net: ethernet: dnet: don't call dev_kfree_skb() under spin_lock_irqsave()

[ Upstream commit f07fadcbee2a5e84caa67c7c445424200bffb60b ]

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

In this case, the lock is used to protected 'bp', so we can move
dev_kfree_skb() after the spin_unlock_irqrestore().

Fixes: 4796417417a6 ("dnet: Dave DNET ethernet controller driver (updated)")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/dnet.c b/drivers/net/ethernet/dnet.c
index 6c51cf9..14dc2e1 100644 (file)
--- a/drivers/net/ethernet/dnet.c
+++ b/drivers/net/ethernet/dnet.c
@@ -550,11 +550,11 @@ static netdev_tx_t dnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
        skb_tx_timestamp(skb);
 
+       spin_unlock_irqrestore(&bp->lock, flags);
+
        /* free the buffer */
        dev_kfree_skb(skb);
 
-       spin_unlock_irqrestore(&bp->lock, flags);
-
        return NETDEV_TX_OK;
 }