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List:       linux-s390
Subject:    Re: [patch 2/3] s390: iucv - avoid deadlock between
From:       David Miller <davem () davemloft ! net>
Date:       2007-07-15 2:03:50
Message-ID: 20070714.190350.95894917.davem () davemloft ! net
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From: Ursula Braun <braunu@de.ibm.com>
Date: Fri, 13 Jul 2007 10:50:55 +0200

> From: Ursula Braun <braunu@de.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@de.ibm.com>
> Acked-by: Frank Pavlic <fpavlic@de.ibm.com>

Applied.
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