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| author | Kulikov Vasiliy <segooon@gmail.com> | 2010-07-09 02:25:22 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-10 19:42:06 -0700 |
| commit | f163530407280485034c836d908b49787a8189bc (patch) | |
| tree | 0f03dbed022025a5f4d78d5e2b84b8656873c138 /drivers/net/82596.c | |
| parent | 344dbf1073d1cea179ed0831547cab2b7ea4ea27 (diff) | |
| download | lwn-f163530407280485034c836d908b49787a8189bc.tar.gz lwn-f163530407280485034c836d908b49787a8189bc.zip | |
82596: do not panic on out of memory
If dev_alloc_skb() failed then free already allocated skbs.
remove_rx_bufs() can be called multiple times, so set rbd->skb to NULL
to avoid double free. remove_rx_bufs() was moved upwards to be seen by
init_rx_bufs().
Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/82596.c')
| -rw-r--r-- | drivers/net/82596.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/drivers/net/82596.c b/drivers/net/82596.c index dd8dc15556cb..73073d0b6894 100644 --- a/drivers/net/82596.c +++ b/drivers/net/82596.c @@ -525,7 +525,21 @@ static irqreturn_t i596_error(int irq, void *dev_id) } #endif -static inline void init_rx_bufs(struct net_device *dev) +static inline void remove_rx_bufs(struct net_device *dev) +{ + struct i596_private *lp = dev->ml_priv; + struct i596_rbd *rbd; + int i; + + for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) { + if (rbd->skb == NULL) + break; + dev_kfree_skb(rbd->skb); + rbd->skb = NULL; + } +} + +static inline int init_rx_bufs(struct net_device *dev) { struct i596_private *lp = dev->ml_priv; int i; @@ -537,8 +551,11 @@ static inline void init_rx_bufs(struct net_device *dev) for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) { struct sk_buff *skb = dev_alloc_skb(PKT_BUF_SZ); - if (skb == NULL) - panic("82596: alloc_skb() failed"); + if (skb == NULL) { + remove_rx_bufs(dev); + return -ENOMEM; + } + skb->dev = dev; rbd->v_next = rbd+1; rbd->b_next = WSWAPrbd(virt_to_bus(rbd+1)); @@ -574,19 +591,8 @@ static inline void init_rx_bufs(struct net_device *dev) rfd->v_next = lp->rfds; rfd->b_next = WSWAPrfd(virt_to_bus(lp->rfds)); rfd->cmd = CMD_EOL|CMD_FLEX; -} - -static inline void remove_rx_bufs(struct net_device *dev) -{ - struct i596_private *lp = dev->ml_priv; - struct i596_rbd *rbd; - int i; - for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) { - if (rbd->skb == NULL) - break; - dev_kfree_skb(rbd->skb); - } + return 0; } @@ -1013,7 +1019,11 @@ static int i596_open(struct net_device *dev) return -EAGAIN; } #endif - init_rx_bufs(dev); + res = init_rx_bufs(dev); + if (res) { + free_irq(dev->irq, dev); + return res; + } netif_start_queue(dev); |