+}
+
+/**
+ * spider_net_resync_head_ptr - Advance head ptr past empty descrs
+ *
+ * If the driver fails to keep up and empty the queue, then the
+ * hardware wil run out of room to put incoming packets. This
+ * will cause the hardware to skip descrs that are full (instead
+ * of halting/retrying). Thus, once the driver runs, it wil need
+ * to "catch up" to where the hardware chain pointer is at.
+ */
+static void spider_net_resync_head_ptr(struct spider_net_card *card)
+{
+ unsigned long flags;
+ struct spider_net_descr_chain *chain = &card->rx_chain;
+ struct spider_net_descr *descr;
+ int i, status;
+
+ /* Advance head pointer past any empty descrs */
+ descr = chain->head;
+ status = spider_net_get_descr_status(descr->hwdescr);
+
+ if (status == SPIDER_NET_DESCR_NOT_IN_USE)
+ return;
+
+ spin_lock_irqsave(&chain->lock, flags);
+
+ descr = chain->head;
+ status = spider_net_get_descr_status(descr->hwdescr);
+ for (i=0; i<chain->num_desc; i++) {
+ if (status != SPIDER_NET_DESCR_CARDOWNED) break;
+ descr = descr->next;
+ status = spider_net_get_descr_status(descr->hwdescr);
+ }
+ chain->head = descr;
+
+ spin_unlock_irqrestore(&chain->lock, flags);
+}
+
+static int spider_net_resync_tail_ptr(struct spider_net_card *card)
+{
+ struct spider_net_descr_chain *chain = &card->rx_chain;
+ struct spider_net_descr *descr;
+ int i, status;
+
+ /* Advance tail pointer past any empty and reaped descrs */
+ descr = chain->tail;
+ status = spider_net_get_descr_status(descr->hwdescr);
+
+ for (i=0; i<chain->num_desc; i++) {
+ if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
+ (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
+ descr = descr->next;
+ status = spider_net_get_descr_status(descr->hwdescr);
+ }
+ chain->tail = descr;
+
+ if ((i == chain->num_desc) || (i == 0))
+ return 1;
+ return 0;
+}
+