From: Ursula Braun <braunu@de.ibm.com>
Date: Sun, 15 Jul 2007 02:03:41 +0000 (-0700)
Subject: [AF_IUCV]: Avoid deadlock between iucv_path_connect and tasklet.
X-Git-Tag: v2.6.23-rc1~1054^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13fdc9a74df0fec70f421c6891e184ed8c3b9088;p=pandora-kernel.git

[AF_IUCV]: Avoid deadlock between iucv_path_connect and tasklet.

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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