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
According to the PoP, subchannels are only considered operational if they are enabled _and_ the device number is valid. With the current checks being enabled _or_ having a valid device number was sufficient. This caused qemu to allow IO on subchannels that were not enabled. Fix the checks to require both bits to be set. Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>