Bluetooth: hci_core: don't call kfree_skb() under spin_lock_irqsave()

It is not allowed to call kfree_skb() from hardware interrupt
context or with interrupts being disabled. So replace kfree_skb()
with dev_kfree_skb_irq() under spin_lock_irqsave().

Fixes: 9238f36 ("Bluetooth: Add request cmd_complete and cmd_status functions")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/hci_core.c

@@ -3985,7 +3985,7 @@ void hci_req_cmd_complete(struct hci_dev *hdev, u16 opcode, u8 status,
 			*req_complete_skb = bt_cb(skb)->hci.req_complete_skb;
 		else
 			*req_complete = bt_cb(skb)->hci.req_complete;
-		kfree_skb(skb);
+		dev_kfree_skb_irq(skb);
 	}
 	spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);
 }