tg3: Use napi_alloc_frag()

tg3_alloc_rx_data() uses netdev_alloc_frag() for skb allocation. All
callers of tg3_alloc_rx_data() either hold tp->lock (which is held with
BH disabled) or run in NAPI context.

Use napi_alloc_frag() for skb allocations.

Cc: Siva Reddy Kallam <[e-mail]>
Cc: Prashant Sreedharan <[e-mail]>
Cc: Michael Chan <[e-mail]>
Signed-off-by: Sebastian Andrzej Siewior <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/broadcom/tg3.c

···
 	skb_size = SKB_DATA_ALIGN(data_size + TG3_RX_OFFSET(tp)) +
 		   SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 	if (skb_size <= PAGE_SIZE) {
-		data = netdev_alloc_frag(skb_size);
+		data = napi_alloc_frag(skb_size);
 		*frag_size = skb_size;
 	} else {
 		data = kmalloc(skb_size, GFP_ATOMIC);