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rapidio: add handling of redundant routes
Detects RIO link to the already enumerated device and properly sets links between device objects. Changes to the enumeration/discovery logic: 1. Use Master Enable bit to signal end of the enumeration - agents may start their discovery process as soon as they see this bit set (Component Tag register was used before for this purpose). 2. Enumerator sets Component Tag (!= 0) immediately during device setup. This allows to identify the device if the redundant route exists in a RIO system. Signed-off-by: Alexandre Bounine <[email protected]> Cc: Thomas Moll <[email protected]> Cc: Matt Porter <[email protected]> Cc: Li Yang <[email protected]> Cc: Kumar Gala <[email protected]> Cc: Micha Nelissen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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