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IPoIB/cm: spin_lock_irqsave() -> spin_lock_irq() replacements
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There are quite a few places in ipoib_cm.c where we know IRQs are
enabled because we do something that sleeps in the same function, so
we can convert several occurrences of spin_lock_irqsave() to a plain
spin_lock_irq().  This cleans up the source a little and makes the
code smaller too:

add/remove: 0/0 grow/shrink: 1/5 up/down: 3/-51 (-48)
function                                     old     new   delta
ipoib_cm_tx_reap                             403     406      +3
ipoib_cm_stale_task                          146     145      -1
ipoib_cm_dev_stop                            173     172      -1
ipoib_cm_tx_handler                          964     956      -8
ipoib_cm_rx_handler                          956     937     -19
ipoib_cm_skb_reap                            212     190     -22

Signed-off-by: Roland Dreier <rolandd@cisco.com>
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Roland Dreier committed Apr 25, 2007
1 parent de493d4 commit 37aebbd
Showing 1 changed file with 24 additions and 32 deletions.
56 changes: 24 additions & 32 deletions drivers/infiniband/ulp/ipoib/ipoib_cm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -228,7 +228,6 @@ static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *even
struct net_device *dev = cm_id->context;
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_rx *p;
unsigned long flags;
unsigned psn;
int ret;

Expand Down Expand Up @@ -257,9 +256,9 @@ static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *even

cm_id->context = p;
p->jiffies = jiffies;
spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
list_add(&p->list, &priv->cm.passive_ids);
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);
queue_delayed_work(ipoib_workqueue,
&priv->cm.stale_task, IPOIB_CM_RX_DELAY);
return 0;
Expand All @@ -277,7 +276,6 @@ static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
{
struct ipoib_cm_rx *p;
struct ipoib_dev_priv *priv;
unsigned long flags;
int ret;

switch (event->event) {
Expand All @@ -290,14 +288,14 @@ static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
case IB_CM_REJ_RECEIVED:
p = cm_id->context;
priv = netdev_priv(p->dev);
spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
if (list_empty(&p->list))
ret = 0; /* Connection is going away already. */
else {
list_del_init(&p->list);
ret = -ECONNRESET;
}
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);
if (ret) {
ib_destroy_qp(p->qp);
kfree(p);
Expand Down Expand Up @@ -612,23 +610,22 @@ void ipoib_cm_dev_stop(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_cm_rx *p;
unsigned long flags;

if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
return;

ib_destroy_cm_id(priv->cm.id);
spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
while (!list_empty(&priv->cm.passive_ids)) {
p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
list_del_init(&p->list);
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);
ib_destroy_cm_id(p->id);
ib_destroy_qp(p->qp);
kfree(p);
spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
}
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);

cancel_delayed_work(&priv->cm.stale_task);
}
Expand All @@ -642,7 +639,6 @@ static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *even
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
struct sk_buff *skb;
unsigned long flags;

p->mtu = be32_to_cpu(data->mtu);

Expand Down Expand Up @@ -680,12 +676,12 @@ static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *even

skb_queue_head_init(&skqueue);

spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
if (p->neigh)
while ((skb = __skb_dequeue(&p->neigh->queue)))
__skb_queue_tail(&skqueue, skb);
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);

while ((skb = __skb_dequeue(&skqueue))) {
skb->dev = p->dev;
Expand Down Expand Up @@ -895,7 +891,6 @@ static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
struct net_device *dev = priv->dev;
struct ipoib_neigh *neigh;
unsigned long flags;
int ret;

switch (event->event) {
Expand All @@ -914,7 +909,7 @@ static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
case IB_CM_REJ_RECEIVED:
case IB_CM_TIMEWAIT_EXIT:
ipoib_dbg(priv, "CM error %d.\n", event->event);
spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
neigh = tx->neigh;

Expand All @@ -934,7 +929,7 @@ static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
}

spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
spin_unlock_irq(&priv->tx_lock);
break;
default:
break;
Expand Down Expand Up @@ -1023,21 +1018,20 @@ static void ipoib_cm_tx_reap(struct work_struct *work)
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.reap_task);
struct ipoib_cm_tx *p;
unsigned long flags;

spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
while (!list_empty(&priv->cm.reap_list)) {
p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
list_del(&p->list);
spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
spin_unlock_irq(&priv->tx_lock);
ipoib_cm_tx_destroy(p);
spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
}
spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
spin_unlock_irq(&priv->tx_lock);
}

static void ipoib_cm_skb_reap(struct work_struct *work)
Expand All @@ -1046,27 +1040,26 @@ static void ipoib_cm_skb_reap(struct work_struct *work)
cm.skb_task);
struct net_device *dev = priv->dev;
struct sk_buff *skb;
unsigned long flags;

unsigned mtu = priv->mcast_mtu;

spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
spin_unlock_irq(&priv->tx_lock);
if (skb->protocol == htons(ETH_P_IP))
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
else if (skb->protocol == htons(ETH_P_IPV6))
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
#endif
dev_kfree_skb_any(skb);
spin_lock_irqsave(&priv->tx_lock, flags);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
}
spin_unlock(&priv->lock);
spin_unlock_irqrestore(&priv->tx_lock, flags);
spin_unlock_irq(&priv->tx_lock);
}

void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
Expand All @@ -1088,23 +1081,22 @@ static void ipoib_cm_stale_task(struct work_struct *work)
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
cm.stale_task.work);
struct ipoib_cm_rx *p;
unsigned long flags;

spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
while (!list_empty(&priv->cm.passive_ids)) {
/* List if sorted by LRU, start from tail,
* stop when we see a recently used entry */
p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
break;
list_del_init(&p->list);
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);
ib_destroy_cm_id(p->id);
ib_destroy_qp(p->qp);
kfree(p);
spin_lock_irqsave(&priv->lock, flags);
spin_lock_irq(&priv->lock);
}
spin_unlock_irqrestore(&priv->lock, flags);
spin_unlock_irq(&priv->lock);
}


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