[PATCH 74/82] usb: gadget: NCM: differentiate consumed packets from dropped packets

[Felipe Balbi]

From: Torsten Polle <tpo...@de.adit-jv.com>

dev_kfree_skb_any() is used to free packets that are dropped by the
network stack. Therefore the function should not be used for packets
that have been successfully processed by the network stack. Instead
dev_consume_skb_any() has to be used for such consumed packets.

This separation helps to identify dropped packets.

Signed-off-by: Torsten Polle <tpo...@de.adit-jv.com>
Signed-off-by: Harish Jenny K N <harish_kand...@mentor.com>
Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
---
 drivers/usb/gadget/function/f_ncm.c   | 8 ++++----
 drivers/usb/gadget/function/u_ether.c | 3 ++-
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/gadget/function/f_ncm.c 
b/drivers/usb/gadget/function/f_ncm.c
index b6771ad2485a..e8008fa35e1e 100644
--- a/drivers/usb/gadget/function/f_ncm.c
+++ b/drivers/usb/gadget/function/f_ncm.c
@@ -998,7 +998,7 @@ static struct sk_buff *package_for_tx(struct f_ncm *ncm)
        /* Merge the skbs */
        swap(skb2, ncm->skb_tx_data);
        if (ncm->skb_tx_data) {
-               dev_kfree_skb_any(ncm->skb_tx_data);
+               dev_consume_skb_any(ncm->skb_tx_data);
                ncm->skb_tx_data = NULL;
        }
 
@@ -1009,7 +1009,7 @@ static struct sk_buff *package_for_tx(struct f_ncm *ncm)
        /* Copy NTB across. */
        ntb_iter = (void *) skb_put(skb2, ncm->skb_tx_ndp->len);
        memcpy(ntb_iter, ncm->skb_tx_ndp->data, ncm->skb_tx_ndp->len);
-       dev_kfree_skb_any(ncm->skb_tx_ndp);
+       dev_consume_skb_any(ncm->skb_tx_ndp);
        ncm->skb_tx_ndp = NULL;
 
        /* Insert zero'd datagram. */
@@ -1136,7 +1136,7 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
                memset(ntb_data, 0, dgram_pad);
                ntb_data = (void *) skb_put(ncm->skb_tx_data, skb->len);
                memcpy(ntb_data, skb->data, skb->len);
-               dev_kfree_skb_any(skb);
+               dev_consume_skb_any(skb);
                skb = NULL;
 
        } else if (ncm->skb_tx_data && ncm->timer_force_tx) {
@@ -1332,7 +1332,7 @@ static int ncm_unwrap_ntb(struct gether *port,
                } while (ndp_len > 2 * (opts->dgram_item_len * 2));
        } while (ndp_index);
 
-       dev_kfree_skb_any(skb);
+       dev_consume_skb_any(skb);
 
        VDBG(port->func.config->cdev,
             "Parsed NTB with %d frames\n", dgram_counter);
diff --git a/drivers/usb/gadget/function/u_ether.c 
b/drivers/usb/gadget/function/u_ether.c
index 5aeb6d903075..f4a640216913 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -455,16 +455,17 @@ static void tx_complete(struct usb_ep *ep, struct 
usb_request *req)
                /* FALLTHROUGH */
        case -ECONNRESET:               /* unlink */
        case -ESHUTDOWN:                /* disconnect etc */
+               dev_kfree_skb_any(skb);
                break;
        case 0:
                dev->net->stats.tx_bytes += skb->len;
+               dev_consume_skb_any(skb);
        }
        dev->net->stats.tx_packets++;
 
        spin_lock(&dev->req_lock);
        list_add(&req->list, &dev->tx_reqs);
        spin_unlock(&dev->req_lock);
-       dev_kfree_skb_any(skb);
 
        atomic_dec(&dev->tx_qlen);
        if (netif_carrier_ok(dev->net))
-- 
2.10.1

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