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A deferred condition code 1 response indicates that I/O was not started
and should be retried. The current QDIO implementation handles a cc1
response as I/O error, resulting in a failed QDIO setup. This can happen
for example when a path verification request arrives at the same time
as QDIO setup I/O is started.
Fix this by retrying the QDIO setup I/O when a cc1 response is received.
Note that since
commit 2297791c92 ("s390/cio: dont unregister subchannel from child-drivers")
commit 5ef1dc40ff ("s390/cio: fix invalid -EBUSY on ccw_device_start")
deferred cc1 responses are much more likely to occur. See the commit
message of the latter for more background information.
Fixes: 2297791c92 ("s390/cio: dont unregister subchannel from child-drivers")
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
607638faf2