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[SHAPER]: Switch to spinlocks.

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Dave, you were right and the sleeping locks in shaper were
broken. Markus Kanet noticed this and also tested the patch below that
switches locking to spinlocks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2005-07-05 15:03:46 -07:00 committed by David S. Miller
parent 2f36895aa7
commit bc971dee6e
2 changed files with 17 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/net/shaper.c
View File

@ -135,10 +135,8 @@ static int shaper_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct shaper *shaper = dev->priv;
struct sk_buff *ptr;
if (down_trylock(&shaper->sem))
return -1;
spin_lock(&shaper->lock);
ptr=shaper->sendq.prev;
/*
@ -232,7 +230,7 @@ static int shaper_start_xmit(struct sk_buff *skb, struct net_device *dev)
shaper->stats.collisions++;
}
shaper_kick(shaper);
up(&shaper->sem);
spin_unlock(&shaper->lock);
return 0;
}
@ -271,11 +269,9 @@ static void shaper_timer(unsigned long data)
{
struct shaper *shaper = (struct shaper *)data;
if (!down_trylock(&shaper->sem)) {
shaper_kick(shaper);
up(&shaper->sem);
} else
mod_timer(&shaper->timer, jiffies);
spin_lock(&shaper->lock);
shaper_kick(shaper);
spin_unlock(&shaper->lock);
}
/*
@ -331,21 +327,6 @@ static void shaper_kick(struct shaper *shaper)
}
/*
* Flush the shaper queues on a closedown
*/
static void shaper_flush(struct shaper *shaper)
{
struct sk_buff *skb;
down(&shaper->sem);
while((skb=skb_dequeue(&shaper->sendq))!=NULL)
dev_kfree_skb(skb);
shaper_kick(shaper);
up(&shaper->sem);
}
/*
* Bring the interface up. We just disallow this until a
* bind.
@ -375,7 +356,15 @@ static int shaper_open(struct net_device *dev)
static int shaper_close(struct net_device *dev)
{
struct shaper *shaper=dev->priv;
shaper_flush(shaper);
struct sk_buff *skb;
while ((skb = skb_dequeue(&shaper->sendq)) != NULL)
dev_kfree_skb(skb);
spin_lock_bh(&shaper->lock);
shaper_kick(shaper);
spin_unlock_bh(&shaper->lock);
del_timer_sync(&shaper->timer);
return 0;
}
@ -576,6 +565,7 @@ static void shaper_init_priv(struct net_device *dev)
init_timer(&sh->timer);
sh->timer.function=shaper_timer;
sh->timer.data=(unsigned long)sh;
spin_lock_init(&sh->lock);
}
/*

2
include/linux/if_shaper.h
View File

@ -23,7 +23,7 @@ struct shaper
__u32 shapeclock;
unsigned long recovery; /* Time we can next clock a packet out on
an empty queue */
struct semaphore sem;
spinlock_t lock;
struct net_device_stats stats;
struct net_device *dev;
int (*hard_start_xmit) (struct sk_buff *skb,