netdev - Re: [patch 2/3] s390: iucv - avoid deadlock between iucv_path

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Date:	Sat, 14 Jul 2007 19:03:50 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	braunu@...ibm.com
Cc:	netdev@...r.kernel.org, linux-s390@...r.kernel.org,
	fpavlic@...ibm.com
Subject: Re: [patch 2/3] s390: iucv - avoid deadlock between
 iucv_path_connect and tasklet

From: Ursula Braun <braunu@...ibm.com>
Date: Fri, 13 Jul 2007 10:50:55 +0200

> From: Ursula Braun <braunu@...ibm.com>
> 
> An iucv deadlock may occur, where one CPU is spinning on the
> iucv_table_lock for iucv_tasklet_fn(), while another CPU is holding
> the iucv_table_lock for an iucv_path_connect() and is waiting for
> the first CPU in an smp_call_function.
> Solution: replace spin_lock in iucv_tasklet_fn by spin_trylock and
> reschedule tasklet in case of non-granted lock.
> 
> Signed-off-by: Ursula Braun <braunu@...ibm.com>
> Acked-by: Frank Pavlic <fpavlic@...ibm.com>

Applied.
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