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author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2008-12-18 08:23:26 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-12-19 06:48:55 (GMT) |
commit | 1762a29ae5ebdd974eb2ba0c36b56ab6f7a9c16d (patch) | |
tree | d78e6058cf6ba22d92ac593c64c0dcfaa9951577 /drivers/net/ucc_geth.c | |
parent | b3431c647662a3647f3500a12ec85d65e3622759 (diff) | |
download | linux-1762a29ae5ebdd974eb2ba0c36b56ab6f7a9c16d.tar.xz |
ucc_geth: Fix TX watchdog timeout handling
The timeout handling code is currently broken in several ways:
- It calls stop() (which frees all the memory and IRQ), and then
calls startup() (which won't re-request IRQ, neither it will
re-init the Fast UCC structure).
- It calls these routines from the softirq context, which is wrong,
since stop() calls free_irq() (which might sleep) and startup()
allocates things with GFP_KERNEL.
- It won't soft-reset the PHY. We need the PHY reset for at least
MPC8360E-MDS boards with Marvell 88E1111 PHY, the PHY won't recover
from timeouts w/o the reset.
So the patch fixes these problems by implementing the workqueue for the
timeout handling, and there we fully re-open the device via close() and
open() calls. The close/open paths do the right things, and I can see
that the driver actually survive the timeouts.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ucc_geth.c')
-rw-r--r-- | drivers/net/ucc_geth.c | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c index fa25dc1..6ebefe9 100644 --- a/drivers/net/ucc_geth.c +++ b/drivers/net/ucc_geth.c @@ -3355,13 +3355,17 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth) return 0; } -/* ucc_geth_timeout gets called when a packet has not been - * transmitted after a set amount of time. - * For now, assume that clearing out all the structures, and - * starting over will fix the problem. */ -static void ucc_geth_timeout(struct net_device *dev) +static int ucc_geth_close(struct net_device *dev); +static int ucc_geth_open(struct net_device *dev); + +/* Reopen device. This will reset the MAC and PHY. */ +static void ucc_geth_timeout_work(struct work_struct *work) { - struct ucc_geth_private *ugeth = netdev_priv(dev); + struct ucc_geth_private *ugeth; + struct net_device *dev; + + ugeth = container_of(work, struct ucc_geth_private, timeout_work); + dev = ugeth->dev; ugeth_vdbg("%s: IN", __func__); @@ -3370,13 +3374,29 @@ static void ucc_geth_timeout(struct net_device *dev) ugeth_dump_regs(ugeth); if (dev->flags & IFF_UP) { - ucc_geth_stop(ugeth); - ucc_geth_startup(ugeth); + /* + * Must reset MAC *and* PHY. This is done by reopening + * the device. + */ + ucc_geth_close(dev); + ucc_geth_open(dev); } netif_tx_schedule_all(dev); } +/* + * ucc_geth_timeout gets called when a packet has not been + * transmitted after a set amount of time. + */ +static void ucc_geth_timeout(struct net_device *dev) +{ + struct ucc_geth_private *ugeth = netdev_priv(dev); + + netif_carrier_off(dev); + schedule_work(&ugeth->timeout_work); +} + /* This is called by the kernel when a frame is ready for transmission. */ /* It is pointed to by the dev->hard_start_xmit function pointer */ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev) @@ -4027,6 +4047,7 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma dev->hard_start_xmit = ucc_geth_start_xmit; dev->tx_timeout = ucc_geth_timeout; dev->watchdog_timeo = TX_TIMEOUT; + INIT_WORK(&ugeth->timeout_work, ucc_geth_timeout_work); netif_napi_add(dev, &ugeth->napi, ucc_geth_poll, UCC_GETH_DEV_WEIGHT); #ifdef CONFIG_NET_POLL_CONTROLLER dev->poll_controller = ucc_netpoll; |