staging: ozwpan: Revert last changes

This patch reverts the changes made by the following patches:

commit id: edea341b0477ce5d53f7341f8b8cf8c91ad54ecf
[PATCH 1/4] ozwpan: replace alloc_skb with dev_alloc_skb in ozpd.c

commit id: b59983f525396a47cf8b28c13bbd5d5ff57859b8
[PATCH 2/4] ozwpan: replace alloc_skb with dev_alloc_skb in ozproto.c

commit id: 4422a6c14d0d0bfe519ec487693f1787f64b0b90
[PATCH 3/4] ozwpan: replace kfree_skb with dev_kfree_skb in ozpd.c

commit id: e241a8b61671b487e1a04b455dbd32ab965250ef
[PATCH 4/4] ozwpan: replace kfree_skb with dev_kfree_skb in ozproto.c

The reason of this revert is that dev_alloc_skb() is not defined
to be used in the allocation of socket buffers on the transmit path
but on the receive path.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ozwpan/ozpd.c

@@ -207,7 +207,7 @@ void oz_pd_destroy(struct oz_pd *pd)
 		f = container_of(e, struct oz_tx_frame, link);
 		e = e->next;
 		if (f->skb != NULL)
-			dev_kfree_skb(f->skb);
+			kfree_skb(f->skb);
 		oz_retire_frame(pd, f);
 	}
 	oz_elt_buf_term(&pd->elt_buff);
@@ -463,7 +463,7 @@ static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f)
 	/* Allocate skb with enough space for the lower layers as well
 	 * as the space we need.
 	 */
-	skb = dev_alloc_skb(f->total_size + OZ_ALLOCATED_SPACE(dev));
+	skb = alloc_skb(f->total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 	if (skb == NULL)
 		return NULL;
 	/* Reserve the head room for lower layers.
@@ -491,7 +491,7 @@ static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f)
 	}
 	return skb;
 fail:
-	dev_kfree_skb(skb);
+	kfree_skb(skb);
 	return NULL;
 }
 /*------------------------------------------------------------------------------
@@ -553,7 +553,7 @@ static int oz_send_next_queued_frame(struct oz_pd *pd, int more_data)
 						pd->nb_queued_isoc_frames);
 			return 0;
 		} else {
-			dev_kfree_skb(skb);
+			kfree_skb(skb);
 			oz_trace2(OZ_TRACE_TX_FRAMES, "Dropping ISOC Frame>\n");
 			oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, NULL, 0);
 			return -1;
@@ -633,7 +633,7 @@ static int oz_send_isoc_frame(struct oz_pd *pd)
 		pd->max_tx_size, &list);
 	if (list.next == &list)
 		return 0;
-	skb = dev_alloc_skb(total_size + OZ_ALLOCATED_SPACE(dev));
+	skb = alloc_skb(total_size + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 	if (skb == NULL) {
 		oz_trace("Cannot alloc skb\n");
 		oz_elt_info_free_chain(&pd->elt_buff, &list);
@@ -645,7 +645,7 @@ static int oz_send_isoc_frame(struct oz_pd *pd)
 	skb->protocol = htons(OZ_ETHERTYPE);
 	if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
 		dev->dev_addr, skb->len) < 0) {
-		dev_kfree_skb(skb);
+		kfree_skb(skb);
 		return -1;
 	}
 	oz_hdr = (struct oz_hdr *)skb_put(skb, total_size);
@@ -744,7 +744,7 @@ int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num)
  */
 static void oz_isoc_stream_free(struct oz_isoc_stream *st)
 {
-	dev_kfree_skb(st->skb);
+	kfree_skb(st->skb);
 	kfree(st);
 }
 /*------------------------------------------------------------------------------
@@ -797,7 +797,8 @@ int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, const u8 *data, int len)
 		return 0;
 	if (!skb) {
 		/* Allocate enough space for max size frame. */
-		skb = dev_alloc_skb(pd->max_tx_size + OZ_ALLOCATED_SPACE(dev));
+		skb = alloc_skb(pd->max_tx_size + OZ_ALLOCATED_SPACE(dev),
+				GFP_ATOMIC);
 		if (skb == NULL)
 			return 0;
 		/* Reserve the head room for lower layers. */
@@ -880,7 +881,7 @@ int oz_send_isoc_unit(struct oz_pd *pd, u8 ep_num, const u8 *data, int len)
 		}
 
 out:	oz_event_log(OZ_EVT_TX_ISOC_DROP, 0, 0, NULL, 0);
-	dev_kfree_skb(skb);
+	kfree_skb(skb);
 	return -1;
 
 	}

drivers/staging/ozwpan/ozproto.c

@@ -97,7 +97,7 @@ static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
 	struct oz_elt_connect_rsp *body;
 	int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
 			sizeof(struct oz_elt_connect_rsp);
-	skb = dev_alloc_skb(sz + OZ_ALLOCATED_SPACE(dev));
+	skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 	if (skb == NULL)
 		return;
 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
@@ -110,7 +110,7 @@ static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
 	/* Fill in device header */
 	if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
 			dev->dev_addr, skb->len) < 0) {
-		dev_kfree_skb(skb);
+		kfree_skb(skb);
 		return;
 	}
 	oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);