[PATCH] Spidernet stop queue when queue is full.

This patch adds a call to netif_stop_queue() when there is
no more room for more packets on the transmit queue.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 2f54cdd..05bdd0b 100644 (file)
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -823,39 +823,25 @@ spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
        struct spider_net_descr_chain *chain = &card->tx_chain;
        struct spider_net_descr *descr = chain->head;
        unsigned long flags;
-       int result;
 
        spin_lock_irqsave(&chain->lock, flags);
 
        spider_net_release_tx_chain(card, 0);
 
-       if (chain->head->next == chain->tail->prev) {
-               card->netdev_stats.tx_dropped++;
-               result = NETDEV_TX_LOCKED;
-               goto out;
-       }
+       if ((chain->head->next == chain->tail->prev) ||
+          (spider_net_get_descr_status(descr) != SPIDER_NET_DESCR_NOT_IN_USE) ||
+          (spider_net_prepare_tx_descr(card, skb) != 0)) {
 
-       if (spider_net_get_descr_status(descr) != SPIDER_NET_DESCR_NOT_IN_USE) {
                card->netdev_stats.tx_dropped++;
-               result = NETDEV_TX_LOCKED;
-               goto out;
+               spin_unlock_irqrestore(&chain->lock, flags);
+               netif_stop_queue(netdev);
+               return NETDEV_TX_BUSY;
        }
 
-       if (spider_net_prepare_tx_descr(card, skb) != 0) {
-               card->netdev_stats.tx_dropped++;
-               result = NETDEV_TX_BUSY;
-               goto out;
-       }
-
-       result = NETDEV_TX_OK;
-
        spider_net_kick_tx_dma(card);
        card->tx_chain.head = card->tx_chain.head->next;
-
-out:
        spin_unlock_irqrestore(&chain->lock, flags);
-       netif_wake_queue(netdev);
-       return result;
+       return NETDEV_TX_OK;
 }
 
 /**
@@ -874,9 +860,10 @@ spider_net_cleanup_tx_ring(struct spider_net_card *card)
        spin_lock_irqsave(&card->tx_chain.lock, flags);
 
        if ((spider_net_release_tx_chain(card, 0) != 0) &&
-           (card->netdev->flags & IFF_UP))
+           (card->netdev->flags & IFF_UP)) {
                spider_net_kick_tx_dma(card);
-
+               netif_wake_queue(card->netdev);
+       }
        spin_unlock_irqrestore(&card->tx_chain.lock, flags);
 }