From 49d85c502ec5e6d5998c1a04394c5b24e8f7d32d Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 18 Jan 2008 04:21:39 -0800 Subject: [NET]: Fix interrupt semaphore corruption in Intel drivers. Several of the Intel ethernet drivers keep an atomic counter used to manage when to actually hit the hardware with a disable or an enable. The way the net_rx_work() breakout logic works during a pending napi_disable() is that it simply unschedules the poll even if it still has work. This can potentially leave interrupts disabled, but that is OK because all of the drivers are about to disable interrupts anyways in all such code paths that do a napi_disable(). Unfortunately, this trips up the semaphore used here in the Intel drivers. If you hit this case, when you try to bring the interface back up it won't enable interrupts. A reload of the driver module fixes it of course. So what we do is make sure all the sequences now go: napi_disable(); atomic_set(&adapter->irq_sem, 0); *_irq_disable(); which makes sure the counter is always in the correct state. Reported by Robert Olsson. Signed-off-by: David S. Miller --- drivers/net/e1000e/netdev.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/net/e1000e') diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c index 2ab3bfbb8a6..9cc5a6b01bc 100644 --- a/drivers/net/e1000e/netdev.c +++ b/drivers/net/e1000e/netdev.c @@ -2183,6 +2183,7 @@ void e1000e_down(struct e1000_adapter *adapter) msleep(10); napi_disable(&adapter->napi); + atomic_set(&adapter->irq_sem, 0); e1000_irq_disable(adapter); del_timer_sync(&adapter->watchdog_timer); -- cgit v1.2.3-70-g09d2