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usbnet: Zero padding byte if there is tail room in skb 

Usbnet adds a padding byte if a 0 byte USB packet would be sent. Zero
padding byte if there is tail room in skb.

Signed-of-by: Peter Korsgaard <jacmet@sunsite.dk>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>

Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Peter Korsgaard 2007-06-27 08:48:15 +02:00 committed by Jeff Garzik
parent 23de559b8d
commit 3e323f3e86
1 changed files with 6 additions and 3 deletions
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9
drivers/net/usb/usbnet.c
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@ -953,11 +953,14 @@ static int usbnet_start_xmit (struct sk_buff *skb, struct net_device *net)
/* don't assume the hardware handles USB_ZERO_PACKET
* NOTE: strictly conforming cdc-ether devices should expect
* the ZLP here, but ignore the one-byte packet.
*
* FIXME zero that byte, if it doesn't require a new skb.
*/
if ((length % dev->maxpacket) == 0)
if ((length % dev->maxpacket) == 0) {
urb->transfer_buffer_length++;
if (skb_tailroom(skb)) {
skb->data[skb->len] = 0;
__skb_put(skb, 1);
}
}
spin_lock_irqsave (&dev->txq.lock, flags);