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| author | Michal Schmidt <mschmidt@redhat.com> | 2009-04-14 15:16:55 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-04-14 15:16:55 -0700 |
| commit | d119b3927994e3d620d6adb0dd1ea6bf24427875 (patch) | |
| tree | ce1222713dcb3ea7486f0a164a34005ea43bd4aa /drivers/net/skge.c | |
| parent | fc59f9a3bf8096a1f68a8b78ada7a0e0ab9236b2 (diff) | |
| download | linux-d119b3927994e3d620d6adb0dd1ea6bf24427875.tar.gz linux-d119b3927994e3d620d6adb0dd1ea6bf24427875.tar.bz2 linux-d119b3927994e3d620d6adb0dd1ea6bf24427875.zip | |
skge: fix occasional BUG during MTU change
The BUG_ON(skge->tx_ring.to_use != skge->tx_ring.to_clean) in skge_up()
was sometimes observed when setting MTU.
skge_down() disables the TX queue, but then reenables it by mistake via
skge_tx_clean().
Fix it by moving the waking of the queue from skge_tx_clean() to the
other caller. And to make sure start_xmit is not in progress on another
CPU, skge_down() should call netif_tx_disable().
The bug was reported to me by Jiri Jilek whose Debian system sometimes
failed to boot. He tested the patch and the bug did not happen anymore.
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/skge.c')
| -rw-r--r-- | drivers/net/skge.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/skge.c b/drivers/net/skge.c index b8978d4af1b7..c11cdd08ec57 100644 --- a/drivers/net/skge.c +++ b/drivers/net/skge.c @@ -2674,7 +2674,7 @@ static int skge_down(struct net_device *dev) if (netif_msg_ifdown(skge)) printk(KERN_INFO PFX "%s: disabling interface\n", dev->name); - netif_stop_queue(dev); + netif_tx_disable(dev); if (hw->chip_id == CHIP_ID_GENESIS && hw->phy_type == SK_PHY_XMAC) del_timer_sync(&skge->link_timer); @@ -2881,7 +2881,6 @@ static void skge_tx_clean(struct net_device *dev) } skge->tx_ring.to_clean = e; - netif_wake_queue(dev); } static void skge_tx_timeout(struct net_device *dev) @@ -2893,6 +2892,7 @@ static void skge_tx_timeout(struct net_device *dev) skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_STOP); skge_tx_clean(dev); + netif_wake_queue(dev); } static int skge_change_mtu(struct net_device *dev, int new_mtu) |