From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Mon, 7 Dec 2009 11:51:35 +0000 (+0100)
Subject: [S390] cio: fix quiesce state
X-Git-Tag: v2.6.33-rc1~349^2~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56e6b796fe9b99287648fc5686aae00106b37bab;p=pandora-kernel.git

[S390] cio: fix quiesce state

DEV_STATE_QUIESCE is used to stop all IO on a busy subchannel.
This patch fixes the following problems related to the QUIESCE
state:

* Fix a potential race condition which could occur when the
resulting state was DEV_STATE_OFFLINE.

* Add missing locking around cio_disable_subchannel,
ccw_device_cancel_halt_clear and the cdev's handler.

* Loop until we know for sure that the subchannel is disabled.

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

Reading git-diff-tree failed