diff options
| author | Elina Pasheva <epasheva@sierrawireless.com> | 2010-04-06 14:23:07 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-06 19:50:22 -0700 |
| commit | b4d562e3c3553ac58c7120555c4e4aefbb090a2a (patch) | |
| tree | 57399d164d3882f0f19080c0cd0014d039af6109 | |
| parent | 17a328ca8c04cf88be9a9ef1cb74f359c59f1802 (diff) | |
| download | linux-b4d562e3c3553ac58c7120555c4e4aefbb090a2a.tar.bz2 | |
NET: usb: Adding URB_ZERO_PACKET flag to usbnet.c
This patch adds setting of the urb transfer flag URB_ZERO_PACKET before
submitting an urb for drivers that have requested it (by advertising flag
FLAG_SEND_ZLP).
The modification is in usbnet.c function usbnet_start_xmit().
This patch only adds the zero length flag.
A subsequent patch will address the buggy code we found when devices do not
advertise FLAG_SEND_ZLP in which case there is a possibility of transferring
packets with non-deterministic length.
This patch has been tested on kernel-2.6.34-rc3.
This patch has been checked against net-2.6 tree.
Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com>
Signed-off-by: Rory Filer <rfiler@sierrawireless.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/usb/usbnet.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 17b6a62d206e..c0f64392627c 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1068,12 +1068,15 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, * NOTE: strictly conforming cdc-ether devices should expect * the ZLP here, but ignore the one-byte packet. */ - if (!(info->flags & FLAG_SEND_ZLP) && (length % dev->maxpacket) == 0) { - urb->transfer_buffer_length++; - if (skb_tailroom(skb)) { - skb->data[skb->len] = 0; - __skb_put(skb, 1); - } + if (length % dev->maxpacket == 0) { + if (!(info->flags & FLAG_SEND_ZLP)) { + urb->transfer_buffer_length++; + if (skb_tailroom(skb)) { + skb->data[skb->len] = 0; + __skb_put(skb, 1); + } + } else + urb->transfer_flags |= URB_ZERO_PACKET; } spin_lock_irqsave(&dev->txq.lock, flags); |