netdev - Re: Can someone please try...

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Date:	Wed, 24 Jan 2007 00:43:10 -0500
From:	Pavel Roskin <proski@....org>
To:	Michael Buesch <mb@...sch.de>
Cc:	bcm43xx-dev@...ts.berlios.de, netdev@...r.kernel.org
Subject: Re: Can someone please try...

On Tue, 2007-01-23 at 10:21 +0100, Michael Buesch wrote:
> On Tuesday 23 January 2007 07:14, Pavel Roskin wrote:
> > I have tried the patch, and it doesn't fix the problem.  It's a separate
> > problem.  It happens when bcm43xx_interrupt_handler() is called on a
> > device that has already been removed.
> 
> That shouldn't happen and doesn't for me.
> 
> > It looks like 
> > bcm43xx_wireless_core_stop() should be called from
> > bcm43xx_one_core_detach().
> 
> No, well... . remove_interface should have been called by the stack, no?

It is not.  It's called if I bring the interface down with ifconfig.  If
I remove live interface with "rmmod bcm43xx_d80211",
bcm43xx_one_core_detach() is called first, followed by kernel panic in 
bcm43xx_interrupt_handler().

And that's what I see in the code.  Module removal calls bcm43xx_exit().
It unregisters the ssb driver first.  The ssb layer calls
bcm43xx_remove(), which calls bcm43xx_one_core_detach() before doing
anything with the wireless stack or with interrupts.

I tried to put bcm43xx_one_core_detach() to the end of bcm43xx_remove(),
but the result was the same.  Still, I think the solution lies in that
direction.  We should stop the hardware before dismantling any data
structures.

-- 
Regards,
Pavel Roskin

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