linux-kernel - Re: [PATCH 1/2 V2] kaweth: Fix locking to be SMP-safe

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Date:	Tue, 31 Mar 2009 18:01:19 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Oliver Neukum <oliver@...kum.org>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2 V2] kaweth: Fix locking to be SMP-safe

Oliver Neukum wrote:
> Am Dienstag 31 März 2009 20:45:49 schrieb Larry Finger:
>> On an SMP system, the following message is printed. The patch below gets
>> fixes the problem.
> 
> Are you sure it is never called with disabled interrupts?

I think not, but all I really know is that the change from spin_lock() to
spin_lock_irq() makes the errors go away.

I checked a number of drivers to see what their ndo_start_xmit routines do. Most
use spin_lock_irq(), but some do no locking.

I tried removing the locking, but that resulted in a stall even when I bypassed
the faulty router.

Larry
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