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[SUNGEM]: Fix suspend regression due to NAPI changes.

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Commit bea3348e (the NAPI changes) made sungem unconditionally enable
NAPI when resuming and unconditionally disable when suspending, this,
however, makes napi_disable() hang when suspending when the interface
was taken down before suspend because taking the interface down also
disables NAPI. This patch makes touching the napi struct in
suspend/resume code paths depend on having the interface up, thereby
fixing the hang on suspend.

The patch also moves the napi_disable() in gem_close() under the lock so
that the NAPI state is always modified atomically together with the
"opened" variable.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2007-11-12 18:09:25 -08:00 committed by David S. Miller
parent cd228d5458
commit 62768e28d6
1 changed files with 5 additions and 6 deletions
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11
drivers/net/sungem.c
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@ -2333,10 +2333,10 @@ static int gem_close(struct net_device *dev)
{
struct gem *gp = dev->priv;
napi_disable(&gp->napi);
mutex_lock(&gp->pm_mutex);
napi_disable(&gp->napi);
gp->opened = 0;
if (!gp->asleep)
gem_do_stop(dev, 0);
@ -2355,8 +2355,6 @@ static int gem_suspend(struct pci_dev *pdev, pm_message_t state)
mutex_lock(&gp->pm_mutex);
napi_disable(&gp->napi);
printk(KERN_INFO "%s: suspending, WakeOnLan %s\n",
dev->name,
(gp->wake_on_lan && gp->opened) ? "enabled" : "disabled");
@ -2370,6 +2368,8 @@ static int gem_suspend(struct pci_dev *pdev, pm_message_t state)
/* If the driver is opened, we stop the MAC */
if (gp->opened) {
napi_disable(&gp->napi);
/* Stop traffic, mark us closed */
netif_device_detach(dev);
@ -2460,6 +2460,7 @@ 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);
@ -2479,8 +2480,6 @@ static int gem_resume(struct pci_dev *pdev)
spin_unlock(&gp->tx_lock);
spin_unlock_irqrestore(&gp->lock, flags);
napi_enable(&gp->napi);
mutex_unlock(&gp->pm_mutex);
return 0;