diff options
| author | Stephen Hemminger <shemminger@osdl.org> | 2006-10-26 15:46:50 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-02 21:22:32 -0800 |
| commit | 93ec2c723e3f8a216dde2899aeb85c648672bc6b (patch) | |
| tree | a70a10812c2340edfce0d1010175535aa344d1c9 /net/core | |
| parent | a1bcfacd0577ff477e934731d4ceb3d26eab947d (diff) | |
| download | kernel_samsung_smdk4412-93ec2c723e3f8a216dde2899aeb85c648672bc6b.zip kernel_samsung_smdk4412-93ec2c723e3f8a216dde2899aeb85c648672bc6b.tar.gz kernel_samsung_smdk4412-93ec2c723e3f8a216dde2899aeb85c648672bc6b.tar.bz2 | |
netpoll info leak
After looking harder, Steve noticed that the netpoll
beast leaked a little every time it shutdown for a nap.
Not a big leak, but a nuisance kind of thing.
He took out his refcount duct tape and patched the
leak. It was overkill since there was already other
locking in that area, but it looked clean and wouldn't
attract fleas.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/netpoll.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 4de62f1..c66df2f 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -658,8 +658,11 @@ int netpoll_setup(struct netpoll *np) npinfo->tries = MAX_RETRIES; spin_lock_init(&npinfo->rx_lock); skb_queue_head_init(&npinfo->arp_tx); - } else + atomic_set(&npinfo->refcnt, 1); + } else { npinfo = ndev->npinfo; + atomic_inc(&npinfo->refcnt); + } if (!ndev->poll_controller) { printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", @@ -766,12 +769,22 @@ void netpoll_cleanup(struct netpoll *np) if (np->dev) { npinfo = np->dev->npinfo; - if (npinfo && npinfo->rx_np == np) { - spin_lock_irqsave(&npinfo->rx_lock, flags); - npinfo->rx_np = NULL; - npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; - spin_unlock_irqrestore(&npinfo->rx_lock, flags); + if (npinfo) { + if (npinfo->rx_np == np) { + spin_lock_irqsave(&npinfo->rx_lock, flags); + npinfo->rx_np = NULL; + npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; + spin_unlock_irqrestore(&npinfo->rx_lock, flags); + } + + np->dev->npinfo = NULL; + if (atomic_dec_and_test(&npinfo->refcnt)) { + skb_queue_purge(&npinfo->arp_tx); + + kfree(npinfo); + } } + dev_put(np->dev); } |