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 void isdn_net_tx_timeout(struct net_device * ndev)
{
	isdn_net_local *lp = netdev_priv(ndev);

	printk(KERN_WARNING "isdn_tx_timeout dev %s dialstate %d\n", ndev->name, lp->dialstate);
	if (!lp->dialstate){
		lp->stats.tx_errors++;
                /*
		 * There is a certain probability that this currently
		 * works at all because if we always wake up the interface,
		 * then upper layer will try to send the next packet
		 * immediately. And then, the old clean_up logic in the
		 * driver will hopefully continue to work as it used to do.
		 *
		 * This is rather primitive right know, we better should
		 * clean internal queues here, in particular for multilink and
		 * ppp, and reset HL driver's channel, too.   --HE
		 *
		 * actually, this may not matter at all, because ISDN hardware
		 * should not see transmitter hangs at all IMO
		 * changed KERN_DEBUG to KERN_WARNING to find out if this is 
		 * ever called   --KG
		 */
	}
	ndev->trans_start = jiffies;
	netif_wake_queue(ndev);
}

static void isdn_net_tx_timeout(struct net_device * ndev)
{
	isdn_net_local *lp = netdev_priv(ndev);

	printk(KERN_WARNING "isdn_tx_timeout dev %s dialstate %d\n", ndev->name, lp->dialstate);
	if (!lp->dialstate){
		lp->stats.tx_errors++;
                /*
		 * There is a certain probability that this currently
		 * works at all because if we always wake up the interface,
		 * then upper layer will try to send the next packet
		 * immediately. And then, the old clean_up logic in the
		 * driver will hopefully continue to work as it used to do.
		 *
		 * This is rather primitive right know, we better should
		 * clean internal queues here, in particular for multilink and
		 * ppp, and reset HL driver's channel, too.   --HE
		 *
		 * actually, this may not matter at all, because ISDN hardware
		 * should not see transmitter hangs at all IMO
		 * changed KERN_DEBUG to KERN_WARNING to find out if this is 
		 * ever called   --KG
		 */
	}
	ndev->trans_start = jiffies;
	netif_wake_queue(ndev);
}
