1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index ab3521755588..0be7c15f45c5 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2338,6 +2338,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
         /* Calculate number of blocks/records per track. */
         blksize = block->bp_block;
         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
+        if (blk_per_trk == 0)
+                return ERR_PTR(-EINVAL);
         /* Calculate record id of first and last block. */
         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
         first_offs = sector_div(first_trk, blk_per_trk);
@@ -3211,6 +3213,7 @@ int dasd_eckd_pm_freeze(struct dasd_device *device)
 int dasd_eckd_restore_device(struct dasd_device *device)
 {
         struct dasd_eckd_private *private;
+        struct dasd_eckd_characteristics temp_rdc_data;
         int is_known, rc;
         struct dasd_uid temp_uid;
 
@@ -3245,15 +3248,17 @@ int dasd_eckd_restore_device(struct dasd_device *device)
         dasd_eckd_read_features(device);
 
         /* Read Device Characteristics */
-        memset(&private->rdc_data, 0, sizeof(private->rdc_data));
         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
-                                         &private->rdc_data, 64);
+                                         &temp_rdc_data, 64);
         if (rc) {
                 DBF_EVENT(DBF_WARNING,
                           "Read device characteristics failed, rc=%d for "
                           "device: %s", rc, dev_name(&device->cdev->dev));
                 goto out_err;
         }
+        spin_lock(get_ccwdev_lock(device->cdev));
+        memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
+        spin_unlock(get_ccwdev_lock(device->cdev));
 
         /* add device to alias management */
         dasd_alias_add_device(device);