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H A D | dasd_eckd.c | 9e34c8ba Thu Oct 08 08:13:33 CDT 2020 Jan Höppner <hoeppner@linux.ibm.com> s390/dasd: Fix operational path inconsistency
During online processing and setting up a DASD device, the configuration data for operational paths is read and validated two times (dasd_eckd_read_conf()). The first time to provide information that are necessary for the LCU setup. A second time after the LCU setup as a device might report different configuration data then.
When the configuration setup for each operational path is being validated, an initial call to dasd_eckd_clear_conf_data() is issued. This call wipes all previously available configuration data and path information for each path. However, the operational path mask is not updated during this process.
As a result, the stored operational path mask might no longer correspond to the operational paths mask reported by the CIO layer, as several paths might be gone between the two dasd_eckd_read_conf() calls.
This inconsistency leads to more severe issues in later path handling changes. Fix this by removing the channel paths from the operational path mask during the dasd_eckd_clear_conf_data() call.
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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