netdev - Re: [PATCH] Fix hang on IBM Token Ring PCMCIA card ejection

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Message-ID: <4642586D.4070300@garzik.org>
Date:	Wed, 09 May 2007 19:25:33 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Paul Walmsley <paul@...yaka.com>
CC:	mikep@...uxtr.net, netdev@...r.kernel.org, linux-tr@...uxtr.net
Subject: Re: [PATCH] Fix hang on IBM Token Ring PCMCIA card ejection

Paul Walmsley wrote:
> Ejecting a PCMCIA IBM Token Ring card that has not had its dev->open()
> called will reliably trigger an uninitialized spinlock oops when
> spinlock debugging is enabled. The system then hangs, occasionally
> softlockup oopsing.  Apparently ibmtr.c:tok_interrupt() doesn't expect
> to be called before tok_open(), but tok_interrupt() gets called anyway
> when the card is ejected.  So, set an already-existing flag which
> causes tok_interrupt() to bail out early upon card ejection. Tested by
> inserting and removing the PCMCIA card several times.
> 
> Patch against 2.6.21-rc6.
> 
> 
> Signed-off-by: Paul Walmsley <paul@...yaka.com>
> 
> ---
>  ibmtr_cs.c |   14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)

applied


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