From eb85569fe2d06c2fbf4de7b66c263ca095b397aa Mon Sep 17 00:00:00 2001 From: Emil Goode Date: Thu, 13 Feb 2014 17:50:19 +0100 Subject: usbnet: remove generic hard_header_len check This patch removes a generic hard_header_len check from the usbnet module that is causing dropped packages under certain circumstances for devices that send rx packets that cross urb boundaries. One example is the AX88772B which occasionally send rx packets that cross urb boundaries where the remaining partial packet is sent with no hardware header. When the buffer with a partial packet is of less number of octets than the value of hard_header_len the buffer is discarded by the usbnet module. With AX88772B this can be reproduced by using ping with a packet size between 1965-1976. The bug has been reported here: https://bugzilla.kernel.org/show_bug.cgi?id=29082 This patch introduces the following changes: - Removes the generic hard_header_len check in the rx_complete function in the usbnet module. - Introduces a ETH_HLEN check for skbs that are not cloned from within a rx_fixup callback. - For safety a hard_header_len check is added to each rx_fixup callback function that could be affected by this change. These extra checks could possibly be removed by someone who has the hardware to test. - Removes a call to dev_kfree_skb_any() and instead utilizes the dev->done list to queue skbs for cleanup. The changes place full responsibility on the rx_fixup callback functions that clone skbs to only pass valid skbs to the usbnet_skb_return function. Signed-off-by: Emil Goode Reported-by: Igor Gnatenko Signed-off-by: David S. Miller --- drivers/net/usb/smsc95xx.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/net/usb/smsc95xx.c') diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index 8dd54a0f7b29..424db65e4396 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -1723,6 +1723,10 @@ static void smsc95xx_rx_csum_offload(struct sk_buff *skb) static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb) { + /* This check is no longer done by usbnet */ + if (skb->len < dev->net->hard_header_len) + return 0; + while (skb->len > 0) { u32 header, align_count; struct sk_buff *ax_skb; -- cgit v1.2.3