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hamradio: don't call dev_kfree_skb() under spin_lock_irqsave() 

It is not allowed to call kfree_skb() or consume_skb() from hardware
interrupt context or with hardware interrupts being disabled.

It should use dev_kfree_skb_irq() or dev_consume_skb_irq() instead.
The difference between them is free reason, dev_kfree_skb_irq() means
the SKB is dropped in error and dev_consume_skb_irq() means the SKB
is consumed in normal.

In scc_discard_buffers(), dev_kfree_skb() is called to discard the SKBs,
so replace it with dev_kfree_skb_irq().

In scc_net_tx(), dev_kfree_skb() is called to drop the SKB that exceed
queue length, so replace it with dev_kfree_skb_irq().

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yang Yingliang 2022-12-08 22:21:46 +08:00 committed by David S. Miller
parent f07fadcbee
commit 3727f74291
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/hamradio/scc.c
View File

@ -302,12 +302,12 @@ static inline void scc_discard_buffers(struct scc_channel *scc)
spin_lock_irqsave(&scc->lock, flags);
if (scc->tx_buff != NULL)
{
dev_kfree_skb(scc->tx_buff);
dev_kfree_skb_irq(scc->tx_buff);
scc->tx_buff = NULL;
}
while (!skb_queue_empty(&scc->tx_queue))
dev_kfree_skb(skb_dequeue(&scc->tx_queue));
dev_kfree_skb_irq(skb_dequeue(&scc->tx_queue));
spin_unlock_irqrestore(&scc->lock, flags);
}
@ -1668,7 +1668,7 @@ static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
struct sk_buff *skb_del;
skb_del = skb_dequeue(&scc->tx_queue);
dev_kfree_skb(skb_del);
dev_kfree_skb_irq(skb_del);
}
skb_queue_tail(&scc->tx_queue, skb);
netif_trans_update(dev);