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USBNET: fix handling padding packet

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Commit 638c5115a7949(USBNET: support DMA SG) introduces DMA SG
if the usb host controller is capable of building packet from
discontinuous buffers, but missed handling padding packet when
building DMA SG.

This patch attachs the pre-allocated padding packet at the
end of the sg list, so padding packet can be sent to device
if drivers require that.

Reported-by: David Laight <David.Laight@aculab.com>
Acked-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ming Lei 2013-09-23 20:59:35 +08:00 • committed by David S. Miller
commit 60e453a940
2 changed files with 22 additions and 6 deletions
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include/linux/usb/usbnet.h
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@ -42,6 +42,7 @@ struct usbnet {
struct usb_host_endpoint *status;
unsigned maxpacket;
struct timer_list delay;
const char *padding_pkt;
/* protocol/interface state */
struct net_device *net;