1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/util.c b/drivers/net/wireless/mwifiex/util.c
index 6b399976d6c8..2864c74bdb6f 100644
--- a/drivers/net/wireless/mwifiex/util.c
+++ b/drivers/net/wireless/mwifiex/util.c
@@ -167,6 +167,28 @@ int mwifiex_recv_packet(struct mwifiex_adapter *adapter, struct sk_buff *skb)
         skb->dev = priv->netdev;
         skb->protocol = eth_type_trans(skb, priv->netdev);
         skb->ip_summed = CHECKSUM_NONE;
+
+        /* This is required only in case of 11n and USB as we alloc
+         * a buffer of 4K only if its 11N (to be able to receive 4K
+         * AMSDU packets). In case of SD we allocate buffers based
+         * on the size of packet and hence this is not needed.
+         *
+         * Modifying the truesize here as our allocation for each
+         * skb is 4K but we only receive 2K packets and this cause
+         * the kernel to start dropping packets in case where
+         * application has allocated buffer based on 2K size i.e.
+         * if there a 64K packet received (in IP fragments and
+         * application allocates 64K to receive this packet but
+         * this packet would almost double up because we allocate
+         * each 1.5K fragment in 4K and pass it up. As soon as the
+         * 64K limit hits kernel will start to drop rest of the
+         * fragments. Currently we fail the Filesndl-ht.scr script
+         * for UDP, hence this fix
+         */
+        if ((adapter->iface_type == MWIFIEX_USB) &&
+            (skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
+                skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
+
         priv->stats.rx_bytes += skb->len;
         priv->stats.rx_packets++;
         if (in_interrupt())