From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Fri, 11 Sep 2009 08:28:20 +0000 (+0200)
Subject: [S390] cio: ensure to hold a reference for deferred deregistration
X-Git-Tag: v2.6.32-rc1~734^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be7a2ddce66991c05a1c6ad19790289591e53547;p=pandora-kernel.git

[S390] cio: ensure to hold a reference for deferred deregistration

Ensure to always hold an extra device reference for scheduling a
subchannel deregistration, by moving the get_device to
ccw_device_schedule_sch_unregister. This fixes an use after free
error in ccw_device_call_sch_unregister where put_device was called
on an already freed device structure.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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