From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Thu, 25 Dec 2008 12:39:08 +0000 (+0100)
Subject: [S390] cio: Only register ccw_device for registered subchannel.
X-Git-Tag: v2.6.29-rc1~584^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5fb6b8544d9ccd2ed478af777f9e99e342eb8886;p=pandora-kernel.git

[S390] cio: Only register ccw_device for registered subchannel.

There is a race between io_subchannel_register() and
io_subchannel_sch_event() which may cause a subchannel to be
unregistered because it is no longer operational before
io_subchannel_register() had run. We need to check whether the
subchannel is still registered before the ccw device can be
registered and just bail out if it is not.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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