net: Audit drivers to identify those needing IFF_TX_SKB_SHARING cleared

After the last patch, We are left in a state in which only drivers calling
ether_setup have IFF_TX_SKB_SHARING set (we assume that drivers touching real
hardware call ether_setup for their net_devices and don't hold any state in
their skbs.  There are a handful of drivers that violate this assumption of
course, and need to be fixed up.  This patch identifies those drivers, and marks
them as not being able to support the safe transmission of skbs by clearning the
IFF_TX_SKB_SHARING flag in priv_flags

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Karsten Keil <isdn@linux-pingi.de>
CC: "David S. Miller" <davem@davemloft.net>
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: Patrick McHardy <kaber@trash.net>
CC: Krzysztof Halasa <khc@pm.waw.pl>
CC: "John W. Linville" <linville@tuxdriver.com>
CC: Greg Kroah-Hartman <gregkh@suse.de>
CC: Marcel Holtmann <marcel@holtmann.org>
CC: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
static int mpi_send_packet (struct net_device *dev)
{
	struct sk_buff *skb;
	unsigned char *buffer;
	s16 len;
	__le16 *payloadLen;
	struct airo_info *ai = dev->ml_priv;
	u8 *sendbuf;

	/* get a packet to send */

	if ((skb = skb_dequeue(&ai->txq)) == NULL) {
		airo_print_err(dev->name,
			"%s: Dequeue'd zero in send_packet()",
			__func__);
		return 0;
	}

	/* check min length*/
	len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	buffer = skb->data;

	ai->txfids[0].tx_desc.offset = 0;
	ai->txfids[0].tx_desc.valid = 1;
	ai->txfids[0].tx_desc.eoc = 1;
	ai->txfids[0].tx_desc.len =len+sizeof(WifiHdr);

/*
 * Magic, the cards firmware needs a length count (2 bytes) in the host buffer
 * right after  TXFID_HDR.The TXFID_HDR contains the status short so payloadlen
 * is immediately after it. ------------------------------------------------
 *                         |TXFIDHDR+STATUS|PAYLOADLEN|802.3HDR|PACKETDATA|
 *                         ------------------------------------------------
 */

	memcpy((char *)ai->txfids[0].virtual_host_addr,
		(char *)&wifictlhdr8023, sizeof(wifictlhdr8023));

	payloadLen = (__le16 *)(ai->txfids[0].virtual_host_addr +
		sizeof(wifictlhdr8023));
	sendbuf = ai->txfids[0].virtual_host_addr +
		sizeof(wifictlhdr8023) + 2 ;

	/*
	 * Firmware automatically puts 802 header on so
	 * we don't need to account for it in the length
	 */
	if (test_bit(FLAG_MIC_CAPABLE, &ai->flags) && ai->micstats.enabled &&
		(ntohs(((__be16 *)buffer)[6]) != 0x888E)) {
		MICBuffer pMic;

		if (encapsulate(ai, (etherHead *)buffer, &pMic, len - sizeof(etherHead)) != SUCCESS)
			return ERROR;

		*payloadLen = cpu_to_le16(len-sizeof(etherHead)+sizeof(pMic));
		ai->txfids[0].tx_desc.len += sizeof(pMic);
		/* copy data into airo dma buffer */
		memcpy (sendbuf, buffer, sizeof(etherHead));
		buffer += sizeof(etherHead);
		sendbuf += sizeof(etherHead);
		memcpy (sendbuf, &pMic, sizeof(pMic));
		sendbuf += sizeof(pMic);
		memcpy (sendbuf, buffer, len - sizeof(etherHead));
	} else {
		*payloadLen = cpu_to_le16(len - sizeof(etherHead));

		dev->trans_start = jiffies;

		/* copy data into airo dma buffer */
		memcpy(sendbuf, buffer, len);
	}

	memcpy_toio(ai->txfids[0].card_ram_off,
		&ai->txfids[0].tx_desc, sizeof(TxFid));

	OUT4500(ai, EVACK, 8);

	dev_kfree_skb_any(skb);
	return 1;
}

static int mpi_send_packet (struct net_device *dev)
{
	struct sk_buff *skb;
	unsigned char *buffer;
	s16 len;
	__le16 *payloadLen;
	struct airo_info *ai = dev->ml_priv;
	u8 *sendbuf;

	/* get a packet to send */

	if ((skb = skb_dequeue(&ai->txq)) == NULL) {
		airo_print_err(dev->name,
			"%s: Dequeue'd zero in send_packet()",
			__func__);
		return 0;
	}

	/* check min length*/
	len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	buffer = skb->data;

	ai->txfids[0].tx_desc.offset = 0;
	ai->txfids[0].tx_desc.valid = 1;
	ai->txfids[0].tx_desc.eoc = 1;
	ai->txfids[0].tx_desc.len =len+sizeof(WifiHdr);

/*
 * Magic, the cards firmware needs a length count (2 bytes) in the host buffer
 * right after  TXFID_HDR.The TXFID_HDR contains the status short so payloadlen
 * is immediately after it. ------------------------------------------------
 *                         |TXFIDHDR+STATUS|PAYLOADLEN|802.3HDR|PACKETDATA|
 *                         ------------------------------------------------
 */

	memcpy((char *)ai->txfids[0].virtual_host_addr,
		(char *)&wifictlhdr8023, sizeof(wifictlhdr8023));

	payloadLen = (__le16 *)(ai->txfids[0].virtual_host_addr +
		sizeof(wifictlhdr8023));
	sendbuf = ai->txfids[0].virtual_host_addr +
		sizeof(wifictlhdr8023) + 2 ;

	/*
	 * Firmware automatically puts 802 header on so
	 * we don't need to account for it in the length
	 */
	if (test_bit(FLAG_MIC_CAPABLE, &ai->flags) && ai->micstats.enabled &&
		(ntohs(((__be16 *)buffer)[6]) != 0x888E)) {
		MICBuffer pMic;

		if (encapsulate(ai, (etherHead *)buffer, &pMic, len - sizeof(etherHead)) != SUCCESS)
			return ERROR;

		*payloadLen = cpu_to_le16(len-sizeof(etherHead)+sizeof(pMic));
		ai->txfids[0].tx_desc.len += sizeof(pMic);
		/* copy data into airo dma buffer */
		memcpy (sendbuf, buffer, sizeof(etherHead));
		buffer += sizeof(etherHead);
		sendbuf += sizeof(etherHead);
		memcpy (sendbuf, &pMic, sizeof(pMic));
		sendbuf += sizeof(pMic);
		memcpy (sendbuf, buffer, len - sizeof(etherHead));
	} else {
		*payloadLen = cpu_to_le16(len - sizeof(etherHead));

		dev->trans_start = jiffies;

		/* copy data into airo dma buffer */
		memcpy(sendbuf, buffer, len);
	}

	memcpy_toio(ai->txfids[0].card_ram_off,
		&ai->txfids[0].tx_desc, sizeof(TxFid));

	OUT4500(ai, EVACK, 8);

	dev_kfree_skb_any(skb);
	return 1;
}
