Commit f6fe569f authored by Oliver Neukum's avatar Oliver Neukum Committed by David S. Miller
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Revert "usbnet: drop unneeded check for NULL"

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: default avatarOliver Neukum <>
Signed-off-by: default avatarDavid S. Miller <>
parent d23ff701
......@@ -1092,7 +1092,8 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
unsigned long flags;
int retval;
if (skb)
// some devices want funky USB-level framing, for
// win32 driver (usually) and/or hardware quirks
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