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274 lines
5.4 KiB
274 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Bluetooth HCI UART driver |
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* |
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* Copyright (C) 2000-2001 Qualcomm Incorporated |
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* Copyright (C) 2002-2003 Maxim Krasnyansky <[email protected]> |
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* Copyright (C) 2004-2005 Marcel Holtmann <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/fcntl.h> |
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#include <linux/interrupt.h> |
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#include <linux/ptrace.h> |
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#include <linux/poll.h> |
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#include <linux/slab.h> |
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#include <linux/tty.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/signal.h> |
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#include <linux/ioctl.h> |
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#include <linux/skbuff.h> |
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#include <asm/unaligned.h> |
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#include <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#include "hci_uart.h" |
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struct h4_struct { |
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struct sk_buff *rx_skb; |
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struct sk_buff_head txq; |
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}; |
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/* Initialize protocol */ |
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static int h4_open(struct hci_uart *hu) |
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{ |
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struct h4_struct *h4; |
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BT_DBG("hu %p", hu); |
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h4 = kzalloc(sizeof(*h4), GFP_KERNEL); |
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if (!h4) |
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return -ENOMEM; |
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skb_queue_head_init(&h4->txq); |
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hu->priv = h4; |
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return 0; |
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} |
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/* Flush protocol data */ |
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static int h4_flush(struct hci_uart *hu) |
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{ |
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struct h4_struct *h4 = hu->priv; |
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BT_DBG("hu %p", hu); |
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skb_queue_purge(&h4->txq); |
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return 0; |
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} |
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/* Close protocol */ |
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static int h4_close(struct hci_uart *hu) |
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{ |
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struct h4_struct *h4 = hu->priv; |
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BT_DBG("hu %p", hu); |
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skb_queue_purge(&h4->txq); |
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kfree_skb(h4->rx_skb); |
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hu->priv = NULL; |
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kfree(h4); |
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return 0; |
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} |
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/* Enqueue frame for transmission (padding, crc, etc) */ |
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static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
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{ |
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struct h4_struct *h4 = hu->priv; |
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BT_DBG("hu %p skb %p", hu, skb); |
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/* Prepend skb with frame type */ |
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memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
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skb_queue_tail(&h4->txq, skb); |
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return 0; |
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} |
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static const struct h4_recv_pkt h4_recv_pkts[] = { |
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{ H4_RECV_ACL, .recv = hci_recv_frame }, |
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{ H4_RECV_SCO, .recv = hci_recv_frame }, |
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{ H4_RECV_EVENT, .recv = hci_recv_frame }, |
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{ H4_RECV_ISO, .recv = hci_recv_frame }, |
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}; |
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/* Recv data */ |
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static int h4_recv(struct hci_uart *hu, const void *data, int count) |
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{ |
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struct h4_struct *h4 = hu->priv; |
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if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) |
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return -EUNATCH; |
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h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count, |
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h4_recv_pkts, ARRAY_SIZE(h4_recv_pkts)); |
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if (IS_ERR(h4->rx_skb)) { |
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int err = PTR_ERR(h4->rx_skb); |
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bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err); |
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h4->rx_skb = NULL; |
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return err; |
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} |
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return count; |
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} |
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static struct sk_buff *h4_dequeue(struct hci_uart *hu) |
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{ |
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struct h4_struct *h4 = hu->priv; |
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return skb_dequeue(&h4->txq); |
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} |
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static const struct hci_uart_proto h4p = { |
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.id = HCI_UART_H4, |
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.name = "H4", |
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.open = h4_open, |
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.close = h4_close, |
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.recv = h4_recv, |
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.enqueue = h4_enqueue, |
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.dequeue = h4_dequeue, |
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.flush = h4_flush, |
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}; |
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int __init h4_init(void) |
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{ |
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return hci_uart_register_proto(&h4p); |
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} |
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int __exit h4_deinit(void) |
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{ |
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return hci_uart_unregister_proto(&h4p); |
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} |
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struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb, |
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const unsigned char *buffer, int count, |
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const struct h4_recv_pkt *pkts, int pkts_count) |
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{ |
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struct hci_uart *hu = hci_get_drvdata(hdev); |
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u8 alignment = hu->alignment ? hu->alignment : 1; |
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/* Check for error from previous call */ |
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if (IS_ERR(skb)) |
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skb = NULL; |
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while (count) { |
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int i, len; |
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/* remove padding bytes from buffer */ |
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for (; hu->padding && count > 0; hu->padding--) { |
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count--; |
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buffer++; |
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} |
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if (!count) |
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break; |
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if (!skb) { |
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for (i = 0; i < pkts_count; i++) { |
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if (buffer[0] != (&pkts[i])->type) |
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continue; |
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skb = bt_skb_alloc((&pkts[i])->maxlen, |
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GFP_ATOMIC); |
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if (!skb) |
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return ERR_PTR(-ENOMEM); |
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hci_skb_pkt_type(skb) = (&pkts[i])->type; |
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hci_skb_expect(skb) = (&pkts[i])->hlen; |
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break; |
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} |
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/* Check for invalid packet type */ |
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if (!skb) |
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return ERR_PTR(-EILSEQ); |
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count -= 1; |
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buffer += 1; |
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} |
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len = min_t(uint, hci_skb_expect(skb) - skb->len, count); |
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skb_put_data(skb, buffer, len); |
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count -= len; |
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buffer += len; |
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/* Check for partial packet */ |
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if (skb->len < hci_skb_expect(skb)) |
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continue; |
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for (i = 0; i < pkts_count; i++) { |
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if (hci_skb_pkt_type(skb) == (&pkts[i])->type) |
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break; |
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} |
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if (i >= pkts_count) { |
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kfree_skb(skb); |
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return ERR_PTR(-EILSEQ); |
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} |
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if (skb->len == (&pkts[i])->hlen) { |
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u16 dlen; |
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switch ((&pkts[i])->lsize) { |
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case 0: |
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/* No variable data length */ |
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dlen = 0; |
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break; |
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case 1: |
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/* Single octet variable length */ |
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dlen = skb->data[(&pkts[i])->loff]; |
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hci_skb_expect(skb) += dlen; |
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if (skb_tailroom(skb) < dlen) { |
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kfree_skb(skb); |
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return ERR_PTR(-EMSGSIZE); |
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} |
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break; |
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case 2: |
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/* Double octet variable length */ |
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dlen = get_unaligned_le16(skb->data + |
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(&pkts[i])->loff); |
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hci_skb_expect(skb) += dlen; |
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if (skb_tailroom(skb) < dlen) { |
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kfree_skb(skb); |
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return ERR_PTR(-EMSGSIZE); |
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} |
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break; |
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default: |
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/* Unsupported variable length */ |
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kfree_skb(skb); |
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return ERR_PTR(-EILSEQ); |
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} |
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if (!dlen) { |
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hu->padding = (skb->len - 1) % alignment; |
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hu->padding = (alignment - hu->padding) % alignment; |
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/* No more data, complete frame */ |
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(&pkts[i])->recv(hdev, skb); |
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skb = NULL; |
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} |
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} else { |
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hu->padding = (skb->len - 1) % alignment; |
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hu->padding = (alignment - hu->padding) % alignment; |
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/* Complete frame */ |
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(&pkts[i])->recv(hdev, skb); |
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skb = NULL; |
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} |
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} |
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return skb; |
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} |
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EXPORT_SYMBOL_GPL(h4_recv_buf);
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