linux-kernel - [PATCH 3.4 23/43] dm9601: fix reception of full size ethernet frames on dm9620/dm9621a

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Message-Id: <20140106223942.911720477@linuxfoundation.org>
Date:	Mon,  6 Jan 2014 14:39:40 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Peter Korsgaard <peter@...sgaard.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.4 23/43] dm9601: fix reception of full size ethernet frames on dm9620/dm9621a

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Korsgaard <peter@...sgaard.com>

commit 407900cfb54bdb2cfa228010b6697305f66b2948 upstream.

dm9620/dm9621a require room for 4 byte padding even in dm9601 (3 byte
header) mode.

Signed-off-by: Peter Korsgaard <peter@...sgaard.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/usb/dm9601.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -445,7 +445,12 @@ static int dm9601_bind(struct usbnet *de
 	dev->net->ethtool_ops = &dm9601_ethtool_ops;
 	dev->net->hard_header_len += DM_TX_OVERHEAD;
 	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
-	dev->rx_urb_size = dev->net->mtu + ETH_HLEN + DM_RX_OVERHEAD;
+
+	/* dm9620/21a require room for 4 byte padding, even in dm9601
+	 * mode, so we need +1 to be able to receive full size
+	 * ethernet frames.
+	 */
+	dev->rx_urb_size = dev->net->mtu + ETH_HLEN + DM_RX_OVERHEAD + 1;
 
 	dev->mii.dev = dev->net;
 	dev->mii.mdio_read = dm9601_mdio_read;


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