linux-kernel - Re: [crash, bisected] Kernel BUG at ffffffff8079afb1 (__netif

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Message-Id: <20080721.080727.10939720.davem@davemloft.net>
Date:	Mon, 21 Jul 2008 08:07:27 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [crash, bisected] Kernel BUG at ffffffff8079afb1
 (__netif_schedule())

From: Ingo Molnar <mingo@...e.hu>
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@...arflare.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>

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)
 
 	e1000_irq_enable(adapter);
 
+	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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