[NETPOLL]: netpoll_poll() cleanup
Restructure code slightly to improve readability:
* dereference device once
* change obvious while() loop
* let poll_napi() handle null list itself
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index f63a70b..250868f 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -139,16 +139,15 @@
return budget - work;
}
-static void poll_napi(struct netpoll *np)
+static void poll_napi(struct net_device *dev)
{
- struct netpoll_info *npinfo = np->dev->npinfo;
struct napi_struct *napi;
int budget = 16;
- list_for_each_entry(napi, &np->dev->napi_list, dev_list) {
+ list_for_each_entry(napi, &dev->napi_list, dev_list) {
if (napi->poll_owner != smp_processor_id() &&
spin_trylock(&napi->poll_lock)) {
- budget = poll_one_napi(npinfo, napi, budget);
+ budget = poll_one_napi(dev->npinfo, napi, budget);
spin_unlock(&napi->poll_lock);
if (!budget)
@@ -159,30 +158,27 @@
static void service_arp_queue(struct netpoll_info *npi)
{
- struct sk_buff *skb;
+ if (npi) {
+ struct sk_buff *skb;
- if (unlikely(!npi))
- return;
-
- skb = skb_dequeue(&npi->arp_tx);
-
- while (skb != NULL) {
- arp_reply(skb);
- skb = skb_dequeue(&npi->arp_tx);
+ while ((skb = skb_dequeue(&npi->arp_tx)))
+ arp_reply(skb);
}
}
void netpoll_poll(struct netpoll *np)
{
- if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
+ struct net_device *dev = np->dev;
+
+ if (!dev || !netif_running(dev) || !dev->poll_controller)
return;
/* Process pending work on NIC */
- np->dev->poll_controller(np->dev);
- if (!list_empty(&np->dev->napi_list))
- poll_napi(np);
+ dev->poll_controller(dev);
- service_arp_queue(np->dev->npinfo);
+ poll_napi(dev);
+
+ service_arp_queue(dev->npinfo);
zap_completion_queue();
}