[S390] cio: observe chpid valid flag

Check validity flag of CHPID description data before continuing with
channel-path initialization.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 6e04521accd8..8a5839147f8a 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -339,6 +339,10 @@ int chp_new(struct chp_id chpid)
         ret = chsc_determine_channel_path_description(chpid, &chp->desc);
         if (ret)
                 goto out_free;
+        if ((chp->desc.flags & 0x80) == 0) {
+                ret = -ENODEV;
+                goto out_free;
+        }
         /* Get channel-measurement characteristics. */
         if (css_characteristics_avail && css_chsc_characteristics.scmc
             && css_chsc_characteristics.secm) {