netdev - [PATCH] Revert "usbnet: drop unneeded check for NULL"

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Date:	Wed,  5 Sep 2012 21:22:32 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	davem@...emloft.net, netdev@...r.kernel.org
Cc:	Oliver Neukum <oliver@...kum.org>, Oliver Neukum <oneukum@...e.de>
Subject: [PATCH] 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: Oliver Neukum <oneukum@...e.de>
---
 drivers/net/usb/usbnet.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 5234d20..8531c1c 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -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
-- 
1.7.7

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