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Revert "usbnet: drop unneeded check for NULL"

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This reverts commit 5d65878d7031b6c39054b282faceff406bb2fda9.
The upper layers call usbnet_start_xmit() with a valid skb.
However cdc_ncm abuses this method by calling it with NULL
to trigger IO for the aggregated private skb holding erlier
packets. Until cdc_ncm is fixed, the check for NULL must
be reintroduced.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oliver Neukum 2012-09-05 21:22:32 +02:00 committed by David S. Miller
parent d23ff70164
commit f6fe569fe0
1 changed files with 2 additions and 1 deletions
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3
drivers/net/usb/usbnet.c
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@ -1092,7 +1092,8 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
unsigned long flags;
int retval;
skb_tx_timestamp(skb);
if (skb)
skb_tx_timestamp(skb);
// some devices want funky USB-level framing, for
// win32 driver (usually) and/or hardware quirks