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[S390] cio: fix ccwgroup online vs. ungroup race condition
authorPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Thu, 25 Dec 2008 12:39:04 +0000 (13:39 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 25 Dec 2008 12:39:06 +0000 (13:39 +0100)
Ensure atomicity of ungroup operation to prevent concurrent ungroup
and online processing which may lead to use-after-release situations.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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