From 52103b70e13ae1381020b5a9fa15824a9b35baeb Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Thu, 19 May 2016 22:56:48 -0700
Subject: Revert "net: pegasus: remove dead coding"

This reverts commit e00be9e4d0ffcc0121606229f0aa4b246d6881d7.

It causes warnings and has several problems.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index 1903d2e..36cd7f0 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -470,8 +470,61 @@ static void read_bulk_callback(struct urb *urb)
 		return;
 	default:
 		netif_dbg(pegasus, rx_err, net, "RX status %d\n", status);
+		goto goon;
 	}
 
+	if (!count || count < 4)
+		goto goon;
+
+	rx_status = buf[count - 2];
+	if (rx_status & 0x1e) {
+		netif_dbg(pegasus, rx_err, net,
+			  "RX packet error %x\n", rx_status);
+		pegasus->stats.rx_errors++;
+		if (rx_status & 0x06)	/* long or runt	*/
+			pegasus->stats.rx_length_errors++;
+		if (rx_status & 0x08)
+			pegasus->stats.rx_crc_errors++;
+		if (rx_status & 0x10)	/* extra bits	*/
+			pegasus->stats.rx_frame_errors++;
+		goto goon;
+	}
+	if (pegasus->chip == 0x8513) {
+		pkt_len = le32_to_cpu(*(__le32 *)urb->transfer_buffer);
+		pkt_len &= 0x0fff;
+		pegasus->rx_skb->data += 2;
+	} else {
+		pkt_len = buf[count - 3] << 8;
+		pkt_len += buf[count - 4];
+		pkt_len &= 0xfff;
+		pkt_len -= 4;
+	}
+
+	/*
+	 * If the packet is unreasonably long, quietly drop it rather than
+	 * kernel panicing by calling skb_put.
+	 */
+	if (pkt_len > PEGASUS_MTU)
+		goto goon;
+
+	/*
+	 * at this point we are sure pegasus->rx_skb != NULL
+	 * so we go ahead and pass up the packet.
+	 */
+	skb_put(pegasus->rx_skb, pkt_len);
+	pegasus->rx_skb->protocol = eth_type_trans(pegasus->rx_skb, net);
+	netif_rx(pegasus->rx_skb);
+	pegasus->stats.rx_packets++;
+	pegasus->stats.rx_bytes += pkt_len;
+
+	if (pegasus->flags & PEGASUS_UNPLUG)
+		return;
+
+	pegasus->rx_skb = __netdev_alloc_skb_ip_align(pegasus->net, PEGASUS_MTU,
+						      GFP_ATOMIC);
+
+	if (pegasus->rx_skb == NULL)
+		goto tl_sched;
 goon:
 	usb_fill_bulk_urb(pegasus->rx_urb, pegasus->usb,
 			  usb_rcvbulkpipe(pegasus->usb, 1),
-- 
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