From 71822faa3bc0af5dbf5e333a2d085f1ed7cd809f Mon Sep 17 00:00:00 2001 From: Ilkka Virta Date: Fri, 6 Feb 2009 22:00:36 -0800 Subject: sungem: Soft lockup in sungem on Netra AC200 when switching interface up From: Ilkka Virta In the lockup situation the driver seems to go off in an eternal storm of interrupts right after calling request_irq(). It doesn't actually do anything interesting in the interrupt handler. Since connecting the link afterwards works, something later in initialization must fix this. Looking at gem_do_start() and gem_open(), it seems that the only thing done while opening the device after the request_irq(), is a call to napi_enable(). I don't know what the ordering requirements are for the initialization, but I boldly tried to move the napi_enable() call inside gem_do_start() before the link state is checked and interrupts subsequently enabled, and it seems to work for me. Doesn't even break anything too obvious... Signed-off-by: David S. Miller --- drivers/net/sungem.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/net/sungem.c') diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c index b17efa9cc530..491876341068 100644 --- a/drivers/net/sungem.c +++ b/drivers/net/sungem.c @@ -2221,6 +2221,8 @@ static int gem_do_start(struct net_device *dev) gp->running = 1; + napi_enable(&gp->napi); + if (gp->lstate == link_up) { netif_carrier_on(gp->dev); gem_set_link_modes(gp); @@ -2238,6 +2240,8 @@ static int gem_do_start(struct net_device *dev) spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); + napi_disable(&gp->napi); + gp->running = 0; gem_reset(gp); gem_clean_rings(gp); @@ -2338,8 +2342,6 @@ static int gem_open(struct net_device *dev) if (!gp->asleep) rc = gem_do_start(dev); gp->opened = (rc == 0); - if (gp->opened) - napi_enable(&gp->napi); mutex_unlock(&gp->pm_mutex); @@ -2476,8 +2478,6 @@ static int gem_resume(struct pci_dev *pdev) /* Re-attach net device */ netif_device_attach(dev); - - napi_enable(&gp->napi); } spin_lock_irqsave(&gp->lock, flags); -- cgit v1.2.3