[S390] dasd: fix fixpoint divide exception in define_extent

If an IO request is build on an alias device without prefix enabled
we try to calculate with zero data from the alias device. This
triggers a BUG statement with fixpoint divide exception.
This case is very unlikely and can only happen if the pathgroup is
lost with an alias device already in use.
Prevent the alias device from being used in this case.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 11 insertions, 1 deletions

diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index c388eda1e2b1..553b3c5abb0a 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -705,6 +705,16 @@ struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *base_device)
         if (lcu->pav == NO_PAV ||
             lcu->flags & (NEED_UAC_UPDATE | UPDATE_PENDING))
                 return NULL;
+        if (unlikely(!(private->features.feature[8] & 0x01))) {
+                /*
+                 * PAV enabled but prefix not, very unlikely
+                 * seems to be a lost pathgroup
+                 * use base device to do IO
+                 */
+                DBF_DEV_EVENT(DBF_ERR, base_device, "%s",
+                              "Prefix not enabled with PAV enabled\n");
+                return NULL;
+        }
 
         spin_lock_irqsave(&lcu->lock, flags);
         alias_device = group->next;
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 763f1bd9605a..bbcd5e9206ee 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2397,7 +2397,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
                                            sizeof(struct PFX_eckd_data));
         } else {
                 if (define_extent(ccw++, cqr->data, first_trk,
-                                  last_trk, cmd, startdev) == -EAGAIN) {
+                                  last_trk, cmd, basedev) == -EAGAIN) {
                         /* Clock not in sync and XRC is enabled.
                          * Try again later.
                          */