tree 8182caac93576fdbe0e2e0921bf46b188854863a
parent 5314af693da5149c2361d290bb184cf18ee21cdd
author Stefan Weinhuber <wein@de.ibm.com> 1253653132 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1253653126 +0200

[S390] dasd: tolerate devices that have no feature codes

The DASD device driver reads the feature codes of a device during
device initialization. These codes are later used to determine the
availability of advanced features like PAV or High Performance FICON.
Some very old devices do not support the command to read feature
codes and the initialization routine fails.
As the feature codes are not necessary for basic DASD operations, we
can support such devices by just ignoring missing feature codes.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>