From 7731a4ea1bbb7c9336bcdec8ef4050cf08a35268 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Wed, 14 Dec 2005 15:47:46 -0800 Subject: [PATCH] skge: handle out of memory on MTU size changes Changing the MTU size causes the receiver to have to reallocate buffers. If this allocation fails, then we need to return an error, and take the device offline. It can then be brought back up or reconfigured for a smaller MTU. Signed-off-by: Stephen Hemminger Signed-off-by: Jeff Garzik --- drivers/net/skge.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/skge.c b/drivers/net/skge.c index 14bf4cc5b07..96b661b1f6c 100644 --- a/drivers/net/skge.c +++ b/drivers/net/skge.c @@ -2192,6 +2192,7 @@ static int skge_up(struct net_device *dev) kfree(skge->rx_ring.start); free_pci_mem: pci_free_consistent(hw->pdev, skge->mem_size, skge->mem, skge->dma); + skge->mem = NULL; return err; } @@ -2202,6 +2203,9 @@ static int skge_down(struct net_device *dev) struct skge_hw *hw = skge->hw; int port = skge->port; + if (skge->mem == NULL) + return 0; + if (netif_msg_ifdown(skge)) printk(KERN_INFO PFX "%s: disabling interface\n", dev->name); @@ -2258,6 +2262,7 @@ static int skge_down(struct net_device *dev) kfree(skge->rx_ring.start); kfree(skge->tx_ring.start); pci_free_consistent(hw->pdev, skge->mem_size, skge->mem, skge->dma); + skge->mem = NULL; return 0; } @@ -2418,18 +2423,23 @@ static void skge_tx_timeout(struct net_device *dev) static int skge_change_mtu(struct net_device *dev, int new_mtu) { - int err = 0; - int running = netif_running(dev); + int err; if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU) return -EINVAL; + if (!netif_running(dev)) { + dev->mtu = new_mtu; + return 0; + } + + skge_down(dev); - if (running) - skge_down(dev); dev->mtu = new_mtu; - if (running) - skge_up(dev); + + err = skge_up(dev); + if (err) + dev_close(dev); return err; } -- cgit v1.2.3