[S390] memory hotplug: only unassign assigned increments

Make sure that only assigned storage increments are unassigned when
attaching a storage element.

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

diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
index be55fb2..837e010 100644 (file)
--- a/drivers/s390/char/sclp_cmd.c
+++ b/drivers/s390/char/sclp_cmd.c
@@ -383,8 +383,10 @@ static int sclp_attach_storage(u8 id)
        switch (sccb->header.response_code) {
        case 0x0020:
                set_bit(id, sclp_storage_ids);
-               for (i = 0; i < sccb->assigned; i++)
-                       sclp_unassign_storage(sccb->entries[i] >> 16);
+               for (i = 0; i < sccb->assigned; i++) {
+                       if (sccb->entries[i])
+                               sclp_unassign_storage(sccb->entries[i] >> 16);
+               }
                break;
        default:
                rc = -EIO;