irqflags;
frame->skb_hsr = NULL; frame->skb_prp = NULL; @@ -447,10 +446,10 @@ static void handle_std_frame(struct sk_buff *skb, frame->is_from_san = true; } else { /* Sequence nr for the master node */ - spin_lock_irqsave(&hsr->seqnr_lock, irqflags); + spin_lock_bh(&hsr->seqnr_lock); frame->sequence_nr = hsr->sequence_nr; hsr->sequence_nr++; - spin_unlock_irqrestore(&hsr->seqnr_lock, irqflags); + spin_unlock_bh(&hsr->seqnr_lock); } }