The kernel of bluetooth hci_core. C file hci_rx_work cannot understand-CodePudding

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The kernel of bluetooth hci_core. C file hci_rx_work cannot understand

Time：09-30

If (hci_dev_test_flag (hdev, HCI_USER_CHANNEL)) {
Kfree_skb (SKB);
continue;
}
Why is HCI_USER_CHANNEL SKB must be deleted this sign?