1 files changed, 44 insertions, 12 deletions

diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c
index c6867f926cff..e80219877730 100644
--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -1,5 +1,5 @@
 /*
- * Davicom DM9601 USB 1.1 10/100Mbps ethernet devices
+ * Davicom DM96xx USB 10/100Mbps ethernet devices
  *
  * Peter Korsgaard <jacmet@sunsite.dk>
  *
@@ -364,7 +364,12 @@ static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
         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;
@@ -468,7 +473,7 @@ static int dm9601_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 static struct sk_buff *dm9601_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
                                        gfp_t flags)
 {
-        int len;
+        int len, pad;
 
         /* format:
            b1: packet length low
@@ -476,12 +481,23 @@ static struct sk_buff *dm9601_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
            b3..n: packet data
         */
 
-        len = skb->len;
+        len = skb->len + DM_TX_OVERHEAD;
 
-        if (skb_headroom(skb) < DM_TX_OVERHEAD) {
+        /* workaround for dm962x errata with tx fifo getting out of
+         * sync if a USB bulk transfer retry happens right after a
+         * packet with odd / maxpacket length by adding up to 3 bytes
+         * padding.
+         */
+        while ((len & 1) || !(len % dev->maxpacket))
+                len++;
+
+        len -= DM_TX_OVERHEAD; /* hw header doesn't count as part of length */
+        pad = len - skb->len;
+
+        if (skb_headroom(skb) < DM_TX_OVERHEAD || skb_tailroom(skb) < pad) {
                 struct sk_buff *skb2;
 
-                skb2 = skb_copy_expand(skb, DM_TX_OVERHEAD, 0, flags);
+                skb2 = skb_copy_expand(skb, DM_TX_OVERHEAD, pad, flags);
                 dev_kfree_skb_any(skb);
                 skb = skb2;
                 if (!skb)
@@ -490,10 +506,10 @@ static struct sk_buff *dm9601_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
 
         __skb_push(skb, DM_TX_OVERHEAD);
 
-        /* usbnet adds padding if length is a multiple of packet size
-           if so, adjust length value in header */
-        if ((skb->len % dev->maxpacket) == 0)
-                len++;
+        if (pad) {
+                memset(skb->data + skb->len, 0, pad);
+                __skb_put(skb, pad);
+        }
 
         skb->data[0] = len;
         skb->data[1] = len >> 8;
@@ -543,7 +559,7 @@ static int dm9601_link_reset(struct usbnet *dev)
 }
 
 static const struct driver_info dm9601_info = {
-        .description    = "Davicom DM9601 USB Ethernet",
+        .description    = "Davicom DM96xx USB 10/100 Ethernet",
         .flags          = FLAG_ETHER | FLAG_LINK_INTR,
         .bind           = dm9601_bind,
         .rx_fixup       = dm9601_rx_fixup,
@@ -594,6 +610,22 @@ static const struct usb_device_id products[] = {
          USB_DEVICE(0x0a46, 0x9620),    /* DM9620 USB to Fast Ethernet Adapter */
          .driver_info = (unsigned long)&dm9601_info,
          },
+        {
+         USB_DEVICE(0x0a46, 0x9621),    /* DM9621A USB to Fast Ethernet Adapter */
+         .driver_info = (unsigned long)&dm9601_info,
+        },
+        {
+         USB_DEVICE(0x0a46, 0x9622),    /* DM9622 USB to Fast Ethernet Adapter */
+         .driver_info = (unsigned long)&dm9601_info,
+        },
+        {
+         USB_DEVICE(0x0a46, 0x0269),    /* DM962OA USB to Fast Ethernet Adapter */
+         .driver_info = (unsigned long)&dm9601_info,
+        },
+        {
+         USB_DEVICE(0x0a46, 0x1269),    /* DM9621A USB to Fast Ethernet Adapter */
+         .driver_info = (unsigned long)&dm9601_info,
+        },
         {},                     // END
 };
 
@@ -612,5 +644,5 @@ static struct usb_driver dm9601_driver = {
 module_usb_driver(dm9601_driver);
 
 MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
-MODULE_DESCRIPTION("Davicom DM9601 USB 1.1 ethernet devices");
+MODULE_DESCRIPTION("Davicom DM96xx USB 10/100 ethernet devices");
 MODULE_LICENSE("GPL");