From: Hannes Reinecke <hare@suse.de>

If persistent controller connections are present they should be
preferred even if no --device option is given on the commandline.
To avoid selecting a temporary non-persistent controller the
'kato' attribute is checked; any controller which does not have
this attribute or for which the attribute is '0' will be skipped.

Why?

You also need a fallback in case kato is not exposed in prior
kernels.

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