Re: [crash, bisected] Kernel BUG at ffffffff8079afb1(__netif_schedule())

From: David Miller
Date: Mon Jul 21 2008 - 11:07:39 EST

From: Ingo Molnar <mingo@xxxxxxx>
Date: Mon, 21 Jul 2008 15:30:59 +0200

> -tip testing on latest -git (v2.6.26-5253-g14b395e) triggered the
> following boot crash on a Core2Duo 64-bit testsystem:
> ADDRCONF(NETDEV_UP): eth0: link is not ready
> eth0: Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX

Should be fixed by:

e1000: resolve tx multiqueue bug

With the recent changes to tx mutiqueue, e1000 was not calling
netif_start_queue() before calling netif_wake_queue().
This causes an oops during loading of the driver.

(Based on commit d55b53fff0c2ddb639dca04c3f5a0854f292d982
("igb/ixgbe/e1000e: resolve tx multiqueue bug").)

Signed-off-by: Ben Hutchings <bhutchings@xxxxxxxxxxxxxx>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index f8df8bd..cf12b05 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -1472,6 +1472,8 @@ e1000_open(struct net_device *netdev)


+ netif_start_queue(netdev);
/* fire a link status change interrupt to start the watchdog */
E1000_WRITE_REG(&adapter->hw, ICS, E1000_ICS_LSC);

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