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[IB/ipoib]: Fix unsigned comparisons to handle wraparound

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Fix handling of tx_head/tx_tail comparisons to handle wraparound.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-07-27 14:41:32 -07:00
parent abdf119b4d
commit 2181858bb8
1 changed files with 3 additions and 3 deletions
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6
drivers/infiniband/ulp/ipoib/ipoib_ib.c
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@ -81,7 +81,7 @@ void ipoib_free_ah(struct kref *kref)
unsigned long flags;
if (ah->last_send <= priv->tx_tail) {
if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
ipoib_dbg(priv, "Freeing ah %p\n", ah->ah);
ib_destroy_ah(ah->ah);
kfree(ah);
@ -355,7 +355,7 @@ static void __ipoib_reap_ah(struct net_device *dev)
spin_lock_irq(&priv->lock);
list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
if (ah->last_send <= priv->tx_tail) {
if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
list_del(&ah->list);
list_add_tail(&ah->list, &remove_list);
}
@ -486,7 +486,7 @@ int ipoib_ib_dev_stop(struct net_device *dev)
* assume the HW is wedged and just free up
* all our pending work requests.
*/
while (priv->tx_tail < priv->tx_head) {
while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
tx_req = &priv->tx_ring[priv->tx_tail &
(IPOIB_TX_RING_SIZE - 1)];
dma_unmap_single(priv->ca->dma_device,