[S390] cio: fix parallel cm_enable processing.
It is now possible to trigger cm_enable processing several times in parallel without causing a kernel panic. Signed-off-by: NMichael Ernst <mernst@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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