修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/net/core/netpoll.c
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@@ -137,6 +137,20 @@
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 	}
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 }
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+static int netif_local_xmit_active(struct net_device *dev)
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+{
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+	int i;
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+
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+	for (i = 0; i < dev->num_tx_queues; i++) {
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+		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
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+
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+		if (READ_ONCE(txq->xmit_lock_owner) == smp_processor_id())
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+			return 1;
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+	}
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+
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+	return 0;
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+}
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+
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 static void poll_one_napi(struct napi_struct *napi)
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 {
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 	int work;
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@@ -183,7 +197,10 @@
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 	if (!ni || down_trylock(&ni->dev_lock))
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 		return;
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-	if (!netif_running(dev)) {
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+	/* Some drivers will take the same locks in poll and xmit,
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+	 * we can't poll if local CPU is already in xmit.
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+	 */
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+	if (!netif_running(dev) || netif_local_xmit_active(dev)) {
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 		up(&ni->dev_lock);
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 		return;
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 	}