[S390] cio: Rework css driver.

Rework the css driver methods to provide sane callbacks for
subchannels of all types.

As a bonus, this cleans up and simplyfies the machine check
handling for I/O subchannels a lot.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 903e23ae8ed5..fdb164f36109 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -564,6 +564,7 @@ int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
         }
         /* Copy subchannel type from path management control word. */
         sch->st = sch->schib.pmcw.st;
+
         switch (sch->st) {
         case SUBCHANNEL_TYPE_IO:
                 err = cio_validate_io_subchannel(sch);