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| -rw-r--r-- | Documentation/s390/driver-model.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/s390/driver-model.txt b/Documentation/s390/driver-model.txt index 77bf450ec39b..e938c442277d 100644 --- a/Documentation/s390/driver-model.txt +++ b/Documentation/s390/driver-model.txt @@ -18,11 +18,18 @@ devices/ - 0.0.0002/ - 0.1.0000/0.1.1234/ ... + - defunct/ In this example, device 0815 is accessed via subchannel 0 in subchannel set 0, device 4711 via subchannel 1 in subchannel set 0, and subchannel 2 is a non-I/O subchannel. Device 1234 is accessed via subchannel 0 in subchannel set 1. +The subchannel named 'defunct' does not represent any real subchannel on the +system; it is a pseudo subchannel where disconnnected ccw devices are moved to +if they are displaced by another ccw device becoming operational on their +former subchannel. The ccw devices will be moved again to a proper subchannel +if they become operational again on that subchannel. + You should address a ccw device via its bus id (e.g. 0.0.4711); the device can be found under bus/ccw/devices/. |