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p54: fix queue stall due to underrun 

Larry Finger discovered a weird behavior under load.
In essence, the queue's length count under runs,
which in turn renders the associated ac queue unusable.

Reported-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2009-07-06 15:18:13 +02:00 committed by John W. Linville
parent 6d541a684d
commit 2ffa5fede3
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireless/p54/txrx.c
View File

@ -199,7 +199,7 @@ static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
queue = &priv->tx_stats[p54_queue];
spin_lock_irqsave(&priv->tx_stats_lock, flags);
if (unlikely(queue->len > queue->limit && IS_QOS_QUEUE(p54_queue))) {
if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) {
spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
return -ENOSPC;
}
@ -222,8 +222,11 @@ static void p54_tx_qos_accounting_free(struct p54_common *priv,
if (skb && IS_DATA_FRAME(skb)) {
struct p54_hdr *hdr = (void *) skb->data;
struct p54_tx_data *data = (void *) hdr->data;
unsigned long flags;
spin_lock_irqsave(&priv->tx_stats_lock, flags);
priv->tx_stats[data->hw_queue].len--;
spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
}
p54_wake_queues(priv);
}
@ -462,7 +465,6 @@ static void p54_rx_eeprom_readback(struct p54_common *priv,
priv->eeprom = NULL;
tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
p54_tx_qos_accounting_free(priv, tmp);
dev_kfree_skb_any(tmp);
complete(&priv->eeprom_comp);
}
@ -489,7 +491,6 @@ static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
p54_tx_qos_accounting_free(priv, tmp);
dev_kfree_skb_any(tmp);
}