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Date:	Sat, 28 Apr 2007 23:04:47 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH 1/3] [AF_IUCV/IUCV]: smp_call_function deadlock

From: Frank Pavlic <>
Date: Thu, 19 Apr 2007 11:11:45 +0200

> From: Martin Schwidefsky <>
> From: Heiko Carstens <>
> From: Ursula Braun <>
> Calling smp_call_function can lead to a deadlock if it is called
> from tasklet context. 
> Fixing this deadlock requires to move the smp_call_function from the
> tasklet context to a work queue. To do that queue the path pending
> interrupts to a separate list and move the path cleanup out of
> iucv_path_sever to iucv_path_connect and iucv_path_pending.
> This creates a new requirement for iucv_path_connect: it may not be
> called from tasklet context anymore. 
> Also fixed compile problem for CONFIG_HOTPLUG_CPU=n and
> another one when walking the cpu_online mask. When doing this, 
> we must disable cpu hotplug.
> Signed-off-by: Frank Pavlic <>
> Signed-off-by: Martin Schwidefsky <>

Applied, except I had to kick out the HOTPLUT_CPU ifdef removal
since that was already done by f8a6d97043f9adc25889876b681998b77f543bfa


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