luck/tmp_suning_uos_patched
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[PATCH] Spidernet stop queue when queue is full.

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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>
This commit is contained in:
Linas Vepstas 2006-10-10 16:04:00 -05:00 committed by Jeff Garzik
parent ded8028a0b
commit 313ef4b76c
1 changed files with 10 additions and 23 deletions
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33
drivers/net/spider_net.c
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@ -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);
}