Subject: Re: 2.6.7-rc3: waiting for eth0 to become free
From: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
To: Erik Tews <erik@debian.franken.de>
Cc: Kernel Mailinglist <linux-kernel@vger.kernel.org>
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	 <1086649443.21227.44.camel@localhost>
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Date: Tue, 08 Jun 2004 08:11:07 +0200
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On Tue, 2004-06-08 at 01:04 +0200, Erik Tews wrote:
> Am Di, den 08.06.2004 schrieb Felipe Alfaro Solana um 0:52:
> > On my laptop, when using a CardBus 3c59x-based NIC, I need to run
> > "cardctl eject" so the system won't freeze when resuming. "cardctl
> > eject" worked fine in 2.6.7-rc2-mm2, even when there were programs with
> > network sockets opened (for example, Evolution mantaining a connection
> > against an IMAP server): the card is ejected (well, not physically),
> > even when there are ESTABLISHED connections.
> > 
> > However, starting with 2.6.7-rc3, "cardctl eject" hangs if a program
> > holds any socket open. After a while the "unregister_netdevice: waiting
> > for eth0 to become free" message starts appearing on the kernel message
> > ring. The only apparent solution is killing that program, ejecting the
> > card from its slot and wait until 3c59x.o usage count reaches zero.
> 
> I have seen similar problems with my prism2 minipci-card. I often unload
> the driver to reset the card, sometimes it hangs during unloading with
> the same message. Would it be possible to add some code to backtrace
> this lock?
> 
> This happens with a lot of recent 2.6 kernels, not always reproduceable.

I can reproduce this consistently with 2.6.7-rc3: launch an ftp session
against a remote server and then try running "cardctl eject". In my
case, it just refuses to unload with an usage count of 1.

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